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Code: Untitled.c Select all

void pwm_init(void)

{

    // mcpwm timer

    //定义变量 timer

    mcpwm_timer_handle_t timer;

    //定义操作指针 后面的 gen 和 cmp 都是绑定到操作指针上面

    mcpwm_oper_handle_t opt;

    //定义比较器指针

    mcpwm_cmpr_handle_t cmpa;

    mcpwm_cmpr_handle_t cmpb;

    //定义generator 指针

    mcpwm_gen_handle_t  gena;

    mcpwm_gen_handle_t  genb;



    //配置定时器计算基数和周期

    mcpwm_timer_config_t timer_config = {

        .group_id = 0,

        .clk_src = MCPWM_TIMER_CLK_SRC_DEFAULT,

        .resolution_hz = 1000000,

        .period_ticks = 100,

        .count_mode = MCPWM_TIMER_COUNT_MODE_UP,

    };

    //配置操作指针绑定的分组,编写和timer的分组一致

    mcpwm_operator_config_t operator_config = {

        .group_id = 0,

    };

    //定义比较器配置,在0点更新

    mcpwm_comparator_config_t comparator_config = {

        .flags.update_cmp_on_tez = true,

    };



    //配置生成器绑定的引脚

    mcpwm_generator_config_t generator_config = {};



    //根据配置 初始化定时器

    mcpwm_new_timer(&timer_config, &timer);

    //根据配置 初始化 操作指针

    mcpwm_new_operator(&operator_config, &opt);

    //绑定操作指针和定时器

    mcpwm_operator_connect_timer(opt,timer);



    //when the cmp value to update,绑定比较指针到操作器,并且指明 0时 更新

    mcpwm_new_comparator(opt, &comparator_config, &cmpa);       //set the first cmp

    mcpwm_new_comparator(opt, &comparator_config, &cmpb);       //set the second cmp



    //set the pwm pin 设定pwm的io

    generator_config.gen_gpio_num=1;

    mcpwm_new_generator(opt, &generator_config, &gena);

    generator_config.gen_gpio_num=2;

    mcpwm_new_generator(opt, &generator_config, &genb);



    //set the event when empty or compare , 设定pwm定时器归零时候电平,比较后电平

    mcpwm_generator_set_actions_on_timer_event(gena,

            MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH),

            MCPWM_GEN_TIMER_EVENT_ACTION_END());

    mcpwm_generator_set_actions_on_compare_event(gena,

            MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW),

            MCPWM_GEN_COMPARE_EVENT_ACTION_END());

    mcpwm_generator_set_actions_on_timer_event(genb,

            MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_LOW),

            MCPWM_GEN_TIMER_EVENT_ACTION_END());

    mcpwm_generator_set_actions_on_compare_event(genb,

            MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_HIGH),

            MCPWM_GEN_COMPARE_EVENT_ACTION_END());

    //使能定时器

    mcpwm_timer_enable(timer);

    //启动定时器

    mcpwm_timer_start_stop(timer, MCPWM_TIMER_START_NO_STOP);



    //设定pwm 数值

    mcpwm_comparator_set_compare_value(cmpa,50);

    mcpwm_comparator_set_compare_value(cmpb,20);

}