File content as of revision 2:c38929a198a7:

#include "rtc_tst.h"
#include "string.h"

SPI spi(PTD6, PTD7, PTD5); // mosi, miso, sclk
DigitalOut cs(D9);


char* Getts()
    {

    // Setup the spi for 8 bit data, high steady state clock,
    // second edge capture, with a 1MHz clock rate
    spi.format(8,3);
    spi.frequency(1000000);

    cs = 0;
    spi.write(0x80);  // set write register to seconds
    spi.write(0x00);  // send value of zero
    
    //cs=1;
    //cs=0;
     spi.write(0x81);  
    spi.write(0x00);   //write reg to minutes
    
    //cs=1;
    //cs=0;
    
    spi.write(0x82);  
    spi.write(0x00);  //write reg to hours (00-23)
    
    spi.write(0x83);  
    spi.write(0x00);  //write reg to day (1-7)
    
    spi.write(0x84);  
    spi.write(0x00);  //write reg to date(01-31)
    
    spi.write(0x85);  
    spi.write(0x00);  //write reg to mnth(01-12)
    
    spi.write(0x86);  
    spi.write(0x00);  //write reg to year(00-99)
    
    cs=1;
    // Receive the contents of the seconds register
   
   
    
        
    cs=0;
    spi.write(0x00);                 // set read register to seconds
    int seconds = spi.write(0x00);   // read the value by sending dummy byte
    
    //cs=1;
    //cs=0;
    
    spi.write(0x01);
    int minutes =spi.write(0x01);
    
    //cs=1;
    //cs=0;
    
    spi.write(0x02);
    int hours =spi.write(0x01);
    
    spi.write(0x03);
    int day =spi.write(0x01);
    
    spi.write(0x04);
    int date =spi.write(0x01);
    
    spi.write(0x05);
    int month =spi.write(0x01);
    
    spi.write(0x06);
    int year =spi.write(0x01);
    
    //This cs=1 is to make the chipselect line high to "deselect" the slave in our case RTC
    cs = 1;
    
    //This printf function is to check the timestamp function in the terminal output
    printf("timestamp as  = %X : %X : %X : %X : %X : %X : %X\n\r", hours,minutes,seconds,day,date,month,year);
    
    
    printf("b4 returning tmpstmp is : %s\n",getname(year,month,date,day,hours,minutes,seconds));
    return(getname(year,month,date,day,hours,minutes,seconds));
    
    
    }
    
    
    
    
    
    
    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 y[3]=getstr(year);
    char m[3]=getstr(month);
    char dat[3]=getstr(date);
    char da[3]=getstr(day);
    char h[3]=getstr(hours);
    char mi[3]=getstr(minutes);
    char s[3]=getstr(seconds);*/
    char time[15];
    sprintf(time,"%2d%2d%2d%2d%2d%2d%2d",year1,month1,date1,day1,hours1,minutes1,seconds1);
    return(time);
    
}
 
int hexint(int a)
{
    a=(a/16)*10+(a%16);
    return a;
}