ATAN0046: ATA8510-EK1 User Guide
Contents
1. display_mutex buffer_mutex RF_event_mutex transceiver_task display_task control OLED control UART read received data and process acknowledgement generate display data display_mutex prio 3 prio 2 The task description and the text strings generated by the user_task and the transceiver_task are as follows e _user_task handles the user entry with buttons1 3 and creates the start page and menus to be displayed Start page Shows the welcome message with software and transceiver firmware version information and awaits a remote sensor signal ATA8510 EK1 Demo Kit c Atmel 2015 v1 1 Free RTOS FW2 1 Waiting for RF signal Button 1 menu Shows the statistics with the number of valid data telegrams which have passed the checks the number of error telegrams which have failed during checking and the total number of telegrams including false detection Receiver statistics valid 3062 error 15 total 3099 Button 2 menu Shows parameters used in the RF telegram RF channel 433 92MHz Data rate 8kBit s FSK deviation 8kHz Manchester coding ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel Button 3 menu Shows parameters used for the virtual COM port These parameters have to be set in the PC terminal application To receive the text strings COM port settings baudrate 9 6Kbaud 8 data 1 stop bit no parity no handshake transceiver_task Reads the received data from the transceive2. connect the PC1 pin to GND A Java GUI tool is used for generating the EEPROM programming file in HEX format see 7 for the tool software and user guide which is not included in the tool pack 10 This tool can save all settings in an xml file and handling is described in the user guide 7 and the settings in the user manual 9 The tool pack includes two subdirectories which contains the xml and HEX files for the base and the remote sensor Software base EEPROM Configuration file for the Atmel ATA8515 base station device Software sensor EEPROM Configuration file for the Atmel ATA8510 remote sensor device Only service 0 with channel 0 is used for the RF telegram All other service settings can be ignored For the base station the polling is defined in the polling tab of the GUI ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel Altmel Enabling Unlimited Possibilities OnE amp wv Atmel Corporation 1600 Technology Drive San Jose CA95110 USA T 1 408 441 0311 F 1 408 436 4200 www atmel com 2015 Atmel Corporation Rev 9343C INDCO 07 15 Atmel Atmel logo and combinations thereof Enabling Unlimited Possibilities AVR and others are registered trademarks or trademarks of Atmel Corporation in U S and other countries Other terms and product names may be trademarks of others DISCLAIMER The information in this document is provided in connection with Atmel products No license express or implie
3. Atmel APPLICATION NOTE User Guide for the Evaluation Kit ATA8510 EK1 ATAN0046 Features e User guide for the ATA8510 EK1 evaluation kit e Demonstrates an application with the e RF transceiver Atmel ATA8515 in a base station with an Xplained PRO SAMD20 kit e Atmel ATA8510 RF transceiver remote sensor with an AT30TS75A temperature sensor and an optional CMM 1923 real time clock e two way RF communication Description This user guide describes an evaluation kit for industrial RF applications having the follow ing components e A base station using an e Xplained PRO SAMD20 evaluation kit e Xplained PRO OLED extension board e Xplained PRO ATA8510 15 extension board e Remote temperature sensor with Atmel ATA8510 running a Flash application The Atmel ATA5815 is used as an RF transceiver in the base station and runs in polling mode to detect data telegrams and displays the received message on the OLED The received message is also streamed to a PC terminal program using a virtual COM port connection The remote sensor includes an AT30TS75A temperature sensor device and a CMM 1923 real time clock device for waking up the Atmel ATA8510 RF transceiver The Flash appli cation reads the temperature data from the sensor device using a TWI bus protocol implemented in software and broadcasts the temperature data via the RF link The RF application uses a 2 way communication i e the transmitted RF telegrams are acknowledged from the r
