A20-OLINUXINO-LIME and A20-OLINUXINO-LIME-4GB
Contents
1. G11 PC3 SATA PWR EN L22 C20 PC21 PC24 C22 C23 Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc Pin 29 is used to control the power supply available at the SV SATA PWR by default c UU N N U 0 C Hd N 0 v HB 70 A N HG U 37 Ls g 8 o 13 14 15 2 23 24 26 38 35 36 38 39 49 NIN Page 36 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 9 2 GPIO 2 General Purpose Input Output 40pin connector The GPIO pins are led out on a separate 40 connecter They allow the user to attach additional hardware check readings or perform hardware debug The GPIO 2 connector numbers are printed at the bottom of the board for your convenience GPIO 2 connector 3 Ex pes te A295 _ jus Lr s A20 PE2 D23 B20 PE3 D22 A19 C23 x p jus pe s m e h 2 e 39 h o as e gt o Signals2. 1 6 Edo u USB ENSS C ixl 5 Iset 4800 Rs n37 2m REL 43k AX LI 2 8 Iset H 2 amp REA 4 The USB_OTG features Low Loss Power Distribution Switch SY6280 which protects the board in case the devices you have plugged to the USB_OTG attempt to draw more current than 523mA combined The maximum current available on the 5V USB is exactly 523mA The SY6280 responsible for the USB is enabled by USBO DRV processor pin C12 port B9 Page 27 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual thus the USB_OTG is also controlled by the same signal Please note that the USBO DRV pin C12 port B9 is multiplexed with the I2S_DO1 signal If you are going to use the I2S audio interface then you would probably need to change the position of the SMT jumper PB9 PH7_USB which by default connects USB_OTG to the PB9 This operation would require cutting between the pads of the default position with a very sharp object and then soldering the pads of the other position together Doing so you would be able to use both the USB_OTG via port PH7 this time and the 125 interface Additionally PB9 PH7_GPIO jumper controls which of the two ports PB9 or PH7 should be lead out to pin 9 of GPIO3 connector for easier access By default this jumper is in PH7_GPIO position and is lead to
3. Nu NS H02 X3HTI70 MH 89 lata A20 OLINUXINO LIME and A20 OLINUXINO LIME 4GB Open source sinole board Android Linux mini computer USER S MANUAL Revision I May 2015 Designed by OLIMEX Ltd 2015 lead free All boards produced by Olimex LTD are ROHS compliant OLIMEXO 2015 A20 OLinuXino LIME user s manual DISCLAIMER 2015 Olimex Ltd OlimexG logo and combinations thereof are registered trademarks of Olimex Ltd Other product names may be trademarks of others and the rights belong to their respective owners The information in this document is provided in connection with Olimex products No license express or implied or otherwise to any intellectual property right is granted by this document or in connection with the sale of Olimex products This work is licensed under the Creative Commons Attribution ShareAlike 3 0 Unported License To view a copy of this license visit http www creativecommons org licenses by sa 3 0 This hardware design by Olimex LTD is licensed under a Creative Commons Attribution ShareAlike 3 0 Unported License The software is released under GPL It is possible that the pictures in this manual differ from the latest revision of the board The product described in this document is subject to continuous development and improvements particulars of the product and its use contained in this document are given by OLIMEX in good faith However all warranti
4. 44 8 1 Document revisio a Eres V aa co de ca De 44 8 2 Board revisiQTuuF 2 2 2 92202 2002 0 2222022 02 002020 6 292 0 902 00020 08901 022 44 8 3 Useful web links and purchase COCG ssssssssssssssssssssssssssssssssssssssssscssssscsccssssssssscscsses 45 Page 4 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 1 OVERVIEW 1 Introduction to the chapter Thank you for choosing this OLinuXino single board computer from Olimex This document provides a user s guide for the Olimex A20 LIME board As an overview this chapter gives the scope of this document and lists the board s features The document s organization is then detailed The A20 OLinuXino LIME development board enables code development of applications running on the A20 microcontroller manufactured by Allwinner Technology from China OLinuXino is an open source open hardware project and all documentation is available to the customer 1 1 Features The board has the following set of features Allwinner A20 dual core Cortex A7 processor each core typically running at 1GHz and dual core Mali 400 GPU 512MB DDR3 RAM memory 4GB NAND FLASH memory available only on the 4GB version of the board Android already loaded on the NAND available only on the 4GB version of the board SATA connector with 5V SATA power jack e Capable of FullHD 108
5. 5 2 Clocks 25 MHz quartz crystal Q1 is connected to pins X1 and X2 of the RTL8201CP Ethernet controller 32 768 Hz RTC quartz crystal Q2 is found at pins F1 and F2 of the A20 microcontroller 24 MHz quartz crystal Q3 is found at pins N22 and N23 of the A20 microcontroller 5 3 Power supply circuit The power supply is handled mainly by AXP209 power management system an Allwinner chip that goes together with the A20 processor It is mounted on the board but since it is relatively hard to find we also sell it separately The power supply circuit of A20 OLinuXino LIME requires input supply of 5V The minimum wattage is 2 5W and this threshold may raise if using a lot of devices on the USB HOST via external hub a lot of GPIOs or you have a display connected to the LCD CON or a hard disk powered from the 5 SATA connector If a discharged Li Po battery is connected to the respective connector the power consumption of the whole LIME board might rise enormously since the built in battery charger would attempt to recharge it For more info on how to power the board refer to chapter 2 3 Powering the board Page 24 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 6 CONNECTORS AND PINOUT 6 Introduction to the chapter In this chapter are presented the connectors that can be found on the board all together with their pinout and notes about them Jumpers functions are described Notes and info on specific periphe
6. Changing this jumper also changes PC3 the availability of PC3 and PB8 at GPIO 1 pin 29 and GPIO 3 pin 16 Please note that if you change the position of the jumper from PC3 to PB8 then you might block one of the processor pins responsible for I2S and AC97 audio output 7 PB9 PH7_USB PB9 PH7_GPIO Controls which processor pin should be used for the USB OTG By default the USB OTG uses processor pin C12 which is port PB9 The same pin port is used for I2S audio In case you want to access the I2S capabilities of the board you would need to change the default position PB9 PH7 GPIO jumper controls which of the two ports PB9 or PH7 should be lead out to pin 9 of GPIO3 connector for easier access Changing this jumper also changes 3 PHY the signal available at GPIO 3 connector s pin 9 By default this jumper is in PH7_GPIO position and PH7 is lead to pin 9 of GPIO3 Page 40 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 12 Additional hardware components The components below are mounted on OLinuXino but are not discussed above They are listed here for completeness Reset button used to reset the board Power button used to reset the board Recovery button used to reset the board 512MB 1 4Gb 256M x 16 bit DDR3 SDRAM the exact memory used currently in the board is SAMSUNG K4B4G1646D BCKO The DDR3 memory part name in the schematic might be outdated We have used a number of diffe
7. 10000000 1x1 and 7x0 Q How do I write the Linux image to a micro SD card to use with my A20 board A To write a Linux image to an SD card under Windows we use Win32 Disk Imager Download Win32 Disk Imager software Insert card Start program Select file Click write To write a Linux image to an SD card under Linux For instance an image with the file name of debian 2g img would be downloaded to the microSD card connected to a Linux machine using one of the following commands dd bs 4M oflag sync if debian 2g img of dev sdX Or cp debian 2g img dev sdX where X is the microSD card Page 46 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual The tips above can also be used to prepare a microSD card with an Android image suitable for a microSD card Q How to detect and enable the Ethernet controller if it is disabled by default A You can enable it by following these two steps 1 To check under what name the LAN is associated write ifconfig a 2 If for example it is under ethO name then write dhclient ethO This should enable the Ethernet and then SSH would also be available You can also enable auto detection of Ethernet on power up by removing the comment auto in etc network interfaces in the Linux image Q How to install Android on an SD card A First download one of the official Android images which might be found in the Android section above Make sure that the download l
