WDT — 看门狗复位

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#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"

int main(void)
{
  system_clock_config();

  at32_board_init();

  if(crm_flag_get(CRM_WDT_RESET_FLAG) != RESET)
  {
    /* reset from wdt */
    crm_flag_clear(CRM_WDT_RESET_FLAG);

    at32_led_on(LED4);
  }
  else
  {
    /* reset from other mode */
    at32_led_off(LED4);
  }

  /* disable register write protection */
  wdt_register_write_enable(TRUE);

  /* set the wdt divider value */
  wdt_divider_set(WDT_CLK_DIV_4);

  /* set reload value

   timeout = reload_value * (divider / lick_freq )    (s)

   lick_freq    = 40000 Hz
   divider      = 4
   reload_value = 3000

   timeout = 3000 * (4 / 40000 ) = 0.3s = 300ms
  */
  wdt_reload_value_set(3000 - 1);

  /* reload wdt counter */
  wdt_counter_reload();
  
  /* enable wdt */
  wdt_enable();

  while(1)
  {
    /* reload wdt counter */
    wdt_counter_reload();

    at32_led_toggle(LED3);

    delay_ms(200);

    if(at32_button_press() == USER_BUTTON)
    {
      while(1);
    }
  }
}