[Atmel] 用ASF跑SAMD21程序(29) 呼吸灯

static void tcc_callback_to_change_duty_cycle(

struct tcc_module *const module_inst)

{

        static uint32_t delay = 10;

        static bool flag = true;

        if(flag)

    {

                delay +=64;

                if(delay >= 0xFFE0)

                flag = false;

        }

        else

        {

                delay-=64;

                if(delay<=0x20)

                flag = true;

                

        }

        

        tcc_set_compare_value(module_inst,

        (enum tcc_match_capture_channel)

        (TCC_MATCH_CAPTURE_CHANNEL_0 + CONF_PWM_CHANNEL),

        delay + 1);

}

/**

 * \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).

 */







#include <asf.h>

#define CONF_PWM_MODULE      LED_0_PWM4CTRL_MODULE

#define CONF_PWM_CHANNEL     LED_0_PWM4CTRL_CHANNEL

#define CONF_PWM_OUTPUT      LED_0_PWM4CTRL_OUTPUT

#define CONF_PWM_OUT_PIN     LED_0_PWM4CTRL_PIN

#define CONF_PWM_OUT_MUX     LED_0_PWM4CTRL_MUX



static void configure_tcc_callbacks(void);

static void configure_tcc(void);

static void tcc_callback_to_change_duty_cycle(struct tcc_module *const module_inst);

struct tcc_module tcc_instance;



static void tcc_callback_to_change_duty_cycle(

struct tcc_module *const module_inst)

{

        static uint32_t delay = 10;

        static bool flag = true;

        if(flag)

    {

                delay +=64;

                if(delay >= 0xFFE0)

                flag = false;

        }

        else

        {

                delay-=64;

                if(delay<=0x20)

                flag = true;

                

        }

        

        tcc_set_compare_value(module_inst,

        (enum tcc_match_capture_channel)

        (TCC_MATCH_CAPTURE_CHANNEL_0 + CONF_PWM_CHANNEL),

        delay + 1);

}



static void configure_tcc(void)

{

        struct tcc_config config_tcc;

        tcc_get_config_defaults(&config_tcc, CONF_PWM_MODULE);

        config_tcc.counter.period = 0xFFFF;

        config_tcc.compare.wave_generation = TCC_WAVE_GENERATION_SINGLE_SLOPE_PWM;

        config_tcc.compare.match[CONF_PWM_CHANNEL] = 0xFFFF;

        config_tcc.pins.enable_wave_out_pin[CONF_PWM_OUTPUT] = true;

        config_tcc.pins.wave_out_pin[CONF_PWM_OUTPUT]        = CONF_PWM_OUT_PIN;

        config_tcc.pins.wave_out_pin_mux[CONF_PWM_OUTPUT]    = CONF_PWM_OUT_MUX;

        tcc_init(&tcc_instance, CONF_PWM_MODULE, &config_tcc);

        tcc_enable(&tcc_instance);

}

static void configure_tcc_callbacks(void)

{

        tcc_register_callback(

        &tcc_instance,

        tcc_callback_to_change_duty_cycle,

        (enum tcc_callback)(TCC_CALLBACK_CHANNEL_0 + CONF_PWM_CHANNEL));

        tcc_enable_callback(&tcc_instance,

        (enum tcc_callback)(TCC_CALLBACK_CHANNEL_0 + CONF_PWM_CHANNEL));

}





int main (void)

{

        system_init();

        configure_tcc();

        configure_tcc_callbacks();



        system_interrupt_enable_global();

        while (true) {

        }

}