PIC-P40-USB development board User`s Manual
Contents
1. PIC P40 USB development board User s Manual Rev B July 2013 Copyright c 2007 OLIMEX Ltd All rights reserved INTRODUCTION PIC P40 USB board was designed in mind to create board which to allow easy interface for your embedded projects to computers with USB It s based around the popular FTDI chips FT232 Some of you will say wait a minute why to use additional expensive chip to interface my PIC to USB when I have seen on Microchip s web site that there are PICs with buid in USB controller as peripheral Here is the catch USB Universal Serial Bus was created by the big boys Microsoft Intel NXP HP NEC you can find more info at www usb org and it s really great way to add peripherals to PC computers as it carry both data signals and power supply but as it s universal the programming of USB device is not easy job The USB interface is simple host device interface On the PC there is HOST controller which provide the power and make the communication but because on the USB there are so many type of peripherals which are supported like Human interface devices like mouse joysticks tablets etc Communication Devices like modems links routers etc Image devices like scanners web cameras etc Mass storage devices like hard drives flash memories etc Audio devices like microphones and speakers you can imagine that writing the USB host controller software is not easy job and there are several programming layers for the2. e LED to RE1 through jumper e user Button to RE2 e Reset button and circuit e USB type B connector e Extension slot on every uC pin e Gird 100 mils e GND bus e Vcc bus e Four mounting holes 3 3 mm 0 13 e FR 4 1 5 mm 0 062 green soldermask white silkscreen component print e Dimensions 100x80 mm 3 9x3 15 HARDWARE 5V 5V 5V usb FET1 AN N IRLML6402 N 9 HE ICSP 10 c9 C7 1 Ter 3V MCLR THV TXD PGD RB7 ORXD RAO ANO PGC RB6 RTS RA1 AN1 RB5 CTS RA2 AN2 RB4 amp DTR 9 FAVA RA3 AN3 PGM RB3 amp DSR Ta RA4 TOCKI RB2 ODCD RAS AN4 RB1 RSTOUT RI REO RD amp AN5 INT RBO RESET RE1 WR ANG6 C3 RE2 CSH AN7 PSP7 RD7 R12 pete a PSP6 RD6 10K XTIN TXDEN p sulk OSC1 CLKIN PSP5 RD5 TXLED 4 20MH OSC2 CLKOUT PSP4 RD4 BAT54C RXLED 4e l RCO T1OSO RXIRC7 Plek XTOUT 22p RC1 T1OSI TX RC6 EECS L RC2 CCP1 SDO RC5 EESK PWRCTL 1 RC3 SCK SDI RC4 EEDATA O NPWRENf co RDO PSPO RD3 PSP3 27pF_31 Test 622 SLEEP 1K RD1 PSP1 RD2 PSP2 lt T2rpF Copyright C 2005 OLIMEX Ltd TL http Awww olimex com dev SOFTWARE The software might be downloaded from the device s web page DEMOI1 DEMO2z2 DEMOS DEMO4 PIC16F877 UP BLINK LED This is demo code which blinks the LED on PIC P40 USB board Note LED jumper should be closed PIC16F877 UP BUTTON read This is demo code which show how
3. user input connected to PIC microcontroller s RE2 port When RE2 port is initialized as INPUT you will read 0 when the button is pressed and 1 when it is depressed Status LED is connected via jumper to PIC microcontroller s REI port When your RE1 port is initialized as OUTPUT and set to 0 LED will go ON when REI port is set to I LED will go OFF PIC P40 USB have handy GND pin for connection to oscilloscope All modem signals from FT232 are provided and could be used PIC P40 USB have socket for DC EEPROM which are connected to RC4 SDA and RC3 SCL On the schematic you will see PGM_ SEL jumper this is necessary because some PICs use RB3 for ICSP PGM signal others RBS this is done by smd jumper on the back side of the board which is soldered in position RB3 by default PIC18F877 which is used for the demo code if your PIC use RB5 you should connect this jumper properly FEATURES Note that oooooo MH Y R CCGC a gt s o olol sl olal al sl si ol s ol al sisl slo LED jumper reset OLIMEX COM DEU Son 2005 _ HTTP HkN guartz crystal EEPROM 1 There is a GND line at the bottom row of pins of the board under button BUT 2 There is a 5V line at the bottom row of pins of the board above the quartz crystal e ICSP ICD connector for programming and debugging e FT232 USB to RS232 converter e DIL40 microcontroller socket e DIL8 EEPROM socket e Quartz crystal 20Mhz
