Johnny Yam
DS1306 RTC testing. set time to 4:44:30PM and set alarm for 4:44:44PM
Revision 0:883734dc25da, committed 2012-06-01
- Comitter:
- jyam
- Date:
- Fri Jun 01 00:00:14 2012 +0000
- Commit message:
- initial release
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 Fri Jun 01 00:00:14 2012 +0000
@@ -0,0 +1,144 @@
+#include "mbed.h"
+
+DigitalOut ce(p14);
+SPI spi(p11, p12, p13);
+Serial pc(USBTX, USBRX); // tx, rx
+InterruptIn ir(p15);
+//DigitalIn alm(p15);
+DigitalOut myled(LED1);
+
+
+void detect() {
+ pc.printf("Interrupt received\n");
+ myled = 0;
+ // exit(0);
+}
+
+int main() {
+ myled = 1;
+ ir.fall(&detect);
+ unsigned char response;
+ ce=0;
+ pc.printf("Start\n");
+ spi.format(8,3); // DS1306 RTC supports mode 3 and 1
+ spi.frequency(1000000);
+
+ // set control register to enable write and enable alarm interrupts
+ ce = 1;
+ spi.write(0x8f);
+ spi.write(0x07);
+ ce = 0;
+ wait(1);
+
+ // set time to 4:44:30PM
+
+ // set seconds to 30
+ ce = 1;
+ spi.write(0x80);
+ spi.write(0x30);
+ ce = 0;
+ wait(1);
+
+ // set minutes to 44
+ ce = 1;
+ spi.write(0x81);
+ spi.write(0x44);
+ ce = 0;
+ wait(1);
+
+ // set to 12-hr mode, PM, and hour to 4
+ ce = 1;
+ spi.write(0x82);
+ spi.write(0x64);
+ ce = 0;
+ wait(1);
+
+ // read seconds
+ ce = 1;
+ spi.write(0x00);
+ response = spi.write(0x00);
+ ce = 0;
+ wait(1);
+ printf("seconds: %x\n", response);
+
+ // read minutes
+ ce = 1;
+ spi.write(0x01);
+ response = spi.write(0x01);
+ ce = 0;
+ wait(1);
+ printf("minute: %x\n", response);
+
+ // read what u wrote at that location (0x64: 12-hr mode, PM, and hour to 4)
+ ce = 1;
+ spi.write(0x02);
+ response = spi.write(0x02);
+ ce = 0;
+ wait(1);
+ printf("%x\n", response);
+
+ // read seconds again (see if time incremented)
+ ce = 1;
+ spi.write(0x00);
+ response = spi.write(0x00);
+ ce = 0;
+ wait(1);
+ printf("seconds: %x\n", response);
+
+ // set alarm to 4:44:44PM
+
+ // set seconds to 44
+ ce = 1;
+ spi.write(0x87);
+ spi.write(0x44);
+ ce = 0;
+ wait(1);
+
+ // set minutes to 44
+ ce = 1;
+ spi.write(0x88);
+ spi.write(0x44);
+ ce = 0;
+ wait(1);
+
+ // set to 12-hr mode, PM, and hour to 4
+ ce = 1;
+ spi.write(0x89);
+ spi.write(0x64);
+ ce = 0;
+ wait(1);
+
+ // set alarm to not match day
+ ce = 1;
+ spi.write(0x8a);
+ spi.write(0x80);
+ ce = 0;
+ wait(1);
+
+ // read time seconds
+ ce = 1;
+ spi.write(0x00);
+ response = spi.write(0x00);
+ ce = 0;
+ wait(1);
+ printf("seconds: %x\n", response);
+
+ // enable alarm
+ ce = 1;
+ spi.write(0x8f);
+ spi.write(0x07);
+ ce = 0;
+ wait(1);
+
+ while (true) {
+ // read time seconds
+ ce = 1;
+ spi.write(0x00);
+ response = spi.write(0x00);
+ ce = 0;
+ printf("seconds: %x\n", response);
+ wait(1);
+ }
+
+ return 0;
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Jun 01 00:00:14 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/737756e0b479