File content as of revision 0:f7cd934498e4:

#include "mbed.h"
#include "MODSERIAL.h"
#include "SDFileSystem.h"


////////////////////Declarations////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////

AnalogIn fcs(PTB2);     // force sensor output connected to analog 0

DigitalOut r_led(LED_RED);
DigitalOut g_led(LED_GREEN);
DigitalOut b_led(LED_BLUE);


MODSERIAL pc(USBTX,USBRX, 1024, 512);
SDFileSystem sd(PTE3, PTE1, PTE2, PTE4, "sd"); // MOSI, MISO, SCK, CS
FILE *fp;

Ticker tick;

const int baudrate = 115200;      // baud rate
const float Ts = 0.005;           // sample time (sec)

const int led_on = 0;
const int led_off = 1;

volatile bool fn1_go = 0;                // go-flag starts in disabled state
volatile bool start = 0;

float fcs_read;


int trial_numb = 0;
int cal_numb = 1;

char filename[64];



////////////////////Functions///////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////

void led_control(bool r, bool g, bool b)    // control rgb LEDs
{
    r_led.write(r);
    g_led.write(g);
    b_led.write(b);
    return;
}

void fn1_activate()     // function called by ticker every Ts seconds
{
    fn1_go = 1;      // go-flag active
}


////////////////////Main////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////

int main()
{
    pc.baud(baudrate);
    tick.attach(&fn1_activate,Ts);
    led_control(led_off,led_off,led_off);   // start with LEDs off

    while (1) {
        if(fn1_go) {                        // statements to execute when go-flag is active
            fn1_go = 0;

        }

        if(pc.readable()) {                 // if character available
            switch(pc.getc()) {             // read a character from keyboard
                case 'c':
                    led_control(led_on,led_on,led_off);                     //orange LED during calibration
                    sprintf(filename, "/sd/cal_torque_%d.txt", cal_numb);   //construct new textfile
                    fp = fopen(filename, "w");
                    if(fp == NULL) {
                        error("Could not open file for write\n");
                    } else {
                        while(1) {
                            for (int i = 0; i<50; i++) {                    //get 50 samples from torque sensor
                                fcs_read = fcs.read();
                                fprintf(fp, "%.3f\t \n\r", fcs_read);       //output values to the screen
                            }
                            break;
                        }
                    }
                    fclose(fp);                                             //close file
                    cal_numb++;                                             //increment calibration number
                    pc.printf("File saved as %s\n\r", filename);            //print name of calibration file to screen
                    pc.printf("Press 'c' to record new calibration or 't' to start new trial\n\r");    // print message to screen
                    break;
                case 't':
                    trial_numb++;
                    pc.printf("Trial number: %d\n\r", trial_numb);
                    pc.printf("Press 's' to start measurement\n\r");
                    break;
                case 's':
                    start = !start;
                    if (start) {
                        led_control(led_off,led_on,led_off);                        //green LED during calibration
                        sprintf(filename_torque, "/sd/trial%d.txt", trial_numb);    //construct new textfile to store data from torque sensor
                        fp = fopen(filename_torque, "w");
                        if(fp == NULL) {
                            error("Could not open file for write\n\r");
                        } else {
                            pc.printf("Measurement started... \n\r");
                            pc.printf("Press 's' to stop measurement\n\r");
                            while(1) {
                                fcs_read = fcs.read();
                                fprintf(fp, "%.3f\t \n\r", fcs_read);
                            }
                            break;
                        }

                        break;
                    } else {
                        led_control(led_on,led_off,led_off);                                  // RED LED when ready to stopped measuring
                        fclose(fp);
                        pc.printf("File saved as %s\n\r", filename_torque);                                // print filename to screen
                        pc.printf("Press 'c' to perform new calibration or 't' to start new trial\n\r");    // print message to screen                   

                    }
                    break;
            }
        }
    }
}