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Library to interface with the MAX31723 PMON
Fork of MAX31855 by
Diff: max31855.cpp
- Revision:
- 2:c976447044ec
- Parent:
- 1:5eeee89cb281
--- a/max31855.cpp Tue Oct 23 10:51:21 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,102 +0,0 @@ - -#include <mbed.h> -#include "max31855.h" - -max31855::max31855(SPI& _spi, PinName _ncs) : spi(_spi), ncs(_ncs) { - -} - -float max31855::read_temp() { - short value = 0; - float temp = 0; - - //Variables to hold probe temperature - uint8_t tempProbeHigh=0; - uint8_t tempProbeLow=0; - - //Variables to hold chip temperature and device status - uint8_t tempChipHigh=0; - uint8_t tempChipLow=0; - - if (pollTimer.read_ms() > 250){ - //Set CS to initiate transfer and stop conversion - select(); - - //Read in Probe tempeature - tempProbeHigh = spi.write(0); - tempProbeLow = spi.write(0); - - //Get the chip temperature and the fault data - tempChipHigh = spi.write(0); - tempChipLow = spi.write(0); - - //Set the chip temperature - chipTemp = (tempChipHigh<<4 | tempChipLow>>4)*0.25; - - //Set CS to stop transfer and restart conversion - deselect(); - - //Check for a fault (last bit of transfer is fault bit) - if ((tempProbeLow & 1)==1){ - //Chip reports a fault, extract fault from Chip Temperature data - int faultType = (tempChipLow & 7); - - faultCode=faultType; - - return 2000+faultType; - /*if (faultType==1){ - //Open circuit (no TC) - return 2000 + faultType; - }else if (faultType==2){ - //Short to GND - return 2000 + faultType; - }else if (faultType==4){ - //Short to VCC - return 0.4; - }else{ - return 0.5; - }*/ - }else{ - //Integer value of temperature - value = (tempProbeHigh<< 6 | tempProbeLow>>2); - - //Get actual temperature (last 2 bits of integer are decimal 0.5 and 0.25) - temp = (value*0.25); // Multiply the value by 0.25 to get temp in C or - // * (9.0/5.0)) + 32.0; // Convert value to F (ensure proper floats!) - - return temp; - } - }else{ - //Chip not ready for reading - return -1; - } -} - -void max31855::select() { - //Set CS low to start transmission (interrupts conversion) - ncs = 0; -} - -void max31855::deselect() { - //Set CS high to stop transmission (restarts conversion) - ncs = 1; - //Reset conversion timer - pollTimer.reset(); -} - -void max31855::initialise(int setType) { - //Start the conversion timer - pollTimer.start(); - faultCode=0; -} - -int max31855::ready() { - //Check to see if conversion is complete - if (pollTimer.read_ms() > 250) { - //Conversion complete - return 1; - }else{ - //Conversion incomplete - return 0; - } -} \ No newline at end of file