8. LIME user s manual 2 7 Connecting and calibrating a display One of the ways to interact with the board is via an external display with or without touchscreen component If you want to use a display for video output from the LIME board the best way is to use the LCD CON row of pins The step between the pins of the connector is the smaller one only 0 05 compared to 0 1 of bigger boards Newer displays made by Olimex have both 0 1 and 0 05 step connectors Going for an LCD output you would also need need and a cable to attach the display to the board The cable is sold separately The cable used for connection depends on the specific board you are using and more specifically it depends on the pitch of the LCD connector of the board We have two cables both 40 pins ones but one for the bigger pitch 0 1 and the other for the smaller one 0 05 Each of the displays listed in the table further below has two connectors suitable for both cables CABLE IDC40 6cm 6cm long cable suitable for 0 1 step connectors Product page CABLE 40 40 10CM 10cm long cable suitable for 0 05 step connectors Product page The displays recommended for the board at the moment of writing might be found in the following table Display name Size of Native Official Official Link to product display resolution Debian image Android image page in inches in pixels support support LCD OlinuXino 4 3TS 4 3 480
9. OLinuXino LIME user s manual If the board has entered power down state you can bring it back without restart using the PWR BUT The PWR_BUT is also used to start the board when powered from a Li Po battery the battery connector Sometimes when starting Android it is possible the board to enter battery save mode even before booting fully Especially if you have turned off the board without quick boot mode enabled In this case you should press the PWR button for at least 5 seconds which would allow the board to start For the European customers we sell two power supply adapters please check chapter 2 2 We also sell USB OTG to USB type A cables if you lack such The default username password combination for the default Linux image on the SD card if purchased is root olimex Note that it is normal that when the board is powered some integrated circuits might appear hotter than others This is perfectly normal for some chips for instance voltage regulators and the main processor 2 4 Button functions The bellow three buttons usually are supported under both Android and Debian PWR used to perform software turn off software turn on used to turn on board when powered by battery has to be held down for at least 5 seconds to perform each action RESET used for hardware reset of the board RECOVERY used to wake up the board from sleep It is recommended to always make a soft turn off of the board If that is n
10. be found at https www olimex com wiki GTC Warranty for future reference Page 49 of 49
11. cases you can always use the serial cable USB SERIAL CABLE F as a reliable way to establish connection to the board 2 5 1 Serial connection at UARTO The default and recommended way to communicate with the board is using the serial connection available at UARTO connector You would probably need an USB lt gt SERIAL cable for such a connection Even if you intend to use HDMI or LCD it is a good idea to have it as a basis the video output is not always reliable and if you set wrong display settings you would be unable to recover the software without an alternative connection We distribute a ready to use cable Even if you already have such a cable or you decide to purchase it elsewhere it is advisable to check this product page for a reference Product page If you decide to make your own cable you would need to consider that the levels at board s UARTO are in CMOS level 3 3V and you would need a convertor to bring them to the TTL level of your computer or cable That is true for the RX and TX also The cable probably needs drivers after successful driver installation a COM port device would show up in the hardware manager of your computer Then you would need to connect the serial cable wires to the board as follows RX line to UART1 TX pin TX line to VART1 RX pin GND to GND The last pin of UART1 connector is named 3 3V and it can be used to power the board if you have other ways of power the board leave 3 3V pin unconnected Be ca
12. remarkable stand alone functionality The strong points of these boards are the processor speed the small form factor and the low price to productivity ratio Customers have full access to the technical documentation of the board The software is released under General Purpose License and the board is considered open hardware all schematics and board design files are available to the customer under the Creative Commons Attribution ShareAlike 3 0 Unported License 1 3 Board variants There are two major board variants named A20 OLinuXino LIME and A20 OLinuXino LIME 4GB The 4GB version has a built in NAND memory that allows the storage of an operating system without the need of a SD card The 4GB version comes with already programmed Android image There is a more expensive board variant called A20 OLinuXino LIME2 it looks similar to A20 OLinuXino LIME but there are four major differences 1 LIME2 has double the amount of DDR3 RAM memory 1GB vs 512MB 2 LIME2 has a native GbE interface 1000BASE T vs 100BASE TX 3 LIME2 has a different CON layout 4 LIME2 is more expensive The A10 OLinuXino LIME and A10 OLinuXino LIME 4GB boards are almost identical to respectively A20 OLinuXino LIME and A20 OLinuXino LIME 4GB with the only difference being the processor mounted This brings different processor speed and productivity The A10 has a single Cortex A8 core The A20 has a dual core Cortex A7 This makes the A20 boards more
13. similarity 2 3 Powering the board There are three possible ways of powering A20 OLinuXino LIME via external supply providing 5V DC at the power jack from 5V USB port via USB connector or from 3 7V Li Po battery via the LIPO BAT Note that the board might consume up to 650mA of current at 5V when there are no peripherals connected to the USB hosts Make sure your power supply is able to provide at least 1A before Depending on your preferred way of powering you might need additional hardware Important Not all USB ports would be able to provide enough power for the board Try using another USB port USB hub or a cable of higher quality If you have an LCD display connected to the board or external 2 5 hard disk then the USB will NOT be sufficient source of power The best practice is to never count on the mini USB OTG as a single source of power for the board The preferred way of powering the board is via the PWR jack with 5V DC This would make the board fully powered and able to power all the peripherals connected to it Note that when powering the board from the USB the current provided might be insufficient to also power a bigger LCD connected to the LCD con However this power option is capable of driving the board when using external display connected to the HDMI connector The typical consumption of A20 OLinuXino LIME is between 400mA and 750mA depending the current load Page 10 of 49 OLIMEXO 2015 A20
14. which might require a mouse Q How to generate boot able SD card Debian Linux image for A20 OLinuXino LIME A Build instructions and required files for the latest Debian images GitHub location Note that Linux Sunxi Kernel is a work in progress this means you can try the current stage sunxi branch but if something is broken and doesn t work just revert to the git tags we give in the blog and they would work for sure Sunxi u boot loader the linux sunxi git page contains a lot of sources for all Olimex Allwinner boards Q Is it possible to boot Debian from NAND Do you provide such image A It is possible bu we don t provide such image There are people who were successful in booting Debian from the NAND however Make sure to check on the forum Make sure to check the number of very good and optimized A20 OLinuXino Debian images by Igor Pecovnik There are also instructions for NAND installation of Debian link to his web site Q How to connect a display and adjust the output resolution A It is explained above in the user s manual For extra reading there is a separate article on the subject wiki article Q How to edit board configurations and definitions in the official Debian Linux A Do you want a custom video resolution output Do you need a different port definition Do you need to change the hardware definitions of the board It is explained above in the manual But you can also visit this wiki article wiki art
15. 0p video playback Native HDMI connector 2xUSB High speed host with power control and current limiter USB OTG with power control and current limiter 100MBit native Ethernet with connector Battery connector with battery charging capabilities LCD row of pins 0 05 step 160 GPIOs on four GPIO rows of pins 0 05 step MicroSD card connector DEBUG UART connector for console debug with USB SERIAL CABLE F GPIO LED Battery charge status LED 5V input power supply noise immune design Power LED 2KB EEPROM for MAC address storage and more 3 BUTTONS with ANDROID functionality RESET button 4 mount holes PCB dimensions 3005x2345 mils 76x59 mm Page 5 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 1 2 Target market and purpose of the board The boards from the OLinuXino family are easy to setup and powerful It is possible to use them in almost any application as a host board They are suitable for embedded programming enthusiasts Linux and Android gadget fans they can just use the board as a media center or fully functional Linux PC for instance and also professionals since its low cost makes it very good solution for application orientated embedded systems The main usage of the board is software embedded development without the urge of understanding perfectly the hardware The LIME boards are a special kind of OLinuXino boards they are as small as possible while maintaining a
