Diff: Watchdog/watchdog.cpp

Revision:

0:22612ae617a0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Watchdog/watchdog.cpp	Mon Oct 08 11:14:07 2012 +0000
@@ -0,0 +1,32 @@
+#include "mbed.h"
+
+// Loads watchdog timer with TC value
+void feed() {
+    LPC_WWDT->FEED = 0xAA;
+    LPC_WWDT->FEED = 0x55;
+}
+
+// Ref. UM10462.pdf chapter 17
+void WDTInit() {
+    // Power on interface...
+    LPC_SYSCON->SYSAHBCLKCTRL |= (0x1 << 15);
+
+    // Power on watchdog oscillator
+    LPC_SYSCON->PDRUNCFG &= 0x3F;
+
+    // Select watchdog oscillator for WWDT clock source
+    LPC_WWDT->CLKSEL = 0x1;
+
+    uint32_t clk = SystemCoreClock / 16;
+    LPC_WWDT->TC = 0xfff;//10 * clk;
+
+    // Enable WWDT. The timer will not begin until the
+    // proper feed sequence is loaded.
+    LPC_WWDT->MOD = 0x3;
+
+    feed();
+#if 0
+    printf("CLKSEL->0x%x TC->0x%x MOD->0x%x FEED->0x%x\n", LPC_WWDT->CLKSEL, LPC_WWDT->TC, LPC_WWDT->MOD, LPC_WWDT->FEED);
+    printf("clk->%d\n", clk);
+#endif
+}