设置PA7 作为 PWM输出
- void TIM_IO_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);
- }
- 设置Timer1 为PWM模式,使能,使能PWM输出
- void TIM_PWM_Config(void)
- {
- /¼ÆËãÔ¤¶¨±íµÄÖµ£¬Ò²¾ÍÊǶàÉÙ¸öʱÖÓ¼ÆÊýΪһ¸öÖÜÆÚ/
- TimerPeriod = (SystemCoreClock / 17570 ) - 1;
- /¼ÆËãCCR1 Ìø×ªÖµ ÔÚÕ¼¿Õ±ÈΪ50%ʱ/
- Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
- /* TIM1 ʱÖÓʹÄÜ /
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
- / Time ¶¨Ê±»ù´¡ÉèÖÃ*/
- TIM_TimeBaseStructure.TIM_Prescaler = 0;
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /* Time ¶¨Ê±ÉèÖÃΪÉÏÉýÑØ¼ÆËãģʽ*/
- TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
- TIM_TimeBaseStructure.TIM_ClockDivision = 0;
- TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
- /* ƵµÀ1£¬2£¬3£¬4µÄPWM ģʽÉèÖà */
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
- TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
- TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
- TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
- TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//ʹÄÜÆµµÀ1ÅäÖÃ
- TIM_OC1Init(TIM1, &TIM_OCInitStructure);
- /* TIM1 ¼ÆËãÆ÷ʹÄÜ*/
- TIM_Cmd(TIM1, ENABLE);
- /* TIM1 Ö÷Êä³öʹÄÜ */
- TIM_CtrlPWMOutputs(TIM1, ENABLE);
- }
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