16. 2C and SPI under cce oo ba eva o Lo Sosa de eaa sw s CER 18 CHAPTER 3 A20 OLINUXINO LIME BOARD DESCRIPTION 20 Introduction to the Chapter ccccccssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssess 20 Page 3 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 6 CONNECTORS AND 25 6 Introduction to the Chapter csiccsccsssvescsassvcscsasasasccassvasesassvuscsassvasesisavascsasssascoasavascessevcsscavccesvssens 25 6 5 USB HOST coflectOEs eee tees e cene ne se Fon ee Sacs eas n onc een A esca 30 6 6 Peter ETERRERERRTERRREEECREREEREERERCERERRERREERREERRRRRCRPEREREERRENEEM 30 6 7 HDMI COMMC CIO cR 33 6 8 SATA connector and OW EM ERR AN D d DU RR Ra 34 6 9 GPIO CONMCCIONS enciso nen aaeeea anoaiiaeaii abii 35 CHAPTER 7 SCHEMATIC 59 7 Introduction to the Chapter ccccccccccscssssssssssssssssscscscscccscccscccsccssccsscssscssscssscssssssssesssscecsees 42 CHAPTER 8 REVISION HISTORY AND 0 44 8 hitroduction to tlie Chapter iiio iioc ias ea EE HI See VIE E
17. ATA CABLE SET Pay note the two jumpers 5V E SATA and PC3 PB located at the bottom of the board under the HDMI connector The first one 5 E SATA is open by default because the board has software control of the powering for the hard disk If you close 5 SATA there would always be 5V at the 5V SATA PWR connector Which pin does the software control of the SATA powering is determined by the position of the PC3 PB8 jumper By default is used Page 34 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 9 GPIO connectors There are four GPIO ports which are used generally to access unused by the board s peripherals pins However there are exceptions some of the pins might be used to easily peripherals or their levels Three of the GPIO connectors have 40 pins and the last one has 20 pins Note that all GPIO connectors have 0 05 50 mil step between pins Olimex sells a compatible extension cable for these connectors named CABLE 40 40 10CM IMPORTANT the cables and the 0 05 connectors are very fragile if you attempt to disconnect the setup by pulling the cable it might break Furthermore you might bend the board s or the cable s pins Use pliers or other suitable object to disconnect the connectors carefully Most of the pins are already defined in default operating system images Some of them can be used as GPIOs I2C or SPI without much of a problem Information on the software usage of GPIO ports might be
18. D a tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release A20 LIME DEBIAN SD a tested class 10 micro SD card with the latest by the time of leaving Olimex facilities official Debian Linux release A20 OLinuXino LIME UEXT an adapter from 0 05 step connector to 0 1 step one also suitable for LCD adapting LCD OLINUXINO 4 3TS low cost 4 3 LCD display with touchscreen component 480x272 LCD OLINUXINO 7TS low cost 7 LCD display with optional touchscreen component 800x480 LCD OLINUXINO 10TS low cost 10 LCD display with optional touchscreen component 1024x600 LCD OLINUXINO 15 6 low cost 15 6 LCD display 1366x768 LCD OLINUXINO 15 6FHD low cost Full HD 15 6 LCD display 1920x1080 CABLE 40 40 10CM 0 05 step cable for connecting a new display to the board CABLE IDC40 15cm 0 1 step cable for connecting an LCD to A20 OLinuXino LIME2 UEXT SATA HDD 2 5 500GB 5GB 2 5 SATA hard disk SATA CABLE SET cables that allow the connection of a 2 5 hard disk to the board ALUMINIUM HEATSINK 20x20x6MM heatsink radiator for better processor heat dissipation How to purchase You can purchase directly from our online shop or from any of our distributors Note that usually it is faster and cheaper to purchase Olimex products from our distributors List of confirmed Olimex LTD distributors and resellers https www olimex com Distributors Please
19. DMI cable between a TV and the board it is a good idea to have them both connected to the same electrical source to the same utility power socket This might be said for a serial cable connected between a PC and the board s DEBUG port In rare cases different polarity might cause hardware damage to the board Page 8 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 2 2 Requirements In order to set up the A20 OLinuXino LIME optimally one or more additional items may be used They might be generally placed in three categories Required items that are needed in order to achieve minimum functionality Recommended items that is good to have in order to be able to interact with the most important of the features of the board Additional items that provide access to additional features or expand the features of the board Required items USB type A to USB mini cable to connect to a personal computer used for powering the board and uploading new Android image to the NAND memory if your board has 4GB NAND can also be used to access the Linux of the board Input device either a mouse keyboard or touchscreen LCD Output device either HDMI cable native HDMI monitor screen projector or USB SERIAL CABLE F personal computer for Linux and or Android debugging SD card with compatible image if you have the board version with NO additional NAND memory you will need it to use one of the images available Recomm
20. MEXO 2015 A20 OLinuXino LIME user s manual 3 2 Layout bottom view At the bottom are located mainly the buttons and microSD card connector n A18 OLinuxXino Limey POWER BUTTON 236 RESET BUTTON RECOVERY BUTTON MICROSD CARD CONNECTOR Designed by made in Une 2013 WWW OLIMEX COM Page 21 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 4 THE ALLWINNER A20 MICROCONTROLLER 4 Introduction to the chapter In this chapter is located the information about the heart of OLinuXino its microcontroller The information is a modified version of the datasheet provided by its manufacturers 4 1 The processor The features of the A20 processor according to the manufacturer Allwinner BH CPU B ARM Cortex A7 Dual Core m GPU ARM Mali400MP2 Complies with OpenGL ES 2 0 1 1 m VIDEO m HD H 264 2160p video decoding Multi format FHD video decoding including Mpeg1 2 Mpeg4 SP ASP H 263 H 264 VP6 8 AVS jizun Jpeg Mjpeg etc H 264 High Profile 1080p 230fps or 720p 60fps encoding 3840x1080 30fps 3D decoding BD SBS TAB FP supported Complies with RTSP HTTP HLS RTMP MMS streaming media protocols m DISPLAY Supports multi channel HD display Integrated HDMI 1 4 transmitter with HDCP support CPU RGB LVDS LCD interface Supports CVBS YPbPr VGA Integrated TV decoder B CAMERA Integrated parallel 8 bit I F YUV sensor Integrated 24 bit
21. NLY FOR RESPECTIVELY A20 OLINUXINO LIME OR A20 OLINUXINO LIME AGB Page 2 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual Table of Contents DISCLAIMER 2 CHAPTER 1 OVERVIEW Saito Ea Leno oia E 5 1 Introduction to the chapter anssi a a a a aaa 5 AEA e E E E EE AEN IEE S E O EE AOE ET E EE N PETE EE AEREA 5 1 2 Target market and purpose of the board eese eere eere nnne 6 1 3 hi aine 6 L4 Board version used in the L5 0 CoL Dou FoU TV UR RO cuc QUK EN UR PELA 7 CHAPTER 2 SETTING UP THE OLINUXINO 8 2 aiite RR 8 16 2512 Debian 16 28 GPIO under Debian in Loon 17 2 9 I
22. are different Linux images depending whether the HDMI TV works at 50Hz or 60Hz refresh rate If you board runs Android there is a specific option to set the appropriate HDMI output HDMI connector a me 3 pe o o a mae us s pe E L3 mus ju ee us je E s pe E dj s mem ju S Pin 14 of the HDMI is not mandatory In HDMI 1 0 1 3c it is reserved pin in HDMI 1 4 it is optional Page 33 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 8 SATA connector and power The part of the schematic describing the SATA module is shown below DRE c CREME Sm EN 128 ll 18nF SATA RXM_c129 10nF E cam SATA RXP ll 18nF 50 SU E SATA k _ 2 There is 5V_SATA_PWR connector that is CONDDWA2 suitable for powering 5V hard disks trough the 8 board To keep the low form factor we have placed 5 the small JST connector You can make an adapter cable accordingly The other options is to check the SATA CABLE SET 7 that we have available For more information please visit https www olimex com Products Components Cables S
23. brating without the X the user is root su olimex enter the password olimex calibrate the touch screen and reboot the board sudo reboot 2 8 GPIO under Debian You can read data from a given GPIO port The logical ranges are usually as follows OV 1V for LOW or 0 2 4V 3 3V for HIGH or 1 All voltages are measured against ground GND If the input signal is to high you will at least destroy the port The algorithms for writing a value to a GPIO port and reading such a value are pretty similar The usage of GPIO ports follows the algorithm we would use GPIO 49 for demonstration purposes 1 Export GPIO 49 echo 49 gt sys class gpio export Note that you can export GPIOs in range with for i in seq 1 1 230 do echo i sys class gpio export done 2 Set input output GPIO 49 2 1 Set input echo in gt sys class gpio gpio49 ph9 direction 2 2 Set output echo out sys class gpio gpio49 ph9 direction 3 Set value or read value GPIO 49 Page 17 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 3 1 Set value echo 0 gt sys class gpio gpio49 ph9 value echo 1 sys class gpio gpio49 ph9 value 3 2 Read input cat sys class gpio gpio49 ph9 value 4 Unexport GPIO 49 when finished echo 49 sys class gpio unexport A helpful document on A20 s GPIO usage might be found here http www py6zgp com download A20 GPIO pdf the document was created by Dr Guido Pelz Alternatively yo
