WatchdogExample - A very basic example using the watchdog timer

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A very basic example using the watchdog timer

main.cpp@0:8da3c40a4505, 2010-02-17 (annotated)

User	Revision	Line number	New contents of line
simon	0:8da3c40a4505	1	#include "mbed.h"
simon	0:8da3c40a4505	2
simon	0:8da3c40a4505	3	DigitalOut led(LED1);
simon	0:8da3c40a4505	4
simon	0:8da3c40a4505	5	class Watchdog {
simon	0:8da3c40a4505	6	public:
simon	0:8da3c40a4505	7	void kick(float s) {
simon	0:8da3c40a4505	8	LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK
simon	0:8da3c40a4505	9	uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
simon	0:8da3c40a4505	10	LPC_WDT->WDTC = s * (float)clk;
simon	0:8da3c40a4505	11	LPC_WDT->WDMOD = 0x3; // Enabled and Reset
simon	0:8da3c40a4505	12	kick();
simon	0:8da3c40a4505	13	}
simon	0:8da3c40a4505	14
simon	0:8da3c40a4505	15	void kick() {
simon	0:8da3c40a4505	16	LPC_WDT->WDFEED = 0xAA;
simon	0:8da3c40a4505	17	LPC_WDT->WDFEED = 0x55;
simon	0:8da3c40a4505	18	}
simon	0:8da3c40a4505	19	};
simon	0:8da3c40a4505	20
simon	0:8da3c40a4505	21	Watchdog w;
simon	0:8da3c40a4505	22
simon	0:8da3c40a4505	23	int main() {
simon	0:8da3c40a4505	24	printf("Hello World!\n");
simon	0:8da3c40a4505	25	w.kick(2.5);
simon	0:8da3c40a4505	26
simon	0:8da3c40a4505	27	int hang = 0;
simon	0:8da3c40a4505	28	while(1) {
simon	0:8da3c40a4505	29	printf("loop...\n");
simon	0:8da3c40a4505	30	wait(0.1);
simon	0:8da3c40a4505	31
simon	0:8da3c40a4505	32	if(hang == 10) {
simon	0:8da3c40a4505	33	while(1);
simon	0:8da3c40a4505	34	}
simon	0:8da3c40a4505	35
simon	0:8da3c40a4505	36	w.kick();
simon	0:8da3c40a4505	37	hang++;
simon	0:8da3c40a4505	38	}
simon	0:8da3c40a4505	39	}