Diff: main.cpp

Revision:

0:947209d21c35

Child:

1:f37bf2328d79

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jan 18 20:08:29 2018 +0000
@@ -0,0 +1,53 @@
+#include "mbed.h"
+
+DigitalOut redLed(p21); 
+DigitalIn pb(p8); // Pushbutton for redLed
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+
+void kick() {
+    LPC_WDT->WDFEED = 0xAA;
+    LPC_WDT->WDFEED = 0x55;
+}
+
+void kick(float s) {
+    LPC_WDT -> WDCLKSEL = 0x1;
+    uint32_t clk = SystemCoreClock/16;
+    LPC_WDT->WDTC = s * (float)clk;
+    LPC_WDT->WDMOD = 0x3;
+    kick();
+}
+
+
+
+int main() {
+    int count = 0;
+    // Use internal pullup for pushbutton
+    pb.mode(PullUp);
+    
+    // Delay for initial pullup to take effect
+    wait(.001);
+
+    // Indicate watchdog timer reset or pushbutton reset
+    if((LPC_WDT->WDMOD >> 2) & 1) {
+        led1 = 1;
+    } else {
+        led2 = 1;
+    }
+    
+    kick(5); // 5 second timeout
+    while(1) {
+        redLed = !pb;
+        led3 = 1;
+        // Simulate a fault lockup with infinite loop after 10 iterations
+        if (count == 1000000) {
+            while(1){
+            
+            }
+        }
+        led3 = 0; // led will stay on during fault
+        count++;
+        kick();            
+    }
+}
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