xtest18_1.c

来自「AT91sam7s 256 B/D example」· C语言 代码 · 共 54 行

/* ========================================================================== */
/*		Xtest18_1.c : Watchdog Timer Test(1) - Reset		      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

#include "AT91SAM7S256.h"
#include "lib_AT91SAM7S256.h"
#include "OK7S256ads.h"

int main(void)
{ unsigned int mode=0;

  MCU_initialize();				// initialize AT91SAM7S256 & kit
  Delay_ms(50);					// wait for system stabilization
  LCD_initialize();				// initialize text LCD module

  LCD_string(0x80," OK-7S256  V1.0 ");		// display title
  LCD_string(0xC0," Watchdog Reset ");
  Beep();

  LED_on(LED2 | LED1);				// blink LED2 and LED1
  Delay_ms(1000);
  LED_off(LED2 | LED1);

  AT91F_WDTC_CfgPMC();				// enable peripheral clock for WDT
  *AT91C_WDTC_WDMR = 0x30002000 | (51 << 16) | 51; // enable watchdog reset
						// WDD=WDV=51 for 200ms

  while(1)
    { LCD_string(0x80," KEY1 = 100 ms  ");	// display title
      LCD_string(0xC0," KEY2 = 300 ms  ");

      switch(Key_input())                       // key input
        { case 1 : mode = 1;			// if KEY1, mode=1
                   break;
          case 2 : mode = 2;			// if KEY2. mode=2
                   break;
          default: if(mode == 0)
                     { AT91F_WDTRestart(AT91C_BASE_WDTC); // restart WDT
                       break;
                     }
                   LED_on(LED2);		     // if mode=1, 100ms interval
                   if(mode == 1)      Delay_ms(100); // if mode=2, 300ms interval
                   else if(mode == 2) Delay_ms(300);
                   AT91F_WDTRestart(AT91C_BASE_WDTC); // restart WDT
                   LED_off(LED2);
                   if(mode == 1)      Delay_ms(100);
                   else if(mode == 2) Delay_ms(300);
                   AT91F_WDTRestart(AT91C_BASE_WDTC); // restart WDT
                   break;
        }
    }
}