跑一下SAM4N例程(十一)：WDT中断

/**

 *  \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);

}

 /* Restart watchdog at the given period. */

                        if ((g_ul_ms_ticks % WDT_RESTART_PERIOD) == 0) {

                                wdt_restart(WDT);

                        }

/* 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");

}