NiobeU4开发板PWM使用说明文档

DevHandle PwmOpen(uint32_t num);

int32_t PwmSetConfig(DevHandle handle, struct PwmConfig *config);

int32_t PwmSetDuty(DevHandle handle, uint32_t duty);

pwm_config {
    template default_config {
        match_attr = "config_pwm0";
        channel = "LEDC_CHANNEL_0";         // PWM通道, 对应 ledc_channel_t 枚举
        timer = "LEDC_TIMER_0";             // 定时器单元，对应 ledc_timer_t 枚举
        freq_hz = 2000;                      // PWM周期频率(单位Hz)
        gpio_pin = "GPIO_NUM_21";           // 外部PWM输出的GPIO Pin脚，对应 gpio_num_t 枚举
    }
    pwm0 :: default_config {
        match_attr = "config_pwm0";
    }
    pwm1 :: default_config {
        match_attr = "config_pwm1";
        channel = "LEDC_CHANNEL_1";
        timer = "LEDC_TIMER_1";
        pwm_pin = "GPIO_NUM_25";
    }
}