Hello world for MAX31855 thermocouple
Dependencies: 4DGL-uLCD-SE MAX31855 mbed-rtos mbed
Fork of Thermo_MAX31855 by
main.cpp
- Committer:
- ericspatterson
- Date:
- 2014-10-22
- Revision:
- 2:0525f2f1dd95
- Parent:
- 1:04f483a4edc0
File content as of revision 2:0525f2f1dd95:
#include "mbed.h" #include "uLCD_4DGL.h" #include "rtos.h" #include "stdio.h" #include "max31855.h" uLCD_4DGL uLCD(p9,p10,p11); // serial tx, serial rx, reset pin; SPI thermoSPI(p5,p6,p7); // setup SPI interface max31855 max1(thermoSPI, p20); //setup max31855 interface Mutex lcd_mutex; // mutex to make the lcd lib thread safe Semaphore four_slots(1); //Activate semaphore // Thread t1 // print the elapsed time on line 1 of the uLCD (i.e., HH:MM:SS) void elapsedtime(void const *args) { //line 2 int s = 00; int m = 00; int h = 00; while(true){ s++; if(s>59){ s=00; m++; } if(m>59){ m=00; h++; } four_slots.wait(); //lcd_mutex.lock(); uLCD.color(0xFFFF00); uLCD.locate(0,0); //col,row wait(0.1); uLCD.printf("ET: %2d:%2d:%2d", h,m,s); //lcd_mutex.unlock(); four_slots.release(); Thread::wait(1000); // update once per secon } } // Thread t2 // print the temperature from the thermocouple - MAX31855 device void thermoread(void const *args) { //line 2 float ftemperature = 0; // float variable for temperature float ctemperature = 0; // float variable for temperature while(true){ if (max1.ready()==1){ ctemperature = max1.read_temp(); //Get the reading ftemperature = (ctemperature)*(9.0/5.0)+32.0; four_slots.wait(); uLCD.color(0xFFFF00); uLCD.locate(0,2); //col,row wait(0.1); uLCD.printf("Temp. F: %4.2f", ftemperature); uLCD.color(0xFFFF00); uLCD.locate(0,4); //col,row wait(0.1); uLCD.printf("Temp. C: %4.2f", ctemperature); four_slots.release(); } } } int main() { max1.initialise(); //initialize thermocouple IC uLCD.baudrate(3000000); //set LCD baudrate Thread t1(elapsedtime); //run elapsed time counter Thread t2(thermoread); //read and display temperature from thermocouple while(1){ //While so program doesn't end } }