[Atmel] 用ASF跑SAMD21程序(20)WDT POLLED

/* Configure GCLK generator 4 */

#  define CONF_CLOCK_GCLK_4_ENABLE                true

#  define CONF_CLOCK_GCLK_4_RUN_IN_STANDBY        false

#  define CONF_CLOCK_GCLK_4_CLOCK_SOURCE          GCLK_SOURCE_OSCULP32K

#  define CONF_CLOCK_GCLK_4_PRESCALER             1

#  define CONF_CLOCK_GCLK_4_OUTPUT_ENABLE         false

/**

 * \file

 *

 * \brief Empty user application template

 *

 */



/**

 * \mainpage User Application template doxygen documentation

 *

 * \par Empty user application template

 *

 * This is a bare minimum user application template.

 *

 * For documentation of the board, go \ref group_common_boards "here" for a link

 * to the board-specific documentation.

 *

 * \par Content

 *

 * -# Include the ASF header files (through asf.h)

 * -# Minimal main function that starts with a call to system_init()

 * -# Basic usage of on-board LED and button

 * -# "Insert application code here" comment

 *

 */



/*

 * Include header files for all drivers that have been imported from

 * Atmel Software Framework (ASF).

 */



void configure_wdt(void);

#include <asf.h>







void configure_wdt(void)

{

    /* Create a new configuration structure for the Watchdog settings and fill

     * with the default module settings. */

    struct wdt_conf config_wdt;

    wdt_get_config_defaults(&config_wdt);

    /* Set the Watchdog configuration settings */

    config_wdt.always_on      = false;

    config_wdt.clock_source   = GCLK_GENERATOR_4;

    config_wdt.timeout_period = WDT_PERIOD_2048CLK;

    /* Initialize and enable the Watchdog with the user settings */

    wdt_set_config(&config_wdt);

}



int main (void)

{

        system_init();

        configure_wdt();



         enum system_reset_cause reset_cause = system_get_reset_cause();

         if (reset_cause == SYSTEM_RESET_CAUSE_WDT) {

                 port_pin_set_output_level(LED_0_PIN, LED_0_INACTIVE);

         }

         else {

                 port_pin_set_output_level(LED_0_PIN, LED_0_ACTIVE);

         }

         while (true) {

                 if (port_pin_get_input_level(BUTTON_0_PIN) == false) {

                         port_pin_set_output_level(LED_0_PIN, LED_0_ACTIVE);

                         wdt_reset_count();

                 }

         }

}