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    //gpio_set_func(BKPWM,IO_FUN_3);    // PE6 pwm1 设置为PWM 模式
    //gpio_set_func(PWM0,IO_FUN_3);      // PA2设置为PWM 模式

    /************************* 设置 pwm1 通道  开始  ************************** /
    rt_uint32_t period, pulse;
    period = 500000;    // 周期为0.5ms，单位为纳秒ns
    pulse =  5000;    // PWM脉冲宽度值，单位为纳秒ns
    // 查找设备
    pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME);
    if (pwm_dev == RT_NULL){
        rt_kprintf("pwm sample run failed! can't find %s device!\n", PWM_DEV_NAME);
        return RT_ERROR;
    }
    // 设置PWM周期和脉冲宽度
    rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse); //PWM_DEV_CHANNEL 1  period 500000 pulse 5000
    // 使能设备
    rt_pwm_enable(pwm_dev, PWM_DEV_CHANNEL);
    rt_kprintf("%s  run success! \n", PWM_DEV_NAME);
    /************************* 设置 pwm1 通道  结束  **************************/

     gpio_set_func(BKPWM,IO_FUN_3);
     gpio_set_pull_mode(BKPWM,PULL_DISABLE);
     pwm_init(PWM1, PWM_MODE_CONTINUOUS, 1, PWM_PSC_120); // 24M / 120 = 200kHz
     pwm_set_period(PWM1, LED_PWM_PERIOD); // 200k / 200 = 1kHz
     pwm_set_pulse_len(PWM1, 30);
     pwm_enable(PWM1);