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      1. 專注電子技術學習與研究
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        ARM107的TIM1輸出PWM波形

        作者:星星and宇   來源:不詳   點擊數:  更新時間:2014年08月03日   【字體:

          void PWM_Out_Init(void)

        {
          /*!< At this stage the microcontroller clock setting is already configured, 
               this is done through SystemInit() function which is called from startup
               file (startup_stm32f10x_xx.s) before to branch to application main.
               To reconfigure the default setting of SystemInit() function, refer to
               system_stm32f10x.c file
             */     
               
          /* System Clocks Configuration */
          RCC_PWM_Configuration();
         
          /* GPIO Configuration */
          GPIOPWM_Configuration();
         
          /* Compute the prescaler value */
          TIM_DeInit(TIM1);//初始化TIM1寄存器
          PrescalerValue = (uint16_t) (SystemCoreClock / 2000) - 1;
          /* Time base configuration */
          TIM_TimeBaseStructure.TIM_Period = 499;
          TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
          TIM_TimeBaseStructure.TIM_ClockDivision = 0;
          TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
         
          TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
         
          /* PWM1 Mode configuration: Channel1 */
          TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//PWM1為正常占空比模式,PWM2為反極性模式
          TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
          TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable;//互補輸出允許
         
          TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//High為占空比高極性
          TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_High;//互補輸出,與以上相反
          TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Set;
          TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
          TIM_OC1Init(TIM1, &TIM_OCInitStructure);
         
          TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
          TIM_ARRPreloadConfig(TIM1, ENABLE);
         
          TIM_Cmd(TIM1, ENABLE);
          TIM_CtrlPWMOutputs(TIM1,ENABLE);//使能TIM1的PWM輸出,TIM1與TIM8有效
         
        }
         
        /**
          * @brief  Configures the different system clocks.
          * @param  None
          * @retval None
          */
        void RCC_PWM_Configuration(void)
        {
          /* TIM3 clock enable */
          RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
         
          /* GPIOA and GPIOB clock enable */
          RCC_APB2PeriphClockCmd(  RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
        }
         
        /**
          * @brief  Configure the TIM3 Ouput Channels.
          * @param  None
          * @retval None
          */
        void GPIOPWM_Configuration(void)
        {
          GPIO_InitTypeDef GPIO_InitStructure;
         
        //#ifdef STM32F10X_CL
          /*GPIOB Configuration: TIM3 channel1, 2, 3 and 4 */
          //GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
         // GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
         // GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
         
         // GPIO_Init(GPIOC, &GPIO_InitStructure);
         
         // GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);
         
        //#else
          /* GPIOA Configuration:TIM3 Channel1, 2, 3 and 4 as alternate function push-pull */
          GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 ;
          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
          GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
          
          GPIO_Init(GPIOE, &GPIO_InitStructure);
          GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE);
        //#endif
        }
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