24. d dhcp as shown below auto ethO inet dhcp For setting a static address please follow the pattern below auto ethO iface ethO inet static address 192 168 1 5 netmask 255 255 255 0 gateway 192 168 1 254 The EEPROM memory may be used to store the MAC address Important In some Debian images it is possible that the Ethernet doesn t get auto detected during boot up This is done on purpose because if there is auto detection enabled and you don t want to use the Ethernet connector or you have forgotten to plug a cable the start up would be greatly delayed This might be problem in the first start up to users counting only on SSH connection You can enable the Ethernet after a successful boot up with ifconfing a dhclient eth as seen after after the ifconfing command Important You can configure static DHCP given IP addresses in etc network interfaces Page 31 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 1234 5678 7 hm The RJ45 connector has a small yellow and a small built in LEDS and they are described below Page 32 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 7 HDMI connector The part of the schematic that describes the HDMI module is shown below IN1 OUT1 IN2 OUT2 IN3 OUT3 IN OUT4 GND GND IN1 OUT1 IN2 OUT2 IN3 OUT3 OUT4 GND GND IN1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 GND GND NACRCLAMP 524P HDMI SWM 19 Note that there
25. ed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc IMPORTANT To use Android with display or resolution different than HDMI and 1024x600 default settings you need to upload new Android image to the board These images are available here https www olimex com wiki A20 OLinuXino LIME using an operating system NAND flash In Debian Linux you would need to start a start a shell script to change the built in the image resolution settings Start it with change display a20 lime sh and follow the instructions Please refer to chapter 2 5 Changing the default image resolution for more information Page 39 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 11 Jumper description Please note that most the jumpers on the board are SMT type If you feel insecure of your soldering cutting technique it is better not to try to adjust the jumpers since it is possible to damage the board Board jumpers SMT SMT SMT MT Either CLOSED or Controls whether the NAND memory OPEN depending module is enabled or disabled whether the board has 4GB If the jumper is closed than the MEMORY MODULE NAND memory is operational Controls which processor pin should be used for SATA power enabling signal By default the SATA powering control uses processor pin L22 which is port PC3
26. ended items External USB hub to split the USB HOST mounted on the board you need that to connect more USB devices External power supply unit 5V DC 5W required for optimal power A10 OLinuXino LIME BOX an aesthetic box specially made for the board that protects it from dust and accidental short circuits USB SERIAL CABLE F for Android Linux debugging on UARTO Additional items include Small heatsink for the processor during long video playbacks the A20 processor might heat up External 2 5 SATA hard disk drive proper cables sold separately Ethernet cable for wired Ethernet Important note on requirements The board works with 2 5 SATA hard disks that can be powered by 5V source from the board For the 3 5 hard disks you would probably need to provide external 12V supply It is a very good idea to have a USB SERIAL CABLE or similar cable since it allows you to 1 Change display output settings for Debian easily 2 Debug the board via any personal computer even if there are problems with the video output Some of the above suggested items can be purchased by Olimex for instance SY0605E reliable power supply adapter 50Hz for EU 5V 1A for A20 OLinuXino LIME SY0605E CHINA cheaper power supply adapter 50Hz for EU 5V 1A for A20 OLinuXino LIME A20 LIME ANDROID SD a tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release Page 9
27. ere would probably occur wrong levels loss of data etc Page 38 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 10 LCD CON 40 connector The LCD CON pins are led out on a separate 40pin connecter for the ease of connecting an LCD We have tested the ability of the board to interact with such a display They allow the user to attach additional hardware check readings or perform hardware debug Important you need additional 40PIN ribbon cable to connect an Olimex display and the LCD CON The LCD connector is suitable for a number of Olimex displays and touchscreen panels with different native resolution the smallest available is the 4 3 one called LCD OLinuXino 4 3TS with native screen resolution of 480x272 through the 7 one named LCD OlinuXino 7TS with 800 480 to the 1024x600 10 1 LCD OLinuXino 10TS a qe jom faa low 7 homs howe ne hom jc pua us how en 2 js a hos ens hos gt joe a Jes 3e howwe oak e 2 Ww pe e hom j ea m ma Signals marked with are multiplex
28. es implied or expressed including but not limited to implied warranties of merchantability or fitness for purpose are excluded This document is intended only to assist the reader in the use of the product OLIMEX Ltd shall not be liable for any loss or damage arising from the use of any information in this document or any error or omission in such information or any incorrect use of the product This evaluation board kit is intended for use for engineering development demonstration or evaluation purposes only and is not considered by OLIMEX to be a finished end product fit for general consumer use Persons handling the product must have electronics training and observe good engineering practice standards As such the goods being provided are not intended to be complete in terms of required design marketing and or manufacturing related protective considerations including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards Olimex currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive Olimex assumes no liability for applications assistance customer product design software performance or infringement of patents or services described herein THERE IS NO WARRANTY FOR THE DESIGN MATERIALS AND THE COMPONENTS USED TO CREATE A20 OLINUXINO LIME AND A20 OLINUXINO LIME 4GB THEY ARE CONSIDERED SUITABLE O
29. f writing the image Choose Page 28 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual method of writing the image and confirm your wish to write the image 8 Wait till upgrade succeeds as shown below PhoenixSuit Firmware PhoenixSuit Caution Please Check the Device Power Before Upgrade Do not Unplug Device during the Upgrade Procedure Page 29 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 5 USB HOST connectors The part of the schematic related to the USB HOST connectors is listed below USB HOSTs USB_HOST4 4 U10 576280 L7 FB0805 600R 2R C118 C117 1Q0uF 6 3U use a 100nF 50 U11 576280 L8 USB HOST2 FB 805 688R 2A LEANN FB8805 600R 2 2126 jes 1 There two USB host connector featured on the board They are called USB_HOST1 and USB_HOST2 Each of them has own connector both situated near the Ethernet connector Each of connector has own low loss power distribution switch SY6280 which protects the board in case the devices you have plugged to the board try to draw more current than 523mA combined The maximum current available on each of the USB hosts is exactly 523mA The SY6280 responsible for the USB_HOST1 is enabled by USBO DRV1 processor pin A4 The SY6280 responsible for the USB HOST 2 is enabled by USBO DRV2 processor pin A5 USB HOST con
30. final Returns of incorrect ordered items are allowed subject to a 10 restocking fee What is unaffected If you hooked it to power you affected it To be clear this includes items that have been soldered to or have had their firmware changed Because of the nature of the products we deal with prototyping electronic tools we cannot allow returns of items that have been programmed powered up or otherwise changed post shipment from our warehouse All returned merchandise must be in its original mint and clean condition Returns on damaged scratched programmed burnt or otherwise played with merchandise will not be accepted All returns must include all the factory accessories which come with the item This includes any In Circuit Serial Programming cables anti static packing boxes etc With your return enclose your PO Also include a brief letter of explanation of why the merchandise is being returned and state your request for either a refund or an exchange Include the authorization number on this letter and on the outside of the shipping box Please note It is your responsibility to ensure that returned goods reach us Please use a reliable form of shipping If we do not receive your package we will not be held liable Shipping and handling charges are not refundable We are not responsible for any shipping charges of merchandise being returned to us or returning working items to you The full text might