4. JV Maintain Folder heirarchy for source files Recommended lt Previous Next gt Finish Cancel ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel 4 3 3 After selecting Next gt the device has to be selected The Atmel ATA8510 device is not currently listed and the ATA5831 device the similar automotive device has to be selected instead as shown in Figure 4 6 Selecting Finish shows the project window and after selecting the debug tool the debugging can be performed much the way you would when using the base software Figure 4 6 Device Selection for Debugging Open Object File For Debugging Project Creation Wizard Device Selection Select the Target MCU device Device Family All Search for device Name App Boot Memory Kbytes Data Memory bytes EEPROM bytes Device Info a AT90U5B1287 128 8192 4096 z AT90USB162 16 512 512 Device Name ATASS31 AT90USB646 64 4096 2048 Speed 0 AT90USB647 64 4096 2048 Vee 27155 AT90USB82 8 512 512 Family megaAVR ATA5790 16 512 2048 ATAS790N 16 512 2048 ff Datasheets ATA5795 8 512 2048 ATA5831 20 1024 1152 S ppoiled Tooke ATA5832 20 1024 1152 ATA5833 20 1024 1152 gi AVR Dragon z lt Previous Next gt Finish Cancel The Atmel ATA8510 device uses the debugWire interface for the debug connection described in the user manual 9 This connection uses the reset line on pin PCO of the device a
5. 100kHz Select the file Base_Station_ EEPROM hex for the EEPROM mem ory For the fuse settings the fuses SPIEN and EESAVE should be set 3 For re programming of the Atmel ATA8510 device of the remote sensor attach the mini ISP connector to the con nector ISP and the debug tool and insert the CR2032 battery or apply an external 3V power supply to the mini ISP connector Remove the CMM1923 rtc module and connect pin VCC to PB4 on connector X1 to prevent the device from entering the OFF mode Select the device ATA5831 in the device programming tool and ensure that the ISP clock is set lt 100kHz Select the file Remote_Sensor_Flash hex for the flash memory and the file Remote_Sensor_EEPROM hex for the EEPROM memory For the fuse settings the fuses SPIEN and EESAVE should be set ATANO046 APPLICATION NOTE 17 Atmel l l 9343C INDCO 07 15 4 4 18 EEPROM Data Settings The EEPROM of the Atmel ATA8510 and ATA8515 device includes the configuration of the device and the settings for the RF protocol This EEPROM must be programmed before running application software either as an embedded Flash application or as a host application using the SP communication link The Atmel ATA5831 device has to be selected instead of the Atmel ATA8510 or ATA8515 within the programming dialog of Atmel Studio 6 Make sure that the ISP signals are available for the programmer only and that the device is not in OFF mode by pulling an NPWRON lt x pin to GND level i e
6. 1b ATA8510 15 Description LEDO LED1 Indicates an active RF event LED1 LED2 Indicates an active display_task LED2 LED3 Indicates an active transceiver_task LED3 LED4 Indicates an active user_task Atmel ATANO046 APPLICATION NOTE 13 9343C INDCO 07 15 4 3 4 3 1 14 The buttons of the OLED extension board have the function as described above in the user_task while SWO on the Xplained PRO SAMD20 board has no function BUTTON1 Shows the receiver statistics BUTTON2 Displays RF parameter settings BUTTON3 Displays COM port settings Software Development Atmel Studio 6 is required for base station software development and can be downloaded from the Atmel website 4 In addition the tool pack 10 with software and documentation is required IAR Embedded Workbench for AVR 5 and the JTAGICE3 AVR debug tool 4 are required for remote sensor software development Xplained PRO SAMD20 Base Station The project file for base station software development is located in the extracted folder in the subdirectory Software base SAMD20 Atmel Studio 6 project directory After installation of Atmel Studio 6 the USB driver is automatically installed when connecting the Xplained Pro SAMD20 board for the first time When opening Atmel Studio 6 you will see the landing page of this kit were you can obtain the documentation and sample projects i e including FreeRTOS examples The OLED display shows the welco
7. 6 has to be used instead Once the program is compiled and linked within IAR Workbench the file fwFLASH d90 has to be opened within Atmel Studio 6 as shown in Figure 4 5 To select the right directory paths use the lt gt buttons to locate the d90 file and for the Location Figure 4 5 Debugging the Remote Sensor Software AtmelStudio Administrator File Edit View AssistX ASF Project Debug Tools Window Help Ne Siren dl vn ec 1 Open gt Project Solution Ctrl Shift 0 Close B3 Fie Ctrl 0 Close Solution BY Open Object File For Debugging Import wl Save Selected Items Ctrl S Save Selected Items As i Save all Ctrl Shift 5 Export Template U Page Setup 4 Print Ctrl P Recent Files Recent Projects and Solutions Exit Alt F4 Open Object File For Debugging Project Creation Wizard Object File Path and Project Name Selection Specify the object file path project name and project location Select the Object File To Debug een Sensor 4TA5831_FLASH_IAR_2 32 0 Sensor_KeyFoblapplifwFlash IAR Debug Exe fwFLASH d90 Specify Project Name and path Atme Studio will create a new project objproj for the object file opened for debugging Specify a name for the project and the location where the project folder should be created Project Name Remote_Sensor Location SensornATA5831_FLASH_IAR_2 32 0 Sensor_KeyFobiapphfwFlash
