n r
/
WatchdogTimer
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Diff: WatchdogTimer.cpp
- Revision:
- 0:f39b85bbe46f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WatchdogTimer.cpp Sun Sep 02 14:54:58 2012 +0000
@@ -0,0 +1,30 @@
+#include "mbed.h"
+#include "WatchdogTimer.h"
+
+WatchdogTimer::WatchdogTimer()
+{
+}
+
+void WatchdogTimer::enable(float timeout)
+{
+ // Set the clock source (use peripheral clock)
+ LPC_WDT->WDCLKSEL = 0x1;
+ // Set the watchdog timer constant (watchdog prescaler is always 1/4, PCLK default is 1/4)
+ LPC_WDT->WDTC = timeout * SystemCoreClock / (4.0 * 4.0);
+ // Enable and reset (WDEN | WDRESET)
+ LPC_WDT->WDMOD = 0x3;
+ feed();
+}
+
+void WatchdogTimer::feed()
+{
+ // Feed sequence is 0xAA, 0x55.
+ LPC_WDT->WDFEED = 0xAA;
+ LPC_WDT->WDFEED = 0x55;
+}
+
+bool WatchdogTimer::causedReset()
+{
+ // Read the watchdog time-out flag (WDTOF).
+ return (LPC_WDT->WDMOD & 0x4);
+}