Zhen Liu
/
HW1_extraA
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Revision 0:d1018730bb52, committed 2015-02-18
- Comitter:
- lzzcd001
- Date:
- Wed Feb 18 14:47:35 2015 +0000
- Commit message:
- Extra problem 1 for HW 1
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Feb 18 14:47:35 2015 +0000
@@ -0,0 +1,53 @@
+#include "mbed.h"
+
+DigitalIn sw(p5);
+DigitalOut led(p10);
+DigitalOut myled1(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut myled4(LED4);
+
+class Watchdog {
+public:
+// Load timeout value in watchdog timer and enable
+ void kick(float s) {
+ LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK
+ uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
+ LPC_WDT->WDTC = s * (float)clk;
+ LPC_WDT->WDMOD = 0x3; // Enabled and Reset
+ kick();
+ }
+// "kick" or "feed" the dog - reset the watchdog timer
+// by writing this required bit pattern
+ void kick() {
+ LPC_WDT->WDFEED = 0xAA;
+ LPC_WDT->WDFEED = 0x55;
+ }
+};
+
+// Setup the watchdog timer
+Watchdog wdt;
+
+int main() {
+ int count = 0;
+ if ((LPC_WDT->WDMOD >> 2) & 1)
+ myled4 = 1; else myled3 = 1;
+
+ wdt.kick(10.0);
+
+ while(1) {
+ if (sw == 1) {
+ led = 1;
+ myled1 = 1;
+ wait(0.2);
+ } else {
+ if (count >= 20) while(1) {};
+ led = 0;
+ myled1 = 0;
+ wait(0.2);
+ }
+ count++;
+ wdt.kick();
+ }
+
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Feb 18 14:47:35 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5 \ No newline at end of file