stm32F103使用定时器3配置PB4引脚产生1KHz的PWM波

引脚配置

void TIM3_GPIO_Config(void) 

{

  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);

  GPIO_PinRemapConfig(GPIO_Remap_SWJ_NoJTRST, ENABLE); 

GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);

  GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_4);

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  

  GPIO_Init(GPIOB, &GPIO_InitStructure); 

  //GPIO_SetBits(GPIOB, GPIO_Pin_4);

}

功能参数配置

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

TIM_TimeBaseStructure.TIM_Period = 1000;     /*¼ÆÊýÖµ 1S*/  

TIM_TimeBaseStructure.TIM_Prescaler = 72-1;        /*Ô¤·ÖƵ,´ËÖµ+1Ϊ·ÖƵµÄ³ýÊý*/

TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; 

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

TIM_ClearITPendingBit(TIM3,  TIM_IT_Update); 

TIM_ITConfig(TIM3,  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_High;

TIM_OC1Init(TIM3, &TIM_OCInitStructure);  

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  

TIM_CtrlPWMOutputs(TIM3,ENABLE);  

  TIM_ARRPreloadConfig(TIM3, ENABLE); 

TIM_Cmd(TIM3, ENABLE);