added spectrometer timeout
Dependencies: SDFileSystem mbed
Fork of All_Combined_Real2 by
Diff: temp_sensor.cpp
- Revision:
- 3:c611fff05072
- Child:
- 9:924d80730ac5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/temp_sensor.cpp Tue Mar 15 17:52:05 2016 +0000 @@ -0,0 +1,83 @@ +#include "temp_sensor.h" + +/* MCP9808 high accuracy temp sensor from adafruit (no address pins pulled up) */ +#define MCP9808_REG_TEMP (0x05) // Temperature Register +#define MCP9808_REG_CONF (0x01) // Configuration Register +#define MCP9808_ADDR (0x30) // MCP9808 base address 0x18<<1 + +I2C i2c(PTE25, PTE24); + +char data_write[3]; +char data_read[2]; +int tempval; + +volatile char TempCelsiusDisplay[] = "+abc.dd C"; + +void init_temp_sensor() { + + wait(3); + i2c.frequency(10000); // default is 100000 + + /* Configure the Temperature sensor device MCP9808: + - Thermostat mode Interrupt not used + - Fault tolerance: 0 + */ + data_write[0] = MCP9808_REG_CONF; + data_write[1] = 0x00; // config msb + data_write[2] = 0x00; // config lsb + int status = i2c.write(MCP9808_ADDR, data_write, 3, 0); + if (status != 0) { // Error +// pc.printf(" error status = 0x%08x\r\n", status); +// while (1) { +// myled = !myled; +// wait(0.2); +// } + } + +} + +void check_temp() { + // Read temperature register + data_write[0] = MCP9808_REG_TEMP; + i2c.write(MCP9808_ADDR, data_write, 1, 1); // no stop + i2c.read(MCP9808_ADDR, data_read, 2, 0); + + if(data_read[0] & 0xE0) { + data_read[0] = data_read[0] & 0x1F; // clear flag bits + } + if((data_read[0] & 0x10) == 0x10) { + data_read[0] = data_read[0] & 0x0F; + TempCelsiusDisplay[0] = '-'; + tempval = 256 - (data_read[0] << 4) + (data_read[1] >> 4); + } else { + TempCelsiusDisplay[0] = '+'; + tempval = (data_read[0] << 4) + (data_read[1] >> 4); + } + + // fractional part (0.25°C precision) + if (data_read[1] & 0x08) { + if(data_read[1] & 0x04) { + TempCelsiusDisplay[5] = '7'; + TempCelsiusDisplay[6] = '5'; + } else { + TempCelsiusDisplay[5] = '5'; + TempCelsiusDisplay[6] = '0'; + } + } else { + if(data_read[1] & 0x04) { + TempCelsiusDisplay[5] = '2'; + TempCelsiusDisplay[6] = '5'; + }else{ + TempCelsiusDisplay[5] = '0'; + TempCelsiusDisplay[6] = '0'; + } + } + + // Integer part + TempCelsiusDisplay[1] = (tempval / 100) + 0x30; + TempCelsiusDisplay[2] = ((tempval % 100) / 10) + 0x30; + TempCelsiusDisplay[3] = ((tempval % 100) % 10) + 0x30; +} + + +