Wiljan Arias
/
WatchDogTimer
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Revision 0:3744cb611b63, committed 2015-01-03
- Comitter:
- wyunreal
- Date:
- Sat Jan 03 13:26:51 2015 +0000
- Commit message:
- Simple library to manage the WatchDog timer
Changed in this revision
| WatchDogTimer.cpp | Show annotated file Show diff for this revision Revisions of this file |
| WatchDogTimer.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WatchDogTimer.cpp Sat Jan 03 13:26:51 2015 +0000
@@ -0,0 +1,24 @@
+/**
+ * Apache License
+ * Version 2.0, January 2004
+ * http://www.apache.org/licenses/
+ */
+
+#include "WatchDogTimer.h"
+
+int WatchDogTimer::systemResetReason() {
+ return ((LPC_WDT->WDMOD >> 2) & 1) ? SYSTEM_RESET_WATCH_DOG : SYSTEM_RESET_NORMAL;
+}
+
+WatchDogTimer::WatchDogTimer(float seconds) {
+ 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 = seconds * (float)clk; // Load WD Timer Constant with value determined by float s
+ LPC_WDT->WDMOD = 0x3; // Enabled and Reset
+ feed();
+}
+
+void WatchDogTimer::feed() {
+ LPC_WDT->WDFEED = 0xAA;
+ LPC_WDT->WDFEED = 0x55;
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WatchDogTimer.h Sat Jan 03 13:26:51 2015 +0000
@@ -0,0 +1,23 @@
+/**
+ * Apache License
+ * Version 2.0, January 2004
+ * http://www.apache.org/licenses/
+ */
+
+#ifndef WATCH_DOG_TIMER_H
+#define WATCH_DOG_TIMER_H
+
+#include "mbed.h"
+
+class WatchDogTimer {
+public:
+
+ static const int SYSTEM_RESET_NORMAL = 1;
+ static const int SYSTEM_RESET_WATCH_DOG = 2;
+
+ WatchDogTimer(float seconds);
+ void feed();
+ static int systemResetReason();
+};
+
+#endif
\ No newline at end of file