STM32定时器 TIM3之PWM输出

Posted 2022-08-23 beiyhs

void GPIO_TimPWM(void)

　GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable , ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 ;
GPIO_Init(GPIOA, &GPIO_InitStructure);

void Timer3_Configuration(void)

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
　TIM_OCInitTypeDef TIM_OCInitStructure;
　RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
　TIM_TimeBaseStructure.TIM_Period = 1000-1;
　TIM_TimeBaseStructure.TIM_Prescaler =48-1;
　TIM_TimeBaseStructure.TIM_ClockDivision = 0x00;
　TIM_TimeBaseStructure.TIM_CounterMode = 　TIM_CounterMode_Up;
　TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIM3, DISABLE);
　TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
　TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
　TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
　TIM_OCInitStructure.TIM_OutputState = 　　TIM_OutputState_Enable;
　TIM_OCInitStructure.TIM_Pulse = 500-1;
　TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
　TIM_OC2Init(TIM3, &TIM_OCInitStructure);
　TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
　TIM_CtrlPWMOutputs(TIM3,ENABLE);
　TIM_Cmd(TIM3, ENABLE);