8. ATA8510 remote sensor 2 An SAMD20 application with EEPROM settings for the Atmel ATA5815 receiver The following section describes each program flow The IAR embedded workbench for AVR 5 is used together with the JTAGICE3 debug tool for Flash application development of the remote sensor Atmel Studio 6 4 is used together with the debug tool included on the Xplained PRO SAMD20 board for SAMD20 application development The source code for all applications is available within the tool pack distribution 10 4 1 Flash Application for the ATA8510 Remote Sensor The program flow for the remote sensor application is illustrated in Figure 4 1 The initial state of the device is the OFF mode The real time clock of the remote sensor wakes up the transceiver every 2s and switches the device to active mode The temperature sensor is powered up and read out followed by the transmission of the data telegram During transmission of this data telegram the supply voltage level is checked and if this is below 2 2V an error message is transmitted after a delay of 200ms The device then enters the OFF mode again until the next wake up by the RTC or by pressing the S2 button Figure 4 1 Flash Application for the Atmel ATA8510 Remote Sensor Initialisation check wake up source switch sensor power and LED on Measurement perform temperature measurement 40ms Wait 200ms Perform 2 way RF communication switch off LED and transmit data teleg
9. VA View iE A Outline a Solution Explorer Debugging of the application is performed within Atmel Studio 6 together with the Xplained PRO SAMD20 board This board includes an embedded debugger which is controlled by Atmel Studio 6 Remote Sensor IAR Embedded Workbench for AVR is required for remote sensor software development 5 The project file is located in the extracted subfolder Software sensorn ATA5831_FLASH_IAR_2 32 0 IAR Embedded Workbench project directory After opening the IAR project Remote_sensor eww file the following workspace window is available see Figure 4 4 Figure 4 4 Remote Sensor Software stm jfwFLASH Debug O firmware a E src hh KeyFobSensor_asm_flash s90 E KeyFobSensor_flash_temp c E twimaster c E FlashRomAppl c fsminttable_flash_asm s90 o E Output D fwFLASH d90 O fwFLASH hex L B fwFLASH map fwFLASH ATANO046 APPLICATION NOTE 15 Atmel l l 9343C INDCO 07 15 Select the following files from the workspace window to start evaluating the software FlashRomAppl c Main program start with initialization and activation of the application loop KeyFobSensor_flash_temp c Application functions called within the main function The implementation can be analyzed compiled and linked together with the program flow shown in Figure 4 1 on page 11 Debugging of the application is currently not supported within IAR Embedded Workbench using the AVR debug tool JTAGICE3 Atmel Studio
10. temperature shown in the datasheet 1 and 3 Figure 3 3 indicates current consumption measured at a room temperature of 24 C ATANO046 APPLICATION NOTE 9 Atmel 9343C INDCO 07 15 10 Figure 3 3 Remote Sensor Current Consumption at 24 C i mA tx mode 9 40000 measure mode and LED 0 53500 measure mode only 0 06500 0 00035 Off mode 0 10 20 30 40 50 60 70 80 t ms Table 3 1 summarizes battery life for a CR2032 and CR2450 coin cell without using the LED during temperature measurement at 20 C It is assumed that the battery voltage drops from the initial value of 3V down to 2V by the end of battery service The self discharge is defined by the manufacturer with typically 1 per year at an ambient temperature of 20 C The battery life for this application primarily depends on the measurement interval Ts which defines the duration of the OFF mode whereas measurement and transmit mode have fixed durations Table 3 1 Battery Life at 20 C Interval Ts Mean Current Battery Lifetime Days Years mA CR2032 230mAh CR2450 560mAh Days Years Days Years 2 0 053 180 0 5 437 1 2 5 0 022 445 1 2 1083 3 0 10 0 011 875 2 4 2131 5 8 20 0 006 1696 4 6 4130 11 3 50 0 002 3880 10 6 9448 25 9 ATANO046 APPLICATION NOTE Atmel 9343C INDCO 07 15 4 Software Description The demo application uses the following programs 1 A Flash application with EEPROM settings for the Atmel
