STM32F103精英板，用定时器3通过PA6,PA7输出两路PWM，结果为0

CVVBB3 · 发表于 2021-6-7 21:30:48

void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    //使能定时器时钟2
   RCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIOA

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; //使能TIM2的CH3和CH4
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr; //
TIM_TimeBaseStructure.TIM_Prescaler =psc; //
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //一般设置为0
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse = 0; //CCR初始值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //有效电平为高电平
TIM_OC1Init(TIM3, &TIM_OCInitStructure);                   //根据参数初始化TIM3的通道4
TIM_OC2Init(TIM3, &TIM_OCInitStructure);                      //根据参数初始化TIM3的通道3
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //CH3预转载使能
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);//CH4预转载使能

TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIM2的ARR预装载寄存器

TIM_Cmd(TIM3, ENABLE);  //使能TIM3
}