stm32 TIM3_CH1 PB4复用输出PWM 完整配置源码

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);这样就可以了，源码上传到我的账号了，可以下载使用，