netudenntui
Dependencies: mbed SDFileSystem
max6675.cpp
- Committer:
- mitinori
- Date:
- 2019-11-27
- Revision:
- 0:184cd74fc1d8
File content as of revision 0:184cd74fc1d8:
#include <mbed.h> #include "max6675.h" max6675::max6675(SPI& _spi, PinName _ncs) : spi(_spi), ncs(_ncs) { } float max6675::read_temp() { short value = 0; float temp = 0; uint8_t highByte=0; uint8_t lowByte=0; select(); wait(.25); //This delay is needed else it does'nt seem to update the temp highByte = spi.write(0); lowByte = spi.write(0); deselect(); if (lowByte & (1<<2)) { error("No Probe"); } else { value = (highByte << 5 | lowByte>>3); } 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; } void max6675::select() { ncs = 0; } void max6675::deselect() { ncs = 1; }