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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 Ìøתֵ 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±ÉèÖÃΪÉÏÉýÑؼÆËãģʽ*/ 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;//ʹÄÜƵµÀ1ÅäÖà TIM_OC1Init(TIM1, &TIM_OCInitStructure); /* TIM1 ¼ÆËãÆ÷ʹÄÜ*/ TIM_Cmd(TIM1, ENABLE); /* TIM1 Ö÷Êä³öʹÄÜ */ TIM_CtrlPWMOutputs(TIM1, ENABLE); } |
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