main.cpp

00001 #include "mbed.h"
00002 SPI spi(PTD6, PTD7, PTD5); // mosi, miso, sclk
00003 DigitalOut cs(PTD2);
00004 
00005 
00006 int main() 
00007 {
00008  
00009  
00010  
00011     // Setup the spi for 8 bit data, high steady state clock,
00012     // second edge capture, with a 1MHz clock rate
00013     spi.format(8,3);
00014     spi.frequency(1000000);
00015 
00016     // Send the commands to write to test the seconds register
00017     cs = 0;
00018     spi.write(0x80);  // set write register to seconds
00019     spi.write(0x00);  // send value of one
00020     
00021     cs=1;
00022     cs=0;
00023      spi.write(0x81);  //write reg to minutes
00024     spi.write(0x00);
00025     
00026     cs=1;
00027     cs=0;
00028     
00029     spi.write(0x82);  //write reg to minutes
00030     spi.write(0x01);
00031     
00032     cs=1;
00033     
00034     cs = 0;
00035     spi.write(0x83);  // set write register to seconds
00036     spi.write(0x01);  // send value of one
00037     
00038     cs=1;
00039     
00040     cs = 0;
00041     spi.write(0x84);  // set write register to seconds
00042     spi.write(0x01);  // send value of one
00043     
00044     cs=1;
00045     
00046     cs = 0;
00047     spi.write(0x85);  // set write register to seconds
00048     spi.write(0x01);  // send value of one
00049     
00050     cs=1;
00051     
00052     cs = 0;
00053     spi.write(0x86);  // set write register to seconds
00054     spi.write(0x01);  // send value of one
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
00065     
00066     cs=1;
00067     cs=0;
00068     
00069     spi.write(0x01);
00070     int minutes =spi.write(0x00);
00071     
00072     
00073     cs=1;
00074     cs=0;
00075     
00076     spi.write(0x02);
00077     int hours =spi.write(0x01);
00078     cs = 1;  //This cs=1 is to make the chipselect line high to "deselect" the slave in our case RTC
00079     
00080     cs=0;
00081     
00082     spi.write(0x03);
00083     int day =spi.write(0x01);
00084     cs = 1;
00085     
00086     cs=0;
00087     
00088     spi.write(0x04);
00089     int date =spi.write(0x01);
00090     cs = 1;
00091     
00092     cs=0;
00093     
00094     spi.write(0x05);
00095     int month =spi.write(0x01);
00096     cs = 1;
00097     
00098     cs=0;
00099     
00100     spi.write(0x06);
00101     int year =spi.write(0x01);
00102     cs = 1;
00103     
00104     wait(1);
00105     //This printf function is to check the timestamp function in the terminal output
00106     printf("Seconds register = %2X : %2X : %2X : %2X : %2X : %2X : %2X \n\r",year,month,date,day, hours,minutes,seconds);
00107     }
00108     
00109     return 0;
00110     
00111     
00112     
00113     }