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//启动定时器
HAL_StatusTypeDef HAL_TIM_Base_Start(TIM_HandleTypeDef *htim);
 
//关闭定时器
HAL_StatusTypeDef HAL_TIM_Base_Stop(TIM_HandleTypeDef *htim);
 
//启动指定通道PWM
HAL_StatusTypeDef HAL_TIM_PWM_Start(TIM_HandleTypeDef *htim, uint32_t Channel);
 
//停止指定通道PWM
HAL_StatusTypeDef HAL_TIM_PWM_Stop(TIM_HandleTypeDef *htim, uint32_t Channel);
 
//设置指定通道占空比
void __HAL_TIM_SetCompare(TIM_HandleTypeDef *htim, uint32_t Channel,uint16_t Value);
 
//设置定时器计数器值
coid __HAL_TIM_SetCompare(TIM_HandleTypeDef *htim, uint16_t Value)

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 if (sta==0){
        HAL_TIM_PWM_Stop(&htim2, TIM_CHANNEL_2);
    } else if(sta==1){
            // D=5%
        HAL_TIM_PWM_Stop(&htim2, TIM_CHANNEL_2);
       D=5;  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);

    } else if (sta==2){
            // 10%≤D≤85%
             HAL_TIM_PWM_Stop(&htim2, TIM_CHANNEL_2);
           D=50; HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);

    } else if (sta==3){
        // 85%<D≤90%
         HAL_TIM_PWM_Stop(&htim2, TIM_CHANNEL_2);
           D=88;HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2); /// 这里的Start 已经不起作用了

    }

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/ 按键中断
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
    if(GPIO_Pin==SW1_Pin)
    {
        HAL_GPIO_WritePin(GPIOB, LED_G_Pin|LED_B_Pin|LED_R_Pin, GPIO_PIN_SET);
        HAL_GPIO_TogglePin(LED_G_GPIO_Port,LED_G_Pin);
        HAL_UART_Transmit(&huart1,"G", sizeof("G")-1, 100);
        sta--;
        if(sta==4){
            HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);

        }



    } else if (GPIO_Pin==SW3_Pin){
        HAL_GPIO_WritePin(GPIOB, LED_G_Pin|LED_B_Pin|LED_R_Pin, GPIO_PIN_SET);
        HAL_GPIO_TogglePin(LED_R_GPIO_Port,LED_R_Pin);
        HAL_UART_Transmit(&huart1,"R", sizeof("R")-1, 100);
        sta++;
        if(sta==4){
            HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);

        }



    }
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{

    if(sta==1){

        set_pwm_param(htim2, TIM_CHANNEL_2, 1000, 50);

    }
    else if(sta==2)
    {
        set_pwm_param(htim2, TIM_CHANNEL_2, 1000, 20);
    }
    else if(sta==3){
        //
        HAL_TIM_PWM_Stop(&htim2, TIM_CHANNEL_2);
        HAL_UART_Transmit(&huart1,"3", sizeof("3")-1, 100);
    }
    else if(sta==4){
        //
        set_pwm_param(htim2, TIM_CHANNEL_2, 1000, 40);

    }

}