11. 23 3 attached to the connector X1 and the AT30TS75A 2 temperature sensor The S1 and S2 buttons are placed on the board with the S1 button not used in this application and the S2 button used for initiating data telegram transmission The LED flashes during a temperature measurement before transmitting the RF data telegram The mini ISP header is used for Flash and EEPROM programming and for Flash application debugging of the Atmel ATA8510 see 8 for more details about Flash application development ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel Figure 3 2 Remote Sensor Transceiver Board ATA8510 Remote Sensor atapesioa viio Atmel pre wy Automotive vad coh 9 c2 ATA8510 transceiver mini ISP connector R4 R3 Taser Button 1 2 Mons S siis HANSS BRS5 BRE KZ 1E337072 LED mi Lot 8 CMM 1923 rtc AT30TS75A sensor The current consumption profile over time is shown in Figure 3 3 During the temperature measurement period of 40ms the LED is switched on in parallel increasing current consumption Figure 3 3 shows current consumption for the measurement period with and without LED The RF telegram transmission takes about 11ms at a power level of 6dBm resulting in current consumption of about 9 4mA In OFF mode the temperature sensor is switched off and the resulting current is indicated by the Atmel ATA8510 transceiver and the CMM 1923 RTC current consumption This OFF mode current is highly dependent on ambient
12. EXT1 extension header of the Xplained PRO SAMD20 board as shown in Figure 1 2 The 433MHz whip antenna is mounted on the X4 connector of the Xplained PRO ATA8510 15 board These boards are powered using the USB cable connected to the debug USB connector of the Xplained PRO SAMD20 board The USB cable can be connected to a 5V 500mA USB power supply for stand alone operation When using the virtual COM port the USB cable is connected to a PC s USB port which requires previous installation of Atmel Studio 6 IDE 4 This installation includes all required USB drivers for operation of the Xplained PRO SAMD20 board Figure 1 2 ATA8510 EK1 Kit 4 ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel Atmel Studio 6 can be downloaded from 4 with additional user instructions and tools Documentation for the Xplained PRO SAMD20 and Xplained PRO OLED1 are also available from 4 Documentation for other components in the kit and the software is included in the tool pack zip folder 10 available from your Atmel sales representative The OLED displays a welcome screen after power up ATA8510 EK1 Demo Kit c Atmel 2015 V1 1 Free RTOS FW2 1 Waiting for RF signal and waits for an RF telegram from the remote sensor After installing the CR2032 coin cell into the remote sensor be sure to observe correct polarity the sensor immediately starts sending RF telegrams at 2s intervals when the optional RTC module is installed The OLED shows the tempe
13. chronisation Start bit 1 0 Start bit to indicate data payload 8 0x14 ID for no valid sensor data 8 0x19 ID for low battery voltage Vcc lt 2 2V Data payload 8 0x64 ID for temperature data 55 to 125 C 16 Signed integer Temperature value 0 1 C resolution 8 Checksum Checksum of ID and data payload as 2th complement Total 88 Data telegram with Ttx 11ms at 8kBit s The acknowledge protocol send by the remote sensor has the following data Table 2 2 Acknowledge Protocol Protocol Item of Data Bits Value Description Preamble 55 h Pre burst for wake up and synchronisation Start bit 1 0 Start bit to indicate data payload 8 0x60 ID for RSSI data Data payload 16 Integer RSSI value 0 255 8 Checksum Checksum of ID and data payload as 2th complement Total 88 Data telegram with Ttx 11ms at 8kBit s 6 ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel 2 2 Data protocol for Base Station Acknowledge The base station acknowledge protocol parameters are shown in Table 2 3 The Manchester encoding is using a low to high transition for a 0 bit and a high to low transition for a 1 bit Table 2 3 Acknowledge Protocol Protocol Item of Data Bits Value Description Preamble 55 ak Pre burst for wake up and synchronisation Start bit 1 0 Start bit to indicate data payload 8 0x60 ID for RSSI data Data payload 8 0x60 Repeated Total 72 Data telegram with Ttx 9ms a
