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8 years, 11 months ago.

Writing to file with sleep

I am making a temperature monitoring system that displays on a nokia 5110 lcd using a tmp102 temperature sensor. It works well but an issue arises when using sleep along with tickers, specifically when writing a string to a LOG.txt file with sleep enabled it gets stuck just before writing to the log file. It works fine without sleep at the moment.

#include "mbed.h"
#include "N5110.h"
#include "TMP102.h"
#include "RTC.h"
#include "FILEWRITE.h"

#define TMP102_R_ADD 0x91
#define TMP102_W_ADD 0x90

#define N5110_SCREEN_WIDTH 84
#define N5110_SCREEN_HEIGHT 48

void startLogging();
void stopLogging();
void writeTemperatureToFile();
void displayTemperature();

Ticker writeToFile;
Ticker DisplayT;


N5110 n5510Lcd(p7,p8,p9,p10,p11,p13,p21);
//BusIn buttonInput_bus(p17,p16);
DigitalIn A(p17);
BusOut ledBus(LED1,LED2,LED3,LED4);
TMP102 temperature(TMP102_W_ADD, TMP102_R_ADD);
FILEWRITE fileWrite;
RTC rtClock(1);

bool sleepMode = 0;

InterruptIn logSwitch(p18);
InterruptIn wakeScreen(p17);

int main() {
    n5510Lcd.init();
    n5510Lcd.normalMode();
    n5510Lcd.setBrightness(0);
    temperature.init();
    //float temp;
    logSwitch.rise(&startLogging);
    logSwitch.fall(&stopLogging);
    wakeScreen.rise(&displayTemperature);  //separate problem
    //DisplayT.attach(&displayTemperature,7);
   
    while(1)
    { 
        sleep();
    }

}


void startLogging()
{
    n5510Lcd.clear();
    n5510Lcd.setBrightness(0.5);
    writeToFile.attach(&writeTemperatureToFile, 5.0); // THIS IS WHERE THE PROBLEM IS!!!
    n5510Lcd.clear();
    n5510Lcd.printString("LOGGING",0,2);
    n5510Lcd.printString("ENABLED",42,3);
    wait(2);
    n5510Lcd.clear();
    n5510Lcd.setBrightness(0); 
}

void stopLogging()
{
    n5510Lcd.clear();
    n5510Lcd.setBrightness(0.5);
    writeToFile.detach();
    n5510Lcd.clear();
    n5510Lcd.printString("LOGGING",0,2);
    n5510Lcd.printString("DISABLED",36,3);
    wait(2);
    n5510Lcd.clear();
    n5510Lcd.setBrightness(0); 
}


void writeTemperatureToFile()
{
    sleepMode = 0;
    char logTemperatureString[6];
    char logTimeString[20];
    char logFullString[26];
    temperature.getTemperatureString(logTemperatureString, 0);
    rtClock.getLocalTime(logTimeString);
    snprintf(logFullString, 26, "%s, %s\n\r", logTimeString, logTemperatureString);
    fileWrite.writeDataToFile(logFullString);
    sleepMode = 1; 
}


void displayTemperature()
{
    char temperatureString[6];
    char lcdStringBuffer[15];
    n5510Lcd.clear();
    n5510Lcd.setBrightness(0.5);    
    //Print to lcd temperature in degrees celcius
    temperature.getTemperatureString(temperatureString,0);
    sprintf(lcdStringBuffer, "Temp(C): %s", temperatureString);
    n5510Lcd.printString(lcdStringBuffer,0,0);
        
    //Print to lcd temperature in degrees farenheit
    temperature.getTemperatureString(temperatureString,1); 
    sprintf(lcdStringBuffer, "Temp(F): %s", temperatureString); 
    n5510Lcd.printString(lcdStringBuffer,0,1);
        
    wait(2);
    n5510Lcd.clear();
    n5510Lcd.setBrightness(0);
}

The filewrite class I created:

#include "FILEWRITE.h"

LocalFileSystem local("local"); // create local filesystem
FILE *fp;

BusOut fileLeds(LED4,LED3,LED2,LED1);

FILEWRITE::FILEWRITE()
{
   // fileLeds = 15; // turn on LEDs for feedback
   // fp = fopen("/local/log.txt", "a"); // open 'log.txt' for appending
    // if the file doesn't exist it is created, if it exists, data is appended to the end
    //fprintf(fp,"SESSION START:\n"); // print initial string to file
    //fclose(fp); // close file
    //fileLeds = 0; // turn off LEDs to signify file access has finished
}
    

void FILEWRITE::writeDataToFile(char fileData[])
{
    fileLeds = 15; // turn on LEDs for feedback   //IT GETS STUCK HERE!!!!!!!!!!!!!
    fp = fopen("/local/log.txt", "a"); // open 'log.txt' for appending
    // if the file doesn't exist it is created, if it exists, data is appended to the end
    fprintf(fp,"%s\n",fileData); // print string to file
    fclose(fp); // close file
    fileLeds = 0; // turn off LEDs to signify file access has finished
}
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