Igor Galarraga
Completion of http://mbed.org/users/simon/programs/WatchdogExample
Revision 0:f6684fa81520, committed 2012-04-21
- Comitter:
- IgorGZ
- Date:
- Sat Apr 21 14:38:29 2012 +0000
- Commit message:
- WatchdogExample with power up state detect.
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 Sat Apr 21 14:38:29 2012 +0000
@@ -0,0 +1,53 @@
+#include "mbed.h"
+
+DigitalOut led(LED1);
+
+class Watchdog {
+public:
+ void kick(float s) {
+ LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK
+ uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
+ LPC_WDT->WDTC = s * (float)clk;
+ LPC_WDT->WDMOD = (LPC_WDT->WDMOD|0x3); // Enabled and Reset, without clear WD time-out flag.
+ kick();
+ }
+
+ void kick() {
+ LPC_WDT->WDFEED = 0xAA;
+ LPC_WDT->WDFEED = 0x55;
+ }
+
+ /* You only can do IsWatchdogReset once... because flag must be cleared. */
+ bool IsWatchdogReset() {
+ if (LPC_WDT->WDMOD & 0x4) {
+ LPC_WDT->WDMOD=(LPC_WDT->WDMOD&(~0x4)); /* Clear timeout flag. */
+ return true;
+ }
+ else return false;
+ }
+};
+
+Watchdog w;
+
+int main() {
+ /* First activate WD */
+ w.kick(2.5);
+
+ printf("Hello World!\n");
+
+ if (w.IsWatchdogReset())
+ printf("MAIN: WD RESET Power up!!\r\n");
+
+ int hang = 0;
+ while(1) {
+ printf("loop...\n");
+ wait(0.1);
+
+ if(hang == 10) {
+ while(1);
+ }
+
+ w.kick();
+ hang++;
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Apr 21 14:38:29 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0