14. d by estoppel or otherwise to any intellectual property right is granted by this document or in connection with the sale of Atmel products EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS AND PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time without notice Atmel does not make any commitment to update the information contained herein Unless specifically provided otherwise Atmel products are not suitable for and shall not be used in automotive applications Atmel products are not intended authorized or warranted for use as components in applications intended to support or sustain life SAFETY CRITICAL MILITARY AND AUTOMOTIVE APPLICATIONS DISCLAIMER Atmel products a
15. eceiver The RF link operates on channel 433 92MHz at an 8kBit s data rate using FSK modulation with Manchester encoding 9343C INDCO 07 15 References 1 Atmel ATA8510 ATA8515 datasheet 2 Atmel AT30TS75A datasheet 3 C MAX CMM 1923 V1 0 datasheet 4 http Awww atmel com 5 http Awww iar com 6 Atmel ATANO096 ATA8510 Programmers Guide 7 Atmel ATANO035 ATA583x and ATA578x Configuration Tool Guide and software 8 Atmel ATANO036 ATA583x and ATA578x Flash Application Development 9 Atmel ATA8510 ATA8515 User Manual 10 ATA8510 EK1_Tool_Pack_V1 0 zip 2 ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel 1 Getting Started Figure 1 1 shows the components which are included in the evaluation kit The kit includes e A base station with e Xplained PRO SAMD20 evaluation board e Xplained PRO OLED1 extension board e Xplained PRO ATA8510 15 extension board A remote temperature sensor with Atmel ATA8510 1 AT30TS75A 2 and an optional CMM 1923 3 devices A mini USB cable A mini ISP adapter A 433MHz whip antenna The remote sensor requires a CR2032 coin cell battery not included in the kit Figure 1 1 ATA8510 EK1 Kit Components Xplained PRO SAMD20 Xplained PRO ATA8510 15 Xplained PRO OLED1 ATA8510 Sensor ATANO046 APPLICATION NOTE 3 Atmel 9343C INDCO 07 15 The Xplained PRO OLED1 board is connected to the EXT3 extension header and the Xplained PRO ATA8510 15 board is connected to the
16. me screen described in the user_task and waits for a remote signal from the remote sensor After attaching the battery to the remote sensor the RF telegram is immediately transmitted with an update of the temperature RF telegram interval and RSSI signal strength parameter at 2s intervals You can also view the received information by opening a PC terminal application and selecting the COM port of the Xplained PRO board with a baud rate of 9 6Kbaud 8 data bit 1 stop bit no parity and no handshake selected To start evaluating the software you can select the following files from the solution window inside Atmel Studio 6 see Figure 4 3 main c Program start with initialization and activation of the RTOS tasks demotasks c FreeRTOS implementation of the demo software The implementation can be analyzed and debugged together with the program flow shown in Figure 4 2 on page 12 Additional documentation regarding the other ASF functions and the FreeRTOS can be obtained within Atmel Studio 6 Help and from http www freertos org ATANO046 APPLICATION NOTE 9343C INDCO 07 15 Atmel 4 3 2 Figure 4 3 Base Software Solution Explorer 5 Solution SAMD20 1 project SAaMD20 Sa Dependencies Sj Output Files lt j Libraries E src asr a common aj samo E amp thirdparty ay CMSIS a freertos E config asf h a demotasks c Ln demotasks h in documentation h Ic main c ASF Explorer
17. nd must be enabled within ISP programming mode If debugWire mode is enabled the ISP mode is not available and vice versa Select Disable debugWire connection within the Debug menu to return to ISP mode The 6 pin ISP connector is used as a connection to the debugger and it is recommended to connect only the Vec GND and reset signal when debugging leaving the SPI signals open for the application This is important because the TWI driver software uses the PB1 pin as an SCL line shared with the ISP and SPI peripheral Additional information on how to perform development and debugging with the Atmel ATA8510 device is provided in 6 and 8 This application note describes development for the Atmel ATA5831 device which in terms of Flash development is similar to the Atmel ATA8510 device Re programming of the Devices The tool pack 10 includes the original programming files to re program all devices in the kit 1 For re programming of the SAMD20 device select the device ATSAMD20J18 in the device programming tool of Atmel Studio 6 and the file SAMD20_Flash hex for the flash memory 2 For re programming of the Atmel ATA8515 device on the XplainedPRO ATA8510 15 extension board disconnect the board and apply an external 3V power supply to the connector X7 Connect pin 5 of connector X3 to GND to prevent the device from entering the OFF mode and select the device ATA5833 in the device programming tool and ensure that the ISP clock is set lt
