File content as of revision 5:ac633cdbb75c:

#include "mbed.h"
#include "SDFileSystem.h"    // SD file system header from handbook/cookbook offical mbed library
#include "MODSERIAL.h"   
#include "UM6_usart.h"     // UM6 USART HEADER
#include "UM6_config.h"    // UM6 CONFIG HEADER


//------------ system and interface setup ----------------------------//
//////////////////////////////////////LocalFileSystem local("local");  // sets up local file on mbed
MODSERIAL pc(USBTX, USBRX);  // sets up serial connection to pc terminal

//------------ Hardware setup ----------------------------------------//
DigitalOut pc_led(LED1);    // LED1 = PC SERIAL
DigitalOut uart_led(LED2);  // LED2 = UM6 SERIAL
DigitalOut log_led(LED3);    // debug LED
DigitalIn enable(p10);    // enable signal for logging data to file
SDFileSystem sd(p5, p6, p7, p8, "sd"); // the pinout on the mbed Cool Components workshop board


//------------ interrupt and variable setup --------------------------//
Ticker tick;
Timer t;
int counter=0;
int flag=0;

// interupt function for processing uart messages --------------------//
void rxCallback(MODSERIAL_IRQ_INFO *q) {
    if (um6_uart.rxBufferGetCount() >=  MAX_PACKET_DATA) {
        uart_led = !uart_led;  // Lights LED when uart RxBuff has > 40 bytes
        Process_um6_packet();
    }
}

//------------ LogData interrupt function ----------------------------//
void LogData() {
            counter++;
            flag=1;
} 

//============= Main Program =========================================//
int main() {
    pc.baud(115200);  // baud rate to pc interface
    um6_uart.baud(115200); // baud rate to um6 interface

    t.start(); // start log time

    //---- call interrupt functions -------------------------//
    um6_uart.attach(&rxCallback, MODSERIAL::RxIrq); // attach interupt function to uart
    tick.attach(&LogData, 0.01); // attaches LogData function to 'tick' ticker interrupt every 0.5s
    
    //---------- setup sd card -----------------------------// 
    mkdir("/sd/mydir", 0777);    
    FILE *fp = fopen("/sd/mydir/sdtest.csv", "w");
    if(fp == NULL) {
        error("Could not open file for write\n");
    }
////////////    FILE *fp = fopen("/local/log1.csv", "w");
    fprintf(fp,"time(s),count,Yaw(deg),Accel(m/s2) \r");        

    //---- main while loop ----------------------------------// 
    //--(interrupt sets flag that causes variables to be logged)
    while(1) {
            if(flag==1) {  // prints counter value every interrupt raises flag
                log_led=1;  // turns on LED3 to indicate logging               
                float Yaw=data.Yaw;
                float AccelX=data.Accel_Proc_X;            
                fprintf(fp,"%.3f,%d,%f,%f \r",t.read(),counter,Yaw,AccelX);
                pc.printf("time %.3f, count %d,Yaw %f,Accel %f \n",t.read(),counter,Yaw,AccelX);
                flag=0;
                pc_led = !pc_led;  // Lights LED1 when uart RxBuff has > 40 bytes     
            }    // end if(flag=1) loop
         
            if(enable==0) {
            break;             // breaks while loop in enable switched off
            }
    } // end while(1) loop
    pc.printf(" done. ");  // prints 'done when logging is finished/enable switched off
    log_led=0;             // turns off LED logging is finished/enable switched off
    wait(0.5);             // debug wait for pc.printf      
    fclose(fp);            // closes log file
} // end main() program


/* opening a file BEFORE calling interrupts                         OK
   opening a file and print to it BEFORE calling interrupts         NOT OK (stops rest of program)
   open a (local) file and print to it AFTER calling interrupts     NOT OK (stops rest of program)
   open a (sd) file and print to it AFTER calling interrupts        OK 
*/