taku hachisu / Watchdog

Watchdog timer for LPC1549

Diff: Watchdog.cpp

Revision:
0:35b88129a223
Child:
2:c72a3d9002d5
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Watchdog.cpp	Fri Nov 10 06:24:43 2017 +0000
@@ -0,0 +1,27 @@
+/**
+ * @file    Watchdog.cpp
+ * @brief   Watchdog for LPC1549
+ * @author  taku hachisu
+ * @date    2017/11/02
+ */
+
+#include "mbed.h"
+#include "Watchdog.h"
+
+Watchdog::Watchdog(int ms)
+{
+    timeOutFlag = (LPC_WWDT->MOD >> 2) & 1;
+    LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 22);
+    LPC_SYSCON->PDRUNCFG &= ~(1 << 20);
+    LPC_SYSCON->STARTERP0 |= 1;
+    uint32_t clk = 503000 / 4;                          // LPC1549's watchdog oscillator is fixed to 503 kHz
+    LPC_WWDT->TC = ((float)ms * (float)clk) / 1000;
+    LPC_WWDT->MOD = 0x03;
+    feed();
+}
+
+void Watchdog::feed()
+{
+    LPC_WWDT->FEED = 0xAA;
+    LPC_WWDT->FEED = 0x55;
+}
\ No newline at end of file