31. found in chapters 2 7 GPIO under Debian and 2 8 I2C and SPI under Debian 6 9 1 GPIO 1 General Purpose Input Output 40pin connector This connector features the processor signals needed for audio headphones output and microphone input Please note that not only the connectors but also the rest of the schematic is missing You would need to add resistors and capacitors The connector also has the signals needed for a VGA output The official Linux Debian images include a script that can be used to change the video output to VGA We don t provide Android images for the VGA video output Microphone signals are MICIN1 and VMIC Headphone signals are HPOUTL HPCOM and HPOUTR Please note that part of the VGA and composite video signals are multiplexed VGA R VGA B VGA G share the same pins with the TVOUT signals Composite video signals are located on GPIO 1 connector TVOUTO GPIO 1 pin 20 TVOUT1 GPIO 1 pin 22 TVOUT 2 GPIO 1 pin 24 you would also need AGND GPIO 1 pin 4 VGA signals are located at GPIO 1 connector and LCD CON connector The total of 5 signals you need for VGA output can be split into two categories 1 Data signals VGA R AC17 VGA B AB16 16 2 Synchronization signals LCD VSYNC AC9 and LCD HSYNC AB9 If you inspect the schematics of a board with VGA connector like A20 OlinuXino MICRO carefully you would notice that there are two extra transistors on the synchronization lines Tho
32. ic Fixed the table of GPIO 2 according to the latest schematic 8 2 Board revision H 17 03 15 Remember to check the schematics and the board design files to compare the differences ee release of the board Page 44 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 8 3 Useful web links and purchase codes The web page you can visit for more information about your device are Product page https www olimex com Products OLinuXino A20 A20 OLinuXino LIME Wiki article of the board https www olimex com wiki A20 OLinuXino LIME A place for general questions FAQ or friendly talk https www olimex com forum You can get the latest updates on the software at https github com OLIMEX OLINUXINO You may may join our IRC channel olimex 2 freenode net http webchat freenode net channels olimex The sunxi community is behind the Allwinner Linux support http linux sunxi org Main Page ORDER CODES A20 OLinuXino LIME the product which the document manual is about A10 OLinuXino LIME BOX an aesthetic box specially made for the board that protects it from dust and accidental short circuits USB SERIAL CABLE F USB serial console cable female USB MINI CABLE standard USB type A to USB type mini cable SY0605E reliable power supply adapter 50Hz EU 5V 1A for A20 OLinuXino LIME SY0605E CHINA cheaper power supply adapter 50Hz EU 5V 1A for A20 OLinuXino LIME A20 LIME ANDROID S
33. icle Q How to edit board configurations and definitions in the official Android images A There is a wiki article about that please visit wiki article Page 48 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 8 5 Product support For product support hardware information and error reports mail to support olimex com All document or hardware feedback is welcome Note that we are primarily a hardware company and our software support is limited Please consider reading the paragraph below about the warranty of Olimex products All goods are checked before they are sent out In the unlikely event that goods are faulty they must be returned to OLIMEX at the address listed on your order invoice OLIMEX will not accept goods that have clearly been used more than the amount needed to evaluate their functionality If the goods are found to be in working condition and the lack of functionality is a result of lack of knowledge on the customers part no refund will be made but the goods will be returned to the user at their expense All returns must be authorized by an RMA Number Email support olimex com for authorization number before shipping back any merchandise Please include your name phone number and order number in your email request Returns for any unaffected development board programmer tools and cables permitted within 7 days from the date of receipt of merchandise After such time all sales are considered
34. ink you visit clearly indicates that the image is suitable for the microSD card since there are images suitable for NAND memory also The images suitable for the microSD memory and those suitable for NAND card are different However the upload method is almost identical using PhoenixSuit There are two types of Android images for microSD card that we usually provide and each of them has to be downloaded to a microSD card using a different method The image provided for microSD card is either the native Android image that can be downloaded to the card via a software tool like PhoenixSuit through the board or an image taken from an already prepared microSD card that requires to simply write the image through a microSD card reader It is more likely that you have an Android image that requires a simple copy to a card If that is the case you can follow the exact steps as for Linux e g using Win32 Disk Imager or dd command In order to prepare a microSD card with a native Android you will need a software tool called PhoenixSuit and then Install and run PhoenixSuit Go to the firmware tab of the program and point to a valid Android image note that the images on Gdrive are compressed and you have to extract the archives to img files to be able write them with PhoenixSuit Disconnect the power supply and USB cable from the A20 board Put an SD card in micro SD holder We recommend 4GB class 10 card Press and hold RECOVERY bu
35. located in opt sunxi tools directory cd opt sunxi tools chscr sh This will convert script bin file from sdcard to script fex file and the file will be opened using nano editor Now you can change the board modules and parameters save the changes CTRL X confirm with Y and exit CTRL X again from nano editor wrscr sh this will convert script fex to script bin and the script bin file will be written to the microSD card reboot Reboot the board and the new settings would be applied Alternatively you can do the changes on the microSD card off the board You would need to remove the microSD card and explore it in a microSD card reader You would need to edit the configuration file script bin and edit the settings inside This file is usually located in Script bin can t be opened in the binary format so you would need to convert it to fex file format first There are ready to use tools that convert script bin lt gt script fex Note that script bin fex contains configuration settings and definitions not only for the video output but also for the pin descriptions and names power setting and much more If you really want to modify and customize the default images to change port functions port names to disable specific peripherals you would need to be able to edit the script files Please refer to the following web page for more information http inux sunxi org Fex Guide Page 15 of 49 OLIMEXO 2015 A20 OLinuXino
36. marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc Page 37 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 9 3 GPIO 3 General Purpose Input Output 40pin connector o 3 EC ee I as pue k ee ou pa SCS pas o peu m pua p p 2 p kW Ca pas W pus p x pa es pas e wwo o pas x peu a b a 3 pem po es p je dem p 6 9 4 GPIO 4 General Purpose Input Output 20pin connector GPIO 4 connector features the rest of the signals available and few additional signals that might need testing Poa le O s pas gt vm pes wwe Bur o aw Cua qwe o pem pg Jem Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else th
37. nectors USB_HOSTI Signal name Processor pin _ USB_HosT2 signal name Processor pin sv temectes to in ei v connected to GN C um a im om po ooo um pre o Jm mo de The GND is common for both levels of the USB HOST 6 6 Ethernet The LIME board is equipped with a standard RJ45 Ethernet connector at the top of the board that allows you to access local network via an Ethernet cable The LAN connectivity is handled by Realtek s RTL8201CP Some of the features of this 10 100Mbit controller are Page 30 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 10 100Mbps operation Full half duplex operation Supports auto crossover detection Adaptive equalization EEE 802 3 802 3u compliant Supports IEEE 802 3u clause 28 1 8V Operation with 3 3V IO signal tolerance and much more The Ethernet connector is grounded according to the standard check GND1 and GND2 lines on the schematics If you use Linux then the Ethernet connector might be used for SSH connection to the board If you lack any other option for debugging it might be hard to guess the correct IP of the board since it has DHCP enabled by default especially if you are in a large network It is good idea to check the default settings by exploring the Linux image settings Those are usually stored in etc network interfaces For DHCP you need to enable auto detection an
