Gopi Sundaresan / Mbed 2 deprecated SDFileSystem

Solar Cell Powered - Periodic logging of sensor data into SD card

Dependencies:   mbed

main.cpp@0:248aa51eeb12, 2011-02-28 (annotated)

Committer:
gsundaresan3
Date:
Mon Feb 28 20:05:48 2011 +0000
Revision:
0:248aa51eeb12

        

        
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#include "string.h"





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#include "mbed.h"





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#include "SDFileSystem.h"





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#include "PowerControl.h"





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#include "EthernetPowerControl.h"





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AnalogIn ain(p20);





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DigitalOut sensor(p15);





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Serial pc(p28, p27);





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SDFileSystem sd(p5, p6, p7, p8, "sd"); 





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#define USR_POWERDOWN    (0x104)





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int semihost_powerdown() {





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    uint32_t arg;





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    return __semihost(USR_POWERDOWN, &arg);





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}





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Ticker sense; // Ticker to Interrupt the sleeping mode





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Timer t;





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void sd_write_read() {





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    char data[100];





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    int time_stamp;





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    time_stamp=t.read();





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    sensor=1;   /* Power up Sensor only when necessary */





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    pc.printf("\n Writing into SD card... \n");





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    pc.printf("\n Writing Sensor Data... \n");





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    mkdir("/sd/mydir", 0777);





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    /* Following code does a conditional check on analog in to determine the distance from IR Sensor */





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    if (ain < 0.3) {





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        strcpy(data,"Its approximately 30 cm away");





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    } else if (ain > 0.3&&ain < 0.5) {





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        strcpy(data,"Its approximately 20 cm away");





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    } else if (ain>0.5 && ain < 0.6) {





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        strcpy(data,"Its approximately 15 cm away");





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    } else {





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        strcpy(data,"Its approximately 10 cm away");





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    }





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    /* Open the File for writing into the SD Card */





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    FILE *fp = fopen("/sd/mydir/sdtest.txt", "a");





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    if (fp == NULL) {





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        error("Could not open file for write\n");





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    }





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    fprintf(fp, "%d : %s \n",time_stamp,data);  /* Record Sensor data along with time stamp */





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    fclose(fp);





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    sensor=0;   /* Power down Sensor after data is logged */





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}





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int main() {





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    int result; 





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    PHY_PowerDown();                    /* PHY Powerdown */





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    result = semihost_powerdown();      /* Semihost Powerdown */





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    sense.attach(&sd_write_read, 5);    /* Excecute sd_write_read function every 5s */





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    t.start();                          /* Start of timer to record Time Stamp */





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    while (1) {





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        Sleep();                        /* Sleep mode to save power */





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    }





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}





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