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Threads
Dependencies: mbed C12832 LM75B
main.cpp
- Committer:
- ciaranom
- Date:
- 2020-12-05
- Revision:
- 8:a27db43e9d85
- Parent:
- 7:d20cc6a9060c
File content as of revision 8:a27db43e9d85:
#include "mbed.h" #include "LM75B.h" #include <string> #include <iostream> #include <stdio.h> #include <cstdlib> LM75B sensor(p28,p27); Serial pc(USBTX,USBRX); //float TempV = 0; //making a float variable for the temperature value int cycles = 300; LocalFileSystem local("local"); // Create the local filesystem under the name "local" FILE* fp; int i = 0; int j = 0; double num = 0; double total = 0; double maxtemp = -99.99; double mintemp = 99.99; Thread WritingThread; Thread ReadingThread; void Writing() { fp = fopen("/local/temp3.csv", "a"); //Open the file for writing to //TempV = (float)sensor; //Temperature is the sensor value if (sensor.open()) //Try to open the LM75B { printf("Device detected!\n\r"); } else { error("Device not detected!\n"); }//end if sensor open printf("Measuring temp... \n\r"); //Print confirmation of code running while (i<cycles) { printf("Test"); //TempV fprintf(fp, "%.2f\n", (float)sensor.temp()); //print values to file i = i+1; // counter wait(1); //Wait 1 seconds to 1*300s = 5 minutes } end while loop for writing function fclose (fp);//close the file j=1; } void Reading() { while (j!=1) { //wait for thread one } fp = fopen("/local/temp3.csv", "r"); //Open rfile for reading char temps[5]; //Create a string that will contain temerature values from file //min max total while (fscanf(fp, "%s", temps)!= EOF) //scan to end of file { num = atof(temps); //string to number --> https://os.mbed.com/questions/7171/How-to-convert-String-to-Float-value/ if(num > maxtemp) //Calculating max number { maxtemp = num; } if(num < mintemp) //Calculating min number { mintemp = num; } total = total+ num; //ThisThread::sleep_for(500); //Set trigger to end thread } j=2; } int main () //Main function *************************************************************************************** { WritingThread.start(Writing); //Start first thread //ReadingThread.start(Reading); //Start second thread WritingThread.join(); //while(j!=1) //{ //} printf("left Thread"); double avg = total/(cycles); printf("Average: %.2f \n\r", avg); printf("Max: %.2f \n\r", maxtemp); printf("Min: %.2f \n\r", mintemp); fclose(fp); // close file //j=j+1 // Controls daily cycle } //end main