Bryan Edelman
/
ADT7310
ADT7310 SPI Temperature Sensor
main.cpp@0:9bc294b44806, 2010-03-04 (annotated)
- Committer:
- pillsburydoughboy
- Date:
- Thu Mar 04 04:57:26 2010 +0000
- Revision:
- 0:9bc294b44806
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
pillsburydoughboy | 0:9bc294b44806 | 1 | #include "mbed.h" |
pillsburydoughboy | 0:9bc294b44806 | 2 | |
pillsburydoughboy | 0:9bc294b44806 | 3 | SPI spi(p11, p12, p13); // mosi, miso, sclk |
pillsburydoughboy | 0:9bc294b44806 | 4 | DigitalOut temp_cs(p8); // chip select |
pillsburydoughboy | 0:9bc294b44806 | 5 | DigitalOut led1(LED1); //debug led |
pillsburydoughboy | 0:9bc294b44806 | 6 | Serial pc(USBTX, USBRX); // tx, rx |
pillsburydoughboy | 0:9bc294b44806 | 7 | |
pillsburydoughboy | 0:9bc294b44806 | 8 | int main() { |
pillsburydoughboy | 0:9bc294b44806 | 9 | float temp = 0; |
pillsburydoughboy | 0:9bc294b44806 | 10 | temp_cs = 1; |
pillsburydoughboy | 0:9bc294b44806 | 11 | |
pillsburydoughboy | 0:9bc294b44806 | 12 | temp_cs = 0; |
pillsburydoughboy | 0:9bc294b44806 | 13 | spi.format(8,3); //falling edge, clock idle high |
pillsburydoughboy | 0:9bc294b44806 | 14 | spi.frequency(5000000); |
pillsburydoughboy | 0:9bc294b44806 | 15 | spi.write(0x08); //write to config register |
pillsburydoughboy | 0:9bc294b44806 | 16 | spi.write(0x10); //contin conversion mode |
pillsburydoughboy | 0:9bc294b44806 | 17 | temp_cs = 1; |
pillsburydoughboy | 0:9bc294b44806 | 18 | |
pillsburydoughboy | 0:9bc294b44806 | 19 | temp_cs = 0; |
pillsburydoughboy | 0:9bc294b44806 | 20 | spi.write(0x54); //contin read mode |
pillsburydoughboy | 0:9bc294b44806 | 21 | temp_cs = 1; |
pillsburydoughboy | 0:9bc294b44806 | 22 | |
pillsburydoughboy | 0:9bc294b44806 | 23 | spi.format(16,3); |
pillsburydoughboy | 0:9bc294b44806 | 24 | while (1) { |
pillsburydoughboy | 0:9bc294b44806 | 25 | led1 = 0; |
pillsburydoughboy | 0:9bc294b44806 | 26 | temp_cs = 0; |
pillsburydoughboy | 0:9bc294b44806 | 27 | temp = spi.write(0x0000); //write 16 dummy bits to read 16 bits |
pillsburydoughboy | 0:9bc294b44806 | 28 | temp_cs = 1; |
pillsburydoughboy | 0:9bc294b44806 | 29 | if (temp<0) |
pillsburydoughboy | 0:9bc294b44806 | 30 | temp = (temp -32768)/128; //negative temp calculation |
pillsburydoughboy | 0:9bc294b44806 | 31 | else |
pillsburydoughboy | 0:9bc294b44806 | 32 | temp = temp/128;//div by 128 16bit positive temp |
pillsburydoughboy | 0:9bc294b44806 | 33 | led1 = 1; |
pillsburydoughboy | 0:9bc294b44806 | 34 | pc.printf("Temperature = %1.6f \r", temp); |
pillsburydoughboy | 0:9bc294b44806 | 35 | wait(1); |
pillsburydoughboy | 0:9bc294b44806 | 36 | } |
pillsburydoughboy | 0:9bc294b44806 | 37 | |
pillsburydoughboy | 0:9bc294b44806 | 38 | } |