18. on file for the Atmel ATA8515 device of the base station Atmel Studio 6 project directory Software project and sources for the remote sensor Configuration file for the Atmel ATA8510 device of the remote sensor IAR Embedded Workbench project directory ATAN0046 APPLICATION NOTE 5 9343C INDCO 07 15 2 Data Protocol and Signal Timing The remote sensor is sending a RF data telegram every 2s or when the button S2 is pressed with the temperature data The base station receiver is polling for this data telegram on RF channel 433 92MHz in regular intervals of 5ms The RF transmission and data protocol of the remote sensor and the base station is using the following settings e Transmission order is MSB first for preamble and data section RF channel 433 92MHz e e Data rate 8kBit s with FSK modulation and Manchester encoding e Deviation 8kHz Each data packet uses 2 bits before and after the data telegram to force a Manchester code violation which is detected by the receiver to separate the data packets und to restart the synchronisation procedure of the receiver 2 1 Data Protocol for Remote Sensor Telegram The remote sensor data protocol parameters are shown in Table 2 1 The Manchester encoding is using a low to high transition for a 0 bit and a high to low transition for a 1 bit Table 2 1 Data Protocol Protocol Item of Data Bits Value Description Preamble 55 al Pre burst for wake up and syn
19. plained PRO OLED1 board are available within Atmel Studio 6 or on the Atmel website 4 The hardware description of the Xplained PRO ATA8510 15 extension board and the remote sensor are included in the tool pack zip folder 10 The base station is powered by the USB cable whereas the remote sensor uses a CR2032 coin cell battery Base Station Transceiver The Atmel ATA8515 base station transceiver is mounted on an adapter board as shown in Figure 3 1 This adapter board is plugged onto the Xplained PRO ATA57810 15 extension board which includes the LEDs 1 4 The adapter board has a programming adapter XISP1 which is used for programming the EEPROM configuration data into the device This extension board is connected to the EXT1 and PWR header of the Xplained PRO SAMD20 board The extension board has two additional connectors X6 for supplying the kit with 5V and X7 to access the kit s internal 3V supply voltage Figure 3 1 Base Station Transceiver Board Xplained PRO ATA8510 15 Extension Board So pug i ISP connector omae Bd Lo ae a i LED1 4 J ATA8515 transceiver 1 4i 433MHz wip antenna GE TOO Automotive Atme GND e Remote Sensor Transceiver The Atmel ATA8510 remote sensor transceiver is placed on a key fob board as shown in Figure 3 2 This remote sensor is powered by a CR2032 coin cell battery not included mounted on the bottom of the board The board contains the real time clock CMM 19
20. r device checks for data consistency and creates a text string for display The measurement display shows the time interval dt between reception of two consecutive RF telegrams together with the RSSI value for the RF signal strength The temperature at the sensor is shown with a resolution of 0 5 C dt 2s rssi 221 RSSI 128 T 22 5 C Or This message is shown when the received data telegram is corrupted or when the temperature sensor is broken or not present eeu Sta EP Ea Tae eae OP Ae al Sensor error No valid sensor data LJ Fa Fa Va PTO TF Or This message is shown when the sensor battery voltage is less than 2 2V and needs to be replaced ROE Oe eeu GD Ae et Sensor error Low battery voltage BORE Eee OE edt eid Or This message is shown when the RF receiver detects a signal on another RF channel this must be enabled in the EEPROM configuration of the receiver RF channel error Wrong RF telegram display_task Prints the text string from the user_task or transceiver_task on the OLED and sends the text string via the virtual COM port to the PC terminal window The status of the tasks is displayed on LEDO of the Xplained PRO SAMD20 board and on LED1 3 of the Xplained PRO OLED extension board in parallel to the LEDs on the Xplained PRO ATA8510 15 extension board as listed in Table 4 1 Table 4 1 LED Functions Xplained PRO Xplained PRO Xplained PRO SAMD20 0