38. o change the resolution It is very good idea to use a serial cable for connection to the board from a personal computer since in this case you are dependent on a video resolution a cable like USB SERIAL CABLE F When the board boots type Jchange display Or Jchange display A20 lime sh Then the main menu of the video configuration script shows up and you can select the desired interface LCD HDMI or VGA Select output isable all screens Set configuration for LCD Set configuration for HDMI Set configuration for VGA The supported resolutions are listed below For LCD 1 4 3 480x272 2 7 800x480 3 10 1024x600 For HDMI 0 480i 576i 480p 576p 720p50 720p60 1080150 1080160 1080p24 Page 14 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 9 1080p50 10 1080p60 For VGA please note that there is no VGA connector and you might need to install additional hardware more instructions on the VGA signals might be found in the chapter 6 1680x1050 1440x900 1360x768 1280x1024 1024x768 800x600 640x480 1920x1080 1280x720 Chose the resolution that suits you and reboot the board If you decide to edit the configurations yourself the easiest way would be to do it on the board This can be done offline too manipulating the image located on the microSD card via a microSD card reader The tools for script bin changing are
39. of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual A20 LIME DEBIAN SD a tested class 10 micro SD card with the latest by the time of leaving Olimex facilities official Debian Linux release USB SERIAL CABLE F female USB serial console cable USB MINI CABLE standard USB type A to USB type mini cable A10 OLINUXINO LIME UEXT GPIO adapter which makes LIME GPIOs available breadboard friendly 0 1 step connectors needed if you want to connect an older Olimex made display to the board newer displays listed below have 0 05 step connector CABLE 40 40 10CM 0 05 step cable for connecting a LCD CON to A10 OLINUXINO LIME UEXT LCD OLINUXINO 4 3TS low cost 4 3 LCD display with touchscreen component 480x272 LCD OLINUXINO 7TS low cost 7 LCD display with optional touchscreen component 800x480 LCD OLINUXINO 10TS low cost 10 LCD display with optional touchscreen component 1024x600 LCD OLINUXINO 15 6 low cost 15 6 LCD display 1366x768 LCD OLINUXINO 15 6FHD low cost Full HD 15 6 LCD display 1920x1080 CABLE IDC40 15cm 0 1 step cable for connecting an LCD to LCD CON SATA HDD 2 5 500GB 5GB 2 5 SATA hard disk SATA CABLE SET cables that allow the connection of a 2 5 hard disk to the board ALUMINIUM HEATSINK 20x20x6MM heatsink radiator for better processor heat dissipation Note that some of the items above carry the A10 name but are suitable for use with the A20 design due to the boards
40. on Chapter 7 provides the schematics and the dimensions of the board Chapter 8 contains the revision history useful links and support information Page 7 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 2 SETTING UP THE OLINUXINO BOARD 2 Introduction to the chapter This section helps you set up the OLinuXino development board for the first time Please consider first the electrostatic warning to avoid damaging the board then discover the hardware and software required to operate the board The procedure to power up the board is given and a description of the default board behavior is detailed 2 1 Electrostatic and electrical polarity warning OLinuXino is shipped in a protective anti static package The board must not be exposed to high electrostatic potentials A grounding strap or similar protective device should be worn when handling the board Avoid touching the component pins or any other metallic element Ensure that your development board gets attached to properly working hardware For example it is common for cheap HDMI monitors to lack grounding Avoid TVs which have no grounding on their power supply cable If you can t avoid them try to add the grounding yourself if this is not possible please use USB ISO to save your development board from potential over voltage If you connect other electrical devices to the LIME board make sure that they have equal electrical polarity For example when you connect an H
41. ot possible then please hold PWR button down for a few seconds to turn off the board Then you are free to remove the power supply If you disconnect the power supply either the USB the battery or the power jack before turning off the board you may corrupt your SD card If you have placed NAND memory you can corrupt the image on the NAND memory 2 5 Interacting with the board There are five typical ways to interact with A20 OLinuXino LIME You can interact with A20 OLinuXino LIME and a personal computer or another board via UARTO and a serial debug cable an HDMI monitor via the HDMI connector and an HDMI cable an LCD display via LCD CON connector and 0 05 step 40 pin cable a personal computer or another board via the mini USB connector and a mini USB cable using SSH protocol via Ethernet via Ethernet connector and LAN cable using SSH protocol More details on each of the connections might be found in the consequent sub chapters Note that not all interface options are available for all images Furthermore some of the ways of interaction are obviously not suitable for Android OS The official Debian image should give you Page 11 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual the most possible options of interfacing the board Using HDMI LCD_CON or LAN might require additional configurations Furthermore it is possible to corrupt the output settings over those interfaces and thus lose the output In such
42. ou can download the official Linux image from the wiki pages https www olimex com wiki A20 OLinuXino LIME When removing the card please make sure that you release it from the connector by pushing and NOT by pulling the card directly this can damage both the connector and the microSD card Page 25 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 2 1 SD MMCI slot The schematic related to the SD MMC1 microSD connector is shown below MicroSD i R26 17 R27 ok 508 03 SD MMC4 L CD DAT3 CS M C98 2246 76 30 hs SDO CLK Braet 869 01 DATA RES AR AA 1206 X803 488 100K DAT2 RES TCL470nH 0805 1 76R 250mA RM464 SD DET R29 l CH k MIcRO_SD MMC_CP_NEWTFC WPAPR 8 SD MMC1 slot is the microSD card slot located on the top of the board This slot is typically used for booting the OS due to the larger capacities of the microSD cards compared to SD or MMC cards It is suggested to have an SD card with a proper Linux Android image especially if you have ordered a version of the board without NAND memory It is also recommended to use Class 10 10M Byte sec card for faster read write operations lower class cards especially higher capacity ones might slow down the whole system SD MMC1 connector 7 pare po SDO DO M19 1 SDO D1 M20 Additionally the
43. parallel YUV 444 I F Supports 5M CMOS sensor Supports dual sensors BH MEMORY m DDR2 DDR3 DDR3L controller B NAND Flash controller with 64 bit ECC m AUDIO m Integrated HI FI 100dB Audio Codec W Dual analog mic amplifiers Page 22 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual More information can be found on Allwinner s web site at the following web address http www allwinnertech com en product A20 html A good source of information on the processor is the linux sunxi wiki article http linux sunxi org A20 4 2 Block diagram The block diagram is taken from Allwinner s web site ARM Cortex A7 Thumb 2 FPU ARM Cortex A7 NEON SIMD Interface GPU Video Engine ARM Mali400 DDR3 DDR3L DDR2 ARM Mali400 Display Engine Connectivity Display Interface USB OTG 2 USB HOST CPU RGBLCD TV Decoder HDMI1 4 HOCP TV Encoder Page 23 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 5 CONTROL CIRCUITY 5 Introduction to the chapter Here you can find information about reset circuit and quartz crystals locations the power supply circuit is also briefly discussed 5 1 Reset The board has hardware reset controlled by the AXP209 power system management IC It is a good practice to perform software reset of the board Performing reset by disconnecting the power supply might lead to software corruption of the operating system of choice
44. pin 9 of GPIO3 USB_OTG connector 5V_OTG PWR UDMO USB IDDET GND me p The connector case is also grounded We have configured an Android image with settings suitable for A20 OLinuXino LIME Then using PhoenixSuit tools we uploaded the image to the board via the USB The image is available for users to try and tweak the settings The images can be downloaded from the wiki article at https www olimex com wiki A20 OLinuXino LIME The board variant without NAND needs an SD card with bootable OS Android or Linux There are ready images available for download at the above linked A20 wiki article To repair the image on NAND re upload it following these easy steps 1 Install and run PhoenixSuit can be found in the wiki article of the board 2 Go to firmware tab of the program and point to a valid Android image the latest official one may also be downloaded from the wiki article 3 Disconnect the power supply and USB cable from the A20 board 4 Press and hold RECOVERY button apply power supply 5V release RECOVERY button 5 Connect USB cable to the mini USB connector 6 You will be asked for drivers for the bootloader Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables or manually point the installer to the drivers folder in the PhoenixSuit installation path 7 PhoenixSuit will detect the board and would ask for the method o
