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Problem with SDcard

Topic last updated 08 Jun 2016, by Stephane SANTAT. 0 replies
Stephane SANTAT
08 Jun 2016

Hi I want to write some data in SDcard but led2 didn't turn on I try the Mbed SDFileSystem main program and it works so my device is ok

Can anyone help me ? Thanks

include the mbed library with this snippet

#include "mbed.h"
#include "SDFileSystem.h"
 
SDFileSystem sd(p5, p6, p7, p8, "sd"); // the pinout on the mbed Cool Components workshop board
AnalogIn capteur(p18);//Lecture de la valeur en sortie de l'ADC
InterruptIn boutonStop(p20);
DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);

Timer tot;
Timer t;
Timeout appel;

float b;
int d,e; 
float buffer_chiffre[2][400];
int indiceBuffer = 0;
float seuilHaut = 0.564;
float seuilBas = 0.558;

void Stop()
{
    led1=0;
    led2=1;
    led3=0;
    led4=0;
    exit(0);
}

void flip() {
    e = 1;
}

int main() 
{
    boutonStop.fall(&Stop);
    led1=1;
    mkdir("/sd/mydir", 0777);
    FILE *fp = fopen("/sd/mydir/sdtest.txt", "w");
    if(fp == NULL) 
    {
        error("Could not open file for write\n");
    }
    fprintf(fp, "temps;a;\r\n");
    led2 = 1;
    led2 = 0;
    led1=0;
    d = 1;
    while (d == 1) 
    {
        tot.start();
        t.start();
        b=capteur.read();
        if (b>seuilHaut || 1-b>seuilBas)//On pose une limite arbitraire qui est 0.57
        {
            led1=1;
            e = 0;
            buffer_chiffre[0][0] = tot.read();
            buffer_chiffre[1][0] = capteur.read();
            appel.attach_us(&flip, 1000);
            while (e!=1)//On fait durer l'acquisition xs après le premier impact pour visualiser la courbe si ADC assez rapide
            {
                indiceBuffer=indiceBuffer+1;
                buffer_chiffre[0][indiceBuffer] = tot.read();
                buffer_chiffre[1][indiceBuffer] = capteur.read();
            }led1=0;
        }
        if (buffer_chiffre[1][indiceBuffer] != 0)
        {
            for (int k = 0; k < 10; k++) 
            {
                led3=1;
                fprintf(fp,"%f;", buffer_chiffre[0][k]);
                led3=0;
                led4=1;
                fprintf(fp,"%f;\r\n", buffer_chiffre[1][k]);
                led4=0;
                indiceBuffer = 0;
            }
        t.stop();
        t.reset();
        }
    }
    fclose(fp);  
}