21. ram 11ms Transmission transmit error telegram 11ms Low battery voltage Wake up 2 source applied released ATANO046 APPLICATION NOTE 11 Atmel 9343C INDCO 07 15 4 2 12 Base Station Application for SAMD20 MCU Using freeRTOS The program flow for the SAMD20 application is illustrated in Figure 4 2 This application uses freeRTOS http www atmel com as an operating system for the device and includes a total of three tasks with different priority levels The tasks and the mutex objects are instantiated and initialized before starting the scheduler in the demotask_init function After initializing the hardware and peripherals and before entering an infinite loop the main function not shown in Figure 4 2 calls this demotask_init The RF event callback function indicates to the transceiver_task the occurrence of an RF transceiver event using the RF_event_mutex object The user_task checks for button presses and correspondingly switches the display The display_task shows the text strings generated by the transceiver_task or the user_task The display activity is controlled by the buffer_mutex and display_mutex mutexes The buffer_mutex controls access to the display buffer and the display_mutex controls access to the OLED and the UART Figure 4 2 Flash Application for SAMD20 MCU demotasks_init RF event callback create mutex create tasks user_task check buttons generate menus
22. rature value from the sensor with a resolution of 0 5 C The time interval between the RF signal reception in seconds and the signal strength rssi on the base station and RSSI on the sensor is also shown dt 2s rssi 221 RSSI 128 T 22 5 C l When removing the CMM 1923 real time clock the transmission of an RF telegram can be initiated by pressing the S2 button for more information see Figure 3 2 on page 9 The display can be switched to different modes via the buttons 1 3 on the Xplained PRO OLED1 extension board for more information see Section 4 2 Base Station Application for SAMD20 MCU Using freeRTOS on page 12 The tool pack zip folder 10 contains the documentation and software for the kit Extract the folder into a directory on the PC to get the following structure Application_Notes devices Documentation Hardware Software Software Programming_Files Software IDE_Support_Files Software base Software base EEPROM Software base SAMD20 Software sensor Software sensor EEPROM Software senson ATA5831_FLASH_IAR_2 32 0 Atmel Documentation for the kit and the application notes for the Device datasheets Hardware documentation of the boards Kit software and tool support extensions Device programming files in hex format Tool support files for IAR Workbench and Atmel Studio 6 Software project and sources for the Xplained PRO kit Configurati
23. re not designed for and will not be used in connection with any applications where the failure of such products would reasonably be expected to result in significant personal injury or death Safety Critical Applications without an Atmel officer s specific written consent Safety Critical Applications include without limitation life support devices and systems equipment or systems for the operation of nuclear facilities and weapons systems Atmel products are not designed nor intended for use in military or aerospace applications or environments unless specifically designated by Atmel as military grade Atmel products are not designed nor intended for use in automotive applications unless specifically designated by Atmel as automotive grade
24. t 8kBit s 2 3 Signal Timing The signal timing of the data transfer is shown in Figure 2 1 1 the remote sensor transmits a data telegram with duration of 11ms every 2s or when button S2 is pressed TX1 The pre amble duration is 7ms while the data payload duration is 4ms The remote sensor switches then into receive mode with a timeout period of 20ms RX 2 the base station is polling for a valid RF signal which matches the RF channel the data rate the modulation scheme and the correct data encoding every 5ms This polling interval is chosen to match with the length of the pre amble When a valid telegram is received RX1 the base station immediately acknowledges this telegram TX and waits for an acknowledgement frame from the remote sensor with the remote sensor signal strength data and a timeout of 90ms RX2 3 The remote sensor transmits the acknowledgement frame with the RSSI signal strength TX2 and switches then into OFF mode 4 The base station reads the acknowledgement frame with the RSSI data RX2 displays the result and switches into polling mode again Figure 2 1 Signal Timing I I l Remote TX1 RX TX2 TX1 RX mode i itis N74 3 _ _ I sasomo i ax aT e fh di I I 1 I Atmel I i 5ms i I I I 2s ATANO046 APPLICATION NOTE 7 9343C INDCO 07 15 3 1 3 2 8 Hardware Description The description and documentation of the Xplained PRO SAMD20 board and the X
Download Pdf Manuals
Related Search