4. USB stack i e host your application code will have the access to the different peripherals So one USB host stack may consist of many tenths of thousands for high level language code At the USB device side the code is not so complicated as at least you implement not all communication protocols for the devices mentioned above but only your device code but it s still not small code and why you should spend your time to write 1000 lines of code when you want to make simple old good RS232 send and receive byte No much sense I guess but wait there is another catch when you plug the USB device the host assign it an number which is used later to distinguish it from the other USB devices connected to the computer To make the driver installation easier every USB product manufacturer should have his own assigned VENDOR CODE so far so good this means when you plug your Genius web camera Windows know which driver to install The bad for you is that to get this VENDOR CODE you have to pay US 1500 00 to USB ORG guys not bad business at all huh To sell numbers If you decide to make thousands of USB devices it s good idea to have such vendor code but what if you want to make one small prototype which you want to connect to USB Now after reading all above you should not be surprised that FTDI Inc who created USB to RS232 chip FT232 is very popular they give you simple solution to connect to USB without knowing all the stuff behind it without paying u
5. hers 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 Neither the whole nor any part of the information contained in or the product described in this document may be adapted or reproduced in any material from except with the prior written permission of the copyright holder The product described in this document is subject to continuous development and improvements All particulars of the product and its use contained in this document are given by OLIMEX in good faith However all warranties 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
6. pfront for USB vendor code and using the good old fashioned RS232 way to program in your PIC On their web there are drivers for Windows version XYZ Linux Mac OS etc so you can interface your project to machines running all these operating systems with small piece of code in the PIC PIC P40 USB have FT232 USB to RS232 converter IC on board The power is taken from the USB so no need for external power supply adapter Note that when you plug your USB cable there is process of USB enumeration and the power supply to PIC is supplied only when USB host successfully enumerate your PIC P40 USB so power to PIC come with 1 2 seconds delay The on board ICSP connector allow you to program the PIC on the board without pulling it of the socket by ICSP programmer like PIC MCP PIC MCP USB PIC PG1 PIC PG2 PIC PG3 PIC PG4 or to program and debug it with PIC ICD2 PIC ICD2 POCKET or PIC ICD2 TINY IMPORTANT all programmers provide power supply through ICSP connector during the programming PIC P40 USB should not be connected to USB Of course PIC ICD2 have option to not power the target circuit and this option should be used when you debug your application while connected to USB The oscillator circuit is made with 20 Mhz crystal oscillator so you can run your PIC at maximum performance The RESET circuit is made with simple RC circuit Note that RESET button should not be pressed while you program or debug the PIC PIC P40 USB have user button for
7. to read BUTTON status and to switch the LED ON when button is pressed and LED off when the button is depressed PIC16F877 VP RS232 send receive routines This is demo code which show how to use the USART to send and receive characters from host PC via USB cable You must program the HEX code to PIC16F877 and run the code If you programmed the PIC correctly when you plug USB cable on your computer will appear virtual COM port When you open Hyperterminal on your host PC computer with 9600 bps 8 data bit 1 stop bit No flow control the PIC P40 USB every character you type on the hyperterminal will be printed back with i e if you type abc you will receive a b c PIC16F877 VP EEPROM read write routines This is demo code which show how to use the EEPROM to read and write data Note you must put 24LC16 EEPROM in the DILS socket ORDER CODE PIC P40 USB assembled and tested no kit no soldering reguired PIC P40 USB PCB blank PCBs only How to order You can order to us directly or by any of our distributors Check our web https www olimex com for more info Revision history REV A June 2007 REV B July 2013 added new schematic and updated the manual with current links and more information Disclaimer 2007 Olimex Ltd All rights reserved Olimex logo and combinations thereof are registered trademarks of Olimex Ltd Other terms and product names may be trademarks of ot
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