STM32 TIM8 PWM

来源：互联网发布：爱发php自动发卡程序编辑：程序博客网时间：2024/06/07 03:12

和普通TIM不一样, 使用TIM8 产生PWM,需要使用

TIM_CtrlPWMOutputs(TIM8, ENABLE);

否则不能产生PWM

完整过程如下:

//gpioc-9  is tim8ch4        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8|RCC_APB2Periph_GPIOC, ENABLE);        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;        GPIO_Init(GPIOC, &GPIO_InitStructure);        TIM_DeInit(TIM8);        //2.7K        TIM_BaseInitStructure.TIM_Period =370;        TIM_BaseInitStructure.TIM_Prescaler = 71;        TIM_BaseInitStructure.TIM_ClockDivision = 0;        TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;        TIM_TimeBaseInit(TIM8, &TIM_BaseInitStructure);        /* Output Compare Active Mode configuration: Channel4 */        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;        TIM_OCInitStructure.TIM_Pulse = 185;        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;        TIM_OC4Init(TIM8, &TIM_OCInitStructure);        TIM_OC4PreloadConfig(TIM8, TIM_OCPreload_Enable);        TIM_ARRPreloadConfig(TIM8, ENABLE);                     TIM_CtrlPWMOutputs(TIM8, ENABLE);         TIM_Cmd(TIM8,ENABLE);

0 0