File content as of revision 6:ee97f01e6b7d:

#include "hk.h"
SPI spi(PTD6, PTD7, PTD5);
DigitalOut cs(D6);

SDFileSystem sd(PTD6, PTD7, PTD5, D7,"sd");

Timer t1;
DigitalOut interrupt(D9);
const int addr = 0x20; 
bool ack0;
I2C master (D14,D15); 

 void spiwrite(int a)
    {
        cs=1;
        cs=0;
        spi.write(a);
        spi.write(0x01);
    }
    
    int spiread(int a)
    {
        cs=1;
        cs=0;
        spi.write(a);
        return(spi.write(0x00));
    }
    char* getname(int year1,int month1,int date1,int day1,int hours1,int minutes1,int seconds1)
{
    year1= hexint(year1);
    month1=hexint(month1);
    date1=hexint(date1);
    day1=hexint(day1);
    hours1=hexint(hours1);
    minutes1=hexint(minutes1);
    seconds1=hexint(seconds1);
    char time[15];
    sprintf(time,"%02d%02d%02d%02d%02d%02d%02d",year1,month1,date1,day1,hours1,minutes1,seconds1);
    
    return(time);
    
}

int hexint(int a)
{
    a=(a/16)*10+(a%16);
    return a;
}
//storedata stores the dummy structure in the file with timestamp as the filename in HK directory
void init_rtc(void)
{
    spi.format(8,3);
    spi.frequency(1000000);
    spiwrite(0x80);           //write seconds to 01
    spiwrite(0x81);           //write minutes t0 01
    spiwrite(0x82);           //write hours  to 01
    spiwrite(0x83);           //write day of week to 01
    spiwrite(0x84);           //write day of month to 01
    spiwrite(0x85);           //write month to 01
    spiwrite(0x86);           //write year to 01
}
void storedata(char * data,int length)
{
     
             ack0 =true; 
            
            interrupt = 1;
            t1.start();
            //wait_ms(20);
            ack0 =  master.read(addr|1,data,length);
            t1.stop();
            
            
            if(!ack0)
            {
                    printf("\n master has read %s from slave\n\r",data);
                    
            }
                //master.stop();
            printf("\n%d\n\r",t1.read_us());
            t1.reset();
            
            interrupt=0;
    spi.format(8,3);
    spi.frequency(1000000);

    int seconds=spiread(0x00);     //read seconds
    int minutes =spiread(0x01);    //read minutes
    int hours =spiread(0x02);      //read hours
    int day =spi.write(0x03);      //read day of the week
    int date =spiread(0x04);       //read day of the month
    int month =spiread(0x05);      //read month
    int year =spiread(0x06);       //read year
    cs = 1;
    
    //Assigning dummy values to the structure
    
   /* SensorData Sensor;
    
    printf("Writing dummy values\n");
    strcpy( Sensor.Voltage, "49");
    strcpy( Sensor.Current, "83");
    Sensor.Temperature ='5';
    strcpy( Sensor.PanelTemperature, "4");
    Sensor.Vcell_soc='9';
    Sensor.alerts= '4';
    Sensor.crate='7';
    Sensor.BatteryTemperature='6';      
    Sensor.faultpoll='4';            
    Sensor.faultir='g';              
    Sensor.power_mode='k';           
    strcpy( Sensor.AngularSpeed, "9");
    strcpy(Sensor.Bnewvalue,"6");
    printf("Done writing dummy values\n"); */
    mkdir("/sd/hk", 0777);
    char date2[100]="/sd/hk/";
    strcat(date2,getname(year,month,date,day,hours,minutes,seconds));
    strcat(date2,".txt");
    FILE *fp ;
    fp= fopen(date2, "w");
    if(fp == NULL)
    {
        error("Could not open file for write\n");
    }
    else
    {
    fprintf(fp, "%s ", data);
    fclose(fp);
    printf("%s",getname(year,month,date,day,hours,minutes,seconds));
    }
}