Diff: wdt.cpp

Revision:

17:67a6b557eda5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wdt.cpp	Fri Sep 19 16:40:17 2014 +0000
@@ -0,0 +1,24 @@
+#include "mbed.h"
+#include "wdt.h"
+ 
+ /// Watchdog gets instantiated at the module level
+Watchdog::Watchdog() {
+    wdreset = (LPC_WDT->MOD >> 2) & 1;    // capture the cause of the previous reset
+}
+ 
+/// Load timeout value in watchdog timer and enable
+void Watchdog::Configure(float s) {
+    //LPC_WDT->CLKSEL = 0x1;                // Set CLK src to PCLK
+    uint32_t clk = 500000 / 4;    // WD has a fixed /4 prescaler, and a 500khz oscillator
+    LPC_WDT->TC = (uint32_t)(s * (float)clk);
+    LPC_WDT->MOD = 0x3;                   // Enabled and Reset
+    kick();
+}
+ 
+/// "Service", "kick" or "feed" the dog - reset the watchdog timer
+/// by writing this required bit pattern
+void Watchdog::kick() {
+    LPC_WDT->FEED = 0xAA;
+    LPC_WDT->FEED = 0x55;
+}
+ 
\ No newline at end of file