MANOJ NARAYANAN
The program sets the hr/min/sec and run continuously
Revision 0:fca1e63ed338, committed 2016-06-12
- Comitter:
- manojn
- Date:
- Sun Jun 12 11:39:22 2016 +0000
- Commit message:
- RTC DS1307 Sample program
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sun Jun 12 11:39:22 2016 +0000
@@ -0,0 +1,126 @@
+#include "mbed.h"
+
+const int addr=0xD0;
+unsigned char var1,var2,var3,var4,var5,var6;
+int i;
+
+Serial pc(USBTX, USBRX, "pc");
+
+I2C i2c(p28, p27);
+
+void read_rtc_sec()
+{
+ i2c.start();
+ i2c.write(0xD0);
+ i2c.write(0x00);
+
+ i2c.start();
+ i2c.write(0xD1);
+ var1=i2c.read(0x00);
+
+ var2=var1;
+ var1=var1&0x0f;
+ var2=var2>>4;
+ i2c.stop();
+
+ }
+
+void read_rtc_min()
+{
+ i2c.start();
+ i2c.write(0xD0);
+ i2c.write(0x01);
+
+ i2c.start();
+ i2c.write(0xD1);
+ var3=i2c.read(0x00);
+
+ var4=var3;
+ var3=var3&0x0f;
+ var4=var4>>4;
+
+ i2c.stop();
+ }
+
+
+void read_rtc_hrs()
+{
+ i2c.start();
+ i2c.write(0xD0);
+ i2c.write(0x02);
+
+ i2c.start();
+ i2c.write(0xD1);
+ var5=i2c.read(0x00);
+
+ var6=var5;
+ var5=var5&0x0f;
+ var6=var6>>4;
+ var6=var6&0x01;
+
+ i2c.stop();
+ }
+
+void write_rtc_min(unsigned char mn)
+{
+ i2c.start();
+ i2c.write(addr);
+ i2c.write(0x01);
+ i2c.write(mn); //write min
+ i2c.stop();
+
+}
+
+ void write_rtc_sec(unsigned char sc)
+ {
+ i2c.start();
+ i2c.write(addr);
+ i2c.write(0x00);
+ i2c.write(sc); // write sec
+ i2c.stop();
+ }
+
+
+void write_rtc_hrs(unsigned char hr)
+{
+ i2c.start();
+ i2c.write(addr);
+ i2c.write(0x02);
+ i2c.write(hr); //write hrs
+ i2c.stop();
+
+ }
+
+
+int main()
+{
+
+char sec=0x45; // second field value
+char min=0x59; // min field value
+char hrs=0x52; // hrs field value
+
+
+ i2c.frequency(100000);
+ i2c.start();
+ wait(1);
+
+ i2c.start();
+ write_rtc_min(min);
+ write_rtc_sec(sec);
+ write_rtc_hrs(hrs);
+
+
+
+ while(1)
+ {
+ read_rtc_hrs();
+ read_rtc_min();
+ read_rtc_sec();
+
+ pc.printf("Current time = (%d%d:%d%d:%d%d)\n\r",var6,var5,var4,var3,var2,var1);
+
+ wait(1);
+
+ }
+
+ }
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sun Jun 12 11:39:22 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/6c34061e7c34 \ No newline at end of file