45. powerful and suitable for heavier computational tasks but more power hungry The processor swap is possible since the A10 and A20 processors are pin to pin compatible Page 6 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 1 4 Board version used in the manual Revision C boards and resources were used while writing this document It is possible that they are outdated so it is always recommended to download the latest sources from the GitHub page of the board https github com OLIMEX OLINUXINO tree master HARDWARE Please note that A20 OLinuXino LIME design is almost identical to the design of its predecessor A10 OlinuXino LIME the only difference being the processor Even then the processors are pin to pin compatible Some peripherals documents or software may be suitable for both the A20 and the A10 LIME boards but it is generally advised to use resources for the specific board 1 5 Document organization Each section in this document covers a separate topic organized as follows Chapter 1 is an overview of the board usage and features Chapter 2 provides a guide for quickly setting up the board and software notes Chapter 3 contains the general board diagram and layout Chapter 4 describes the component that is the heart of the board the A20 Allwinner processor Chapter 5 is an explanation of the control circuitry associated with the microcontroller Chapter 6 covers the connector pinout peripherals and jumper descripti
46. rals are presented Notes regarding the interfaces are given 6 1 UARTO interface The UARTO interface might be used for serial communication between the board and a personal computer by default In case of video output problem a cable might provide needed feedback and greatly reduce the efforts needed to repair the board or to adjust the software setting Note that by default only UARTO is defined as a port suitable for serial debug You can use our USB SERIAL CABLE F for debugging Consider table below when connecting the USB SERIAL CABLE F according to the wire color code The RX line of the cable GREEN wire should go to TX line of the target board the TX line of the cable RED wire should go to the RX line of the target board The BLUE wire should go to the target s GND line UARTO 6 2 MicroSD connector The micro SD slot is primarily used for booting the operating system The board works with micro SDHC cards up to 32GB of storage As a general precaution be careful with the SD cards you purchase There is a big percentage of fake cards due to the low effort required to counterfeit popular brands and the big demand for SD cards worldwide When in doubt try the same operation with another card from another brand Olimex sells microSD cards with Linux or Android images that have been tested please refer to chapter 2 2 Requirements Of course if you already have a large enough microSD card y
47. re are the WP and CP switches that are responsible respectively for sensing whether the card is locked for reading and whether there is a card inserted Page 26 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 6 3 PWR jack The power jack used is the typical DC barrel jack one used by Olimex 2 1x6 3x9 2mm in most of our products More information about the exact component might be found here https www olimex com wiki PWRJACK You should provide 5 volts direct current and the required current may vary depending on the peripherals connected to the board The power supply you use should be capable of providing at least 1A of current More info about the power supply can be found in chapter 5 of this manual 6 4 USB_OTG The main way of changing the firmware image located on the NAND of A20 OLinuXino LIME AGB is via the USB OTG connector the update of the Android image is explained at the bottom of this sub chapter The connector can also be used for establishing SSH connection to the default Debian Linux of LIME boards for more information about the tethering please refer to 2 5 4 SSH via mini USB cable in Debian The part of the schematic related to the USB_OTG is shown below ee q m pH2 USBO DRU IL USBO DRU 2 if U T G USB VBUSDET L5 US ___ 628 2 USB OTG 8
48. reful to avoid the connection to the serial cable else there would be a short circuit Make sure that the serial cable is connected to your personal computer and recognized properly after driver installation Then open a terminal program on the serial COM port which the cable is associated with The settings for the connection are 115200 baud 8 N 1 After everything else is set you would need to power the board as explained in 2 3 Powering the board 2 5 2 HDMI monitor All official Debian and Android images for A20 OLinuXino LIME have HDMI output enabled by default The board would work out of the box with a native HDMI monitor Make sure to use a tested HMDI cable The default HDMI resolution in the official images is 720p60 1280x720p at 60Hz In order to change that setting the video output on the LCD display you would need to run a configuration script if you use Debian Linux or download a suitable image if you use Android Video output settings are hard coded in Android images but there are ways to edit the images You might more information about editing pre built Android images at this wiki article how to edit prebuilt Android images More information about the video output settings and the usage of video settings script might be Page 12 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual found in chapter 2 6 Changing the default image resolution 2 5 3 LCD display Various LCD displays can be attached
49. rent but fully compatible DDR3 memories due to supply unavailability It is always recommended to check the exact memory name printed on the component itself 4GB 1x 32Gb 4096M x 8 NAND FLASH only available on the 4GB version of the board the exact memory used in the board revision mentioned is Hynix H27UBG8T2A PWR LED turns on upon powering the board CHGLED lights when charging a battery connected to the Li Po battery connector Page 41 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 7 SCHEMATICS 7 Introduction to the chapter In this chapter is located information about the schematics describing logically and physically A20 OLinuXino LIME 7 1 Eagle schematic OLinuXino schematics may be found it on the OLinuXino s GitHub repository https github com OLIMEX OLINUXINO tree master HARDWARE You can download the whole repository as zip without having a GitHub account Please note that the schematics of A20 OlinuXino LIME and A10 OlinuXino LIME are similar and it is possible that a single board file and schematic for both boards exist We mostly use Eagle by Cad Soft 4 16r2 for designing However the files should be compatible with the latest Eagle available Cad Soft offers a trial version of their software that allows you to inspect schematics and board files without being able to modify them This work is licensed under the Creative Commons Attribution ShareAlike 3 0 Unported License To vie
50. se are transistors meant to shift the levels to 5V The 3 3V levels from the processor might work but the standard requires 5V levels of VSYNC and HSYNC However if you lead the signals to a 6 pin Page 35 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual header like the one on the A20 board you might use the cable for the A20 OlinuXino MICRO called A20 VGA CABLE The 6 signals needed are the 5 signals mentioned about plus GND A general advice for easier use of the microphone headphone and VGA interfaces of A20 OLinuXino LIME is to take a look at the schematics of another board with those interfaces already installed For example those are present in A20 OLinuXino MICRO Inspect the schematic carefully The signal layout is described below GPIO 1 connector ignal name Processor pin Pin ignal name rocessor pin G 2 3 3V lt 2 gt e G gt w N N N AB23 m N HG RADC1 ICIN1 MIC POUTL 19 PCOM 19 20 POUTR GA G ui N m IG lt N m N y C20 G UJ w N 5 I lt I 70 oO ul CY N HG v p o 0 C HB gt gt GA R Pai gt B18 gt CY HB lt lt lt G T UJ gt gt 00 NIN
51. to A20 OLinuXino LIME and used to interact with the board Depending on the display chosen and whether you attempt to run Debian Linux or Android additional video settings configuration may be required It is always a good idea to have one of the other connection options available as back up in case the video output settings need modification For more information refer to chapter 2 7 Connecting and calibrating a display 2 5 4 SSH via mini USB cable in Debian The latest official Debian Linux image allows the use the USB connector for SSH connection without the need of a LAN cable or a serial cable You can use a mini USB cable connected between your host PC and the on board mini USB connector For connection convenience there is a DHCP server running specifically for USBO interface The DHCP server should give IP address to the new USBO interface of your host PC so you can make SSH connection from your PC to the default board IP address of the USBO interface 192 168 2 1 You can connect to the board using a mini USB cable and an SSH client if you use Windows you might use puTTY for example at address 192 168 2 1 For Windows operating system upon connection the board should show up in Windows Device Manager as RNDIS Ethernet Gadget You might be asked to install a driver The drivers can be found online as RNDIS driver Remote Network Driver Interface Specification The drivers are provided by Microsoft and the
