main.cpp

00001 #include "mbed.h"
00002 
00003 DigitalOut myled(LED1);
00004 I2C myi2c(PTE0,PTE1);
00005 Serial pc(USBTX,USBRX);
00006 
00007 const int ds1307=0xD0;
00008 char data;
00009 
00010 
00011 int bcd2int(unsigned int bcd)
00012 {
00013     int pos = sizeof(bcd) * 8;
00014     int digit;
00015     int val = 0;
00016 
00017     do {
00018         pos -= 4;
00019         digit = (bcd >> pos) & 0xf;
00020         val = val * 10 + digit;
00021     } while (pos > 0);
00022 
00023     return val;
00024 }
00025 
00026 
00027 
00028 
00029 
00030 int main()
00031 {
00032     int p;
00033     myi2c.frequency(100000);
00034 
00035     myi2c.write(ds1307,0x00,1); // tell the ds1307 we want to talk to address
00036     for(p=0; p<8; p++) {
00037         myi2c.read(ds1307,&data,1); // read one byte into data
00038 
00039         pc.printf("item: %d\t\tread:%d\t \n\r",p,(int)data);
00040         wait(0.01);
00041     }
00042 
00043     pc.printf("\n==========\n\r\nStarting the clock now\n\r");
00044     char cmd[2];
00045     cmd[0]=0;
00046     cmd[1]=0;
00047     myi2c.write(ds1307,cmd,2); // tell the ds1307 we want to talk to address 00
00048 
00049 
00050     while(1) {
00051         myled = 1;
00052         wait(0.8);
00053         myled = 0;
00054 
00055         myi2c.write(ds1307,0x00,1); // tell the ds1307 we want to talk to address 0
00056         for(p=0; p<8; p++) {
00057             myi2c.read(ds1307,&data,1); // read one byte into data
00058 
00059             pc.printf("item: %d\t\tread:%d\t VAL:%d \n\r",p,(int)data,bcd2int(data));
00060             wait(0.01);
00061         }
00062         wait(5);
00063         pc.printf("\n==========================\n\r");
00064     }
00065 }
00066