Santiago Escobar / Mbed 2 deprecated Taller1

ss

Dependencies:   mbed MPU6050

max6675.cpp@0:ac37887d5bb2, 2021-02-22 (annotated)

Committer:
SantiagoE
Date:
Mon Feb 22 19:24:30 2021 +0000
Revision:
0:ac37887d5bb2
ss

Who changed what in which revision?

UserRevisionLine numberNew contents of line
SantiagoE 0:ac37887d5bb2 1
SantiagoE 0:ac37887d5bb2 2 #include <mbed.h>
SantiagoE 0:ac37887d5bb2 3 #include "max6675.h"
SantiagoE 0:ac37887d5bb2 4
SantiagoE 0:ac37887d5bb2 5 max6675::max6675(SPI& _spi, PinName _ncs) : spi(_spi), ncs(_ncs) {
SantiagoE 0:ac37887d5bb2 6
SantiagoE 0:ac37887d5bb2 7 }
SantiagoE 0:ac37887d5bb2 8
SantiagoE 0:ac37887d5bb2 9 float max6675::read_temp() {
SantiagoE 0:ac37887d5bb2 10 short value = 0;
SantiagoE 0:ac37887d5bb2 11 float temp = 0;
SantiagoE 0:ac37887d5bb2 12
SantiagoE 0:ac37887d5bb2 13 uint8_t highByte=0;
SantiagoE 0:ac37887d5bb2 14 uint8_t lowByte=0;
SantiagoE 0:ac37887d5bb2 15
SantiagoE 0:ac37887d5bb2 16 select();
SantiagoE 0:ac37887d5bb2 17 wait(.25); //This delay is needed else it does'nt seem to update the temp
SantiagoE 0:ac37887d5bb2 18
SantiagoE 0:ac37887d5bb2 19 highByte = spi.write(0);
SantiagoE 0:ac37887d5bb2 20 lowByte = spi.write(0);
SantiagoE 0:ac37887d5bb2 21 deselect();
SantiagoE 0:ac37887d5bb2 22
SantiagoE 0:ac37887d5bb2 23
SantiagoE 0:ac37887d5bb2 24 if (lowByte & (1<<2)) {
SantiagoE 0:ac37887d5bb2 25 error("No Probe");
SantiagoE 0:ac37887d5bb2 26 } else {
SantiagoE 0:ac37887d5bb2 27 value = (highByte << 5 | lowByte>>3);
SantiagoE 0:ac37887d5bb2 28 }
SantiagoE 0:ac37887d5bb2 29
SantiagoE 0:ac37887d5bb2 30 temp = (value*0.25); // Multiply the value by 0.25 to get temp in ˚C or
SantiagoE 0:ac37887d5bb2 31 // * (9.0/5.0)) + 32.0; // Convert value to ˚F (ensure proper floats!)
SantiagoE 0:ac37887d5bb2 32
SantiagoE 0:ac37887d5bb2 33 return temp;
SantiagoE 0:ac37887d5bb2 34 }
SantiagoE 0:ac37887d5bb2 35
SantiagoE 0:ac37887d5bb2 36 void max6675::select() {
SantiagoE 0:ac37887d5bb2 37 ncs = 0;
SantiagoE 0:ac37887d5bb2 38 }
SantiagoE 0:ac37887d5bb2 39
SantiagoE 0:ac37887d5bb2 40 void max6675::deselect() {
SantiagoE 0:ac37887d5bb2 41 ncs = 1;
SantiagoE 0:ac37887d5bb2 42 }