#include <stdio.h>
#include <conio.h>
#include <target.h>
#define LED 0x10000 // LED =P0.16
/*
* The watchdog restarts the program every 10 seconds unless
* a key is pressed which resets the timeout. The counter is
* clocked with pclk/4 i.e. one second equals pclk/4 counts.
*
* The LED lights when there are less than 3s until restart.
*/
int
main(void)
{
puts(Intern_wdmod&4? "\nRESTART (watchdog reset)\7\n" // start
: "\nSTART (external reset)\n"); // message
Intern_wdtc = _PCLK/4*10; // 10s timeout (pclk/4 =1s)
Intern_wdmod = 3; // enable watchdog reset
Intern_wdfeed = 0xaa; // start
Intern_wdfeed = 0x55; // watchdog
while (1) {
Intern_iodir &= ~LED; // LED off
puts("Restart in 10s... (hit any key to reset timeout!)");
while (!kbhit()) if (Intern_wdtv < _PCLK/4*3) Intern_iodir |= LED; // < 3s? LED on
getch(); // remove pending char
Intern_wdfeed = 0xaa; // reset
Intern_wdfeed = 0x55; // timeout
}
}
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