Diff: main.cpp

Revision:

0:93e3779ebc48

Child:

1:c0b9e466e9e5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Apr 09 23:38:25 2017 +0000
@@ -0,0 +1,53 @@
+#include "mbed.h"
+
+#define PRREG(z) printf(#z" 0x%x\n",z)
+Timer tmr;
+
+void wdog_init() {
+    __disable_irq();
+    WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xC520); /* Key 1 */
+    WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xD928); /* Key 2 */
+    __NOP();
+    __NOP();
+
+    WDOG_TOVALL = (4000); // The next 2 lines sets the time-out value. This is the value that the watchdog timer compare itself to.
+    WDOG_TOVALH = 0;
+    WDOG_STCTRLH = (WDOG_STCTRLH_ALLOWUPDATE_MASK | WDOG_STCTRLH_WDOGEN_MASK | WDOG_STCTRLH_WAITEN_MASK | WDOG_STCTRLH_STOPEN_MASK); // Enable WDG
+    WDOG_PRESC = 0; // prescaler 
+    __enable_irq();
+}
+
+void kick() {
+     __disable_irq();
+    WDOG_REFRESH = 0xA602;
+    WDOG_REFRESH = 0xB480;
+    __enable_irq();
+}
+
+int main() {
+    int i,fbus,flashbus;
+    fbus = SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV2_MASK) >> SIM_CLKDIV1_OUTDIV2_SHIFT) + 1);
+    flashbus = SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV4_MASK) >> SIM_CLKDIV1_OUTDIV4_SHIFT) + 1);
+    printf("\nSystemCoreClock %d fbus %d flash %d %s %s\n",SystemCoreClock,fbus,flashbus,__TIME__,__DATE__);
+    PRREG(WDOG->STCTRLH);
+    PRREG(WDOG->PRESC);
+    PRREG(WDOG->TOVALL);
+    PRREG(WDOG->TOVALH);
+    PRREG(WDOG->RSTCNT);
+    wdog_init();
+    PRREG(WDOG->STCTRLH);
+    PRREG(WDOG->PRESC);
+    PRREG(WDOG->TOVALL);
+    PRREG(WDOG->TOVALH);
+    PRREG(WDOG->RSTCNT);
+    wait_ms(100);
+    kick();
+    for (i=1;i<=3; i++) {
+        printf("running %d\n",i);
+        wait(1.0);
+        kick();
+    }
+    printf("long wait reset\n");
+    wait(5.0);
+    printf("never happen\n");
+}
\ No newline at end of file