52. tton apply power supply 5V release RECOVERY button Connect USB cable to the mini USB connector You will be asked for drivers for the boot loader Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables or manually point the installer to the drivers folder in the PhoenixSuit installation path Page 47 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual PhoenixSuit will detect the board and would ask for the method of writing the image Choose method of writing the image and confirm your wish to write the image Wait till upgrade succeeds Note that it is not recommended to have your mini USB connected to an external USB hub This might cause delays and might distort the signal levels Always test with the USB connected straight to the USB ports of your computer Important When Android runs for very first time it takes several minutes to initialize all files and buffers please do not cut the power supply during this process Also when fresh image is installed fast boot may be disabled which means that when you apply power supply after few seconds Android will go in sleep mode and you have to press PWR button to start it you can change to fast boot when you power off there is dialog box asking you if you want next boot to be fast boot you have to check this box before you power off Also note that you must do touch screen calibration when you run Android for very first time
53. u might also use the Python script mentioned in the next chapter 2 9 12 and SPI under Debian I2C and SPI are both supported in the latest Debian releases There is a python module called pyA20Lime which also might be found here https pypi python org pypi pyA20Lime At the same web address you would also find information on how the library is used 2 10 Software support We maintain Linux and Android images for SD card which might be downloaded for free and modified as the user wishes The latest images and updates are featured at the wiki article of the device https www olimex com wiki A20 OLinuXino LIME We usually try to provide details on how to build the Linux and the Android images at our wordpress page http olimex wordpress com The required files details on building the latest Debian images for Olimex A20 boards might be found at the following GitHub address https github com OLIMEX OLINUXINO tree master SOFTWARE A20 A20 build Another useful place is the Olimex forums where a lot of people share their experience and advice https www olimex com forum The official images are a constant work in progress newer releases are packed with better hardware support newer kernels and extra features You are more than welcome to send or share your suggestions and ideas at our e mail the public forums or irc channel We would attempt to help in almost every case We listen to the feedback and if the majority of users s
54. uggest a software change or update we try to implement such Customer feedback is very important for the overall state of the software support However do not expect full Linux or Android software support We can share our experience We can give you full details for things we have tried We can point you to a resource or a guide We can give you general directions to solving a specific problem or Page 18 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual places to look for more information However we won t install a piece of software for you or write custom program for you We won t provide a specific software solution to a specific software problem Page 19 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 3 A20 OLINUXINO LIME BOARD DESCRIPTION 3 Introduction to the chapter Here you get acquainted with the main parts of the board Note the names used on the board might differ from the names used below to describe them For the actual names check the A20 OLinuXino LIME board itself 3 1 Layout top view The picture below shows the top side of the board and highlights the most important parts RAM MEMORY CASE MOUNT GPIO 4 LCD DISPLAY 512 MB POWER LED POWER SUPPLY 5V ONLY LIPO battery connector SATA Charge LED NAND MEMORY USB_HOST2 USB_HOST1 zs 5 9 E 10 Rev C LAN Ethernet GPIO 3 Allwinner A20 Debug port Page 20 of 49 OLI
55. visit https www olimex com for more info Page 45 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 8 4 Frequently asked questions Q I power my board it shows a logo and then nothing happens A This might be due to a number of reasons but it is recommended to try the following 1 Download latest official image from our wiki either Android or Debian for SD card and upload it to an SD card again There are instructions how to do it in the other questions below Try if the board works now 2 Check if your power supply provides enough current try with different better power supply 3 Check the USB hub you are using plug the USB cable directly to the back of your personal computer check the USB cable 4 The board might enter sleep mode very fast especially if the Android was turned off without the Quick Boot mode being ticked on Try pressing or holding down the PWR button for a couple of seconds to wake it up Q use LCD_CON for video output There is some screen flickering under Debian What could be the reason A This is usually caused by either a loose cable connection or badly configured script bin Double check if all cables are properly connected Also check if there is a change in the behavior if you either twist the cables carefully or press different components at the back If the above doesn t fix the flickering problem edit the script bin parameter lcd io cfg0 make sure that it is set to 0
56. w a copy of this license visit http creativecommons org licenses by sa 3 0 If you are looking for a schematic of an older revision of the board and it isn t available at our web site you may request it by the support e mail Page 42 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual 7 2 Physical dimensions Note that all dimensions are in mils prever All dimensions are in mills 3305 Page 43 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual CHAPTER 8 REVISION HISTORY AND SUPPORT 8 Introduction to the chapter In this chapter you will find the current and the previous version of the document you are reading Also the web page for your device is listed Be sure to check it after a purchase for the latest available updates and examples 8 1 Document revision Document revision odified pages A 28 08 14 Initial manual release Added information about new displays C 03 11 14 Added information about GPIO I2C SPI New section about the initial connection D 30 01 15 Fixed information about power jack 2 5 E 09 02 15 Fixed information about the CMOS TTL 11 convertor 12 F 10 02 15 Added information about the SSH via miniUSB in Debian Information about the Windows driver for the tethering To Clarified how to prepare a microSD card with Android OS Updated HDMI part according to the latest schematic Updated DDR3 memory according to the latest schemat
57. x272 Yes No Product page LCD OLinuXino 7 7 800x480 Yes Yes Product page LCD OLinuXino 7TS 7 800x480 Yes Yes Product page LCD OLinuXino 10 10 1024x600 Yes Yes Product page LCD OLinuXino 10TS 10 1024x600 Yes Product page LCD OLinuXino 15 6 15 6 1366x768 Yes No Product page LCD OLinuXino 15 6FHD 15 6 1920x1080 Yes No Product page The displays whose names contain TS include a resistive touch screen component 2 7 1 Android calibration Calibrating a display under Android is pretty straightforward from the Android application Important initially the boards are calibrated for a specific display and resolution If you re write the image no matter whether the SD card or the NAND memory you might need to use a mouse to calibrate the display initially It might be impossible to calibrate it via touching the display 2 7 2 Debian calibration The command that allows calibrating in Debian Linux is ts calibrate Page 16 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual The default Debian setup is made with settings for HDMI 720p 60Hz If you want to change some other LCD VGA or HDMI resolution then you have to start script file in root directory If the problem is under Debian Linux make sure you are properly logged in the XFCE interface Else applying calibration would not happen for the current user if you are calibrating from the X graphical interface make sure that you are logged as user olimex if cali
58. y should be available for every Windows distribution refer to the respective files and articles provided by Microsoft on how to install the required drivers 2 5 5 SSH via Ethernet connector SSH protocol allows you to login remotely to the command line interface of the A20 OLinuXino LIME board You would need an active Ethernet connection to the board The newest images have a configuration that allows SSH via the Ethernet connector The static IP address to access the board is 192 168 1 254 2 6 Changing the default image resolution Depending on the display or the screen you want to use with the A20 OLinuXino LIME you might need to apply software changes to the prebuilt Android or Linux image The typical OLinuXino user would not need to edit the files however To ease the process of changing the resolution we have compiled a number of Android images for the Android users with hard coded video output settings Alternatively for Debian Linux users we have provided a shell script that can be executed in order to set preferred video output and resolution Page 13 of 49 OLIMEXO 2015 A20 OLinuXino LIME user s manual For Android that you boot from the NAND memory you would need an image suitable for the specific resolution Download locations to such images might be found at the wiki article for the A20 board here https www olimex com wiki A20 OLinuXino LIME For Linux Debian you would need to execute a shell script to be able t
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