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CBC-EVAL-05 Fiches technique(PDF) 5 Page - Cymbet Corporation |
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CBC-EVAL-05 Fiches technique(HTML) 5 Page - Cymbet Corporation |
5 / 6 page AN-1050: EnerChip™ EH with TI LaunchPad ©2011 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com AN-72-1050 Rev A Page 5 of 6 Using Energy Harvesting Data Logging Firmware with the LaunchPad V1.1 To use the LaunchPad as an energy harvesting datalogger you must use the IAR or Code Composer development environment to build and load the datalogging firmware. The IAR and Code Composer project can be found on the CD-ROM included with the Cymbet EVAL kit or is also available at the Cymbet Corporation web site: http://www. cymbet.com/content/products-resource-docs.asp in the Software/Firmware table. Install the MSP430G2231 chip into the LaunchPad board. Build and load the datalogger application to the LaunchPad board. The datalogger application is based on the original LaunchPad thermal demo code and the original LaunchPad code will be readily apparent from viewing the source. The datalogger code runs first and then defaults to the LaunchPad thermal demo application when plugged into the USB port. USB Powered Mode In this mode the LaunchPad board gets its power from the USB cable. To configure for this mode make sure the flex cable from the Cymbet Energy Harvester is disconnected. Install the original 5 jumpers in the J3 block. Power for the board now comes from the USB connection. Cymbet EVAL Kit Powered Mode This configuration powers the LaunchPad board from one of Cymbet’s energy harvesting EVAL kits. To operate in this mode, you must first unplug the LaunchPad from the USB port and remove jumpers VCC and RST from the J3 jumper block. This keeps the energy harvester from powering the USB interface and only powers the actual MSP430 MCU chip. Connect the 5-pin flat flex cable from the energy harvesting board to J6 of the LaunchPad board as detailed in the appropriate previous section. Log Temperature Data To log temperature data, configure the LaunchPad board in CYMBET POWERED MODE. The LaunchPad will start blinking both of the LEDs at a 1 second rate. A short press of the button starts logging. The green LED will blink with each temperature logged and will initially log one temperature per 2 seconds. After the 32 temperatures are logged, each with a corresponding blink of the green LED, the red LED will blink to indicate the logger registers are full. Go to the next Read Temperature Data section to configure the LaunchPad to send its logged data and clear itself for another run. The 2-second logging interval is declared in a #define statement in the C source code and may be modified by recompiling and reloading the firmware. Read Temperature Data To readout logged data, configure the LaunchPad board for USB POWERED MODE. When the LaunchPad board is plugged into the USB port a COM port driver will appear in the device manager of Windows that is called MSP430 Application UART with an associated COM port number. Note this number. Start up a terminal emulator program like TeraTerm or Hyperterminal and configure to hook this COM port at 9600 baud with no flow control and 1 stop bit and 8 bits of data. The LaunchPad board will now blink the LEDs alternately at about a half-second rate. A short press of the left button will cause any logged data to be sent to the terminal emulator as 8-bit ASCII HEX values that represent the upper 8 bits of the 10-bit A/D converter reading the temperature sensor. If there is no data logged, you will see a 00, on the terminal emulator to indicate no data present. If you don’t see any data the terminal emulator is not configured correctly. If you see logged temperature data you may press the reset button followed by a 1 second press of the left button to again send the data. To erase data press the RESET button and then hold the left button down for over 3 seconds and the application will again send the data but erase it afterwards. After readout the LaunchPad will revert to the original LaunchPad demo software. The application may now be used to log new data. |
Numéro de pièce similaire - CBC-EVAL-05 |
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Description similaire - CBC-EVAL-05 |
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