main.cpp

00001 #include "mbed.h"
00002 
00003 SPI spi(PTD6, PTD7, PTD5); // mosi, miso, sclk
00004 DigitalOut cs(D9);
00005 
00006 
00007 int main() 
00008 {
00009  
00010  
00011  
00012    // Setup the spi for 8 bit data, high steady state clock,
00013     // second edge capture, with a 1MHz clock rate
00014     spi.format(8,3);
00015     spi.frequency(3000000);
00016 
00017     cs = 0;
00018     spi.write(0x80);  // set write register to seconds
00019     spi.write(0x01);  // send value of zero
00020     
00021     cs=1;
00022     cs=0;
00023      spi.write(0x81);  
00024     spi.write(0x58);   //write reg to minutes
00025     
00026     cs=1;
00027     cs=0;
00028     
00029     spi.write(0x82);  
00030     spi.write(0x01);  //write reg to hours (00-23)
00031     
00032     cs=1;
00033     cs=0;
00034     
00035     spi.write(0x83);  
00036     spi.write(0x01);  //write reg to day (1-7)
00037     
00038     cs=1;
00039     cs=0;
00040     
00041     spi.write(0x84);  
00042     spi.write(0x01);  //write reg to date(01-31)
00043     
00044     cs=1;
00045     cs=0;
00046     
00047     spi.write(0x85);  
00048     spi.write(0x01);  //write reg to mnth(01-12)
00049     
00050     cs=1;
00051     cs=0;
00052     
00053     spi.write(0x86);  
00054     spi.write(0x01);  //write reg to year(00-99)
00055 
00056     cs=1;
00057     // Receive the contents of the seconds register
00058    
00059    for(int i=0;i<1000000;i++){
00060     
00061         
00062     cs=0;
00063     spi.write(0x00);                 // set read register to seconds
00064     int seconds = spi.write(0x00);   // read the value by sending dummy byte
00065     
00066     cs=1;
00067     cs=0;
00068     
00069     spi.write(0x01);
00070     int minutes =spi.write(0x01);
00071     
00072     cs=1;
00073     cs=0;
00074     
00075     spi.write(0x02);
00076     int hours =spi.write(0x01);
00077     
00078     cs=1;
00079     cs=0;
00080     
00081     spi.write(0x03);
00082     int day =spi.write(0x01);
00083     
00084     cs=1;
00085     cs=0;
00086     
00087     spi.write(0x04);
00088     int date =spi.write(0x01);
00089     
00090     cs=1;
00091     cs=0;
00092     
00093     spi.write(0x05);
00094     int mnth =spi.write(0x01);
00095     
00096     cs=1;
00097     cs=0;
00098     
00099     spi.write(0x06);
00100     int year =spi.write(0x01);
00101     
00102     //This cs=1 is to make the chipselect line high to "deselect" the slave in our case RTC
00103     cs = 1;
00104     
00105     //This printf function is to check the timestamp function in the terminal output
00106     printf("timestamp as  = %X : %X : %X : %X : %X : %X : %X\n\r", year,mnth,date,day,hours,minutes,seconds);
00107     }
00108     
00109     
00110     
00111     return 0;
00112     
00113     }