打开WDT例程很方使，可以在有开发板和无开发板的情况下都可以打开。
以下是打开后的截图：
这个例程是这样，先配置好串口和看门狗定时及LED管脚定义。
- /**
- * \brief Handler for System Tick interrupt.
- */
- void SysTick_Handler(void)
- {
- /* Set systick event flag (g_b_systick_event) and add 1 to systick. */
- g_b_systick_event = true;
- g_ul_ms_ticks++;
- }
- /**
- * \brief Handler for watchdog interrupt.
- */
- void WDT_Handler(void)
- {
- puts("Enter watchdog interrupt.\r");
- /* Clear status bit to acknowledge interrupt by dummy read. */
- wdt_get_status(WDT);
- /* Restart the WDT counter. */
- wdt_restart(WDT);
- puts("The watchdog timer was restarted.\r");
- }
- /**
- * \brief Handler for Button 1 rising edge interrupt.
- */
- static void button_handler(uint32_t id, uint32_t mask)
- {
- /* Set button event flag (g_b_button_event). */
- if ((PUSHBUTTON_ID == id) && (PUSHBUTTON_MASK == mask)) {
- g_b_button_event = true;
- }
- }
- /**
- * \brief Configure the Console UART.
- */
- static void configure_console(void)
- {
- const usart_serial_options_t uart_serial_options = {
- .baudrate = CONF_UART_BAUDRATE,
- #ifdef CONF_UART_CHAR_LENGTH
- .charlength = CONF_UART_CHAR_LENGTH,
- #endif
- .paritytype = CONF_UART_PARITY,
- #ifdef CONF_UART_STOP_BITS
- .stopbits = CONF_UART_STOP_BITS,
- #endif
- };
- /* Configure console UART. */
- sysclk_enable_peripheral_clock(CONSOLE_UART_ID);
- stdio_serial_init(CONF_UART, &uart_serial_options);
- }
- /**
- * \brief Configure the Pushbutton.
- */
- static void configure_button(void)
- {
- /* Enable the peripheral clock for the push button on board. */
- pmc_enable_periph_clk(PUSHBUTTON_ID);
- /* Configure PIOs as input pins. */
- pio_configure(PUSHBUTTON_PIO, PUSHBUTTON_TYPE, PUSHBUTTON_MASK,
- PUSHBUTTON_ATTR);
- /* Adjust PIO debounce filter parameters. */
- pio_set_debounce_filter(PUSHBUTTON_PIO, PUSHBUTTON_MASK,
- PUSHBUTTON_FILTER_GLITCH_VAULE);
- /* Initialize PIO interrupt handler, interrupt on rising edge. */
- pio_handler_set(PUSHBUTTON_PIO, PUSHBUTTON_ID, PUSHBUTTON_MASK,
- PUSHBUTTON_ATTR, button_handler);
- }
- /**
- * \brief Configure LED.
- */
- static void configure_led(void)
- {
- /* Configure PIOs for LED. */
- pio_configure(LED_PIO, LED_TYPE, LED_MASK, LED_ATTR);
- }
然后正常喂狗
- /* Restart watchdog at the given period. */
- if ((g_ul_ms_ticks % WDT_RESTART_PERIOD) == 0) {
- wdt_restart(WDT);
- }
当有用户按键时，这时就破坏了喂狗，这时转向看门狗的中断程序。
- /* Simulate deadlock when button is pressed. */
- if (g_b_button_event == true) {
- puts("Program enters infinite loop for triggering watchdog interrupt.\r");
- while (1) {
- }
- }
- */
- void WDT_Handler(void)
- {
- puts("Enter watchdog interrupt.\r");
- /* Clear status bit to acknowledge interrupt by dummy read. */
- wdt_get_status(WDT);
- /* Restart the WDT counter. */
- wdt_restart(WDT);
- puts("The watchdog timer was restarted.\r");
- }
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