STM32F405使用一个定时器输出两路PWM波时，将两个引脚的复用写在同一GPIO_PinAFConfig()中会导致一个引脚无法正常输出

zhangzhe · 发表于 2020-8-14 10:21:52

void TimeSteerMotorConfig(u32 arr,u32 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE); //TIM4时钟使能
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); //使能GPIOB时钟
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_TIM4);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; //GPIO
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOB,&GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Prescaler=psc; //定时器分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period=arr; //自动重装载值
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
//TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;//默认就为0
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure); //初始化定时器4
//初始化TIM1 PWM模式
//PWM 模式 1–– 在递增计数模式下，只要 TIMx_CNT<TIMx_CCR1，通道 1 便为有效状态，否则为无效状态。在递减计数模式下，
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM1为正常占空比模式，PWM2为反极性模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低,有效电平为低电平
// TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //在空闲时输出低,这里的设置可以改变TIM_OCPolarity 如果没这句，第1通道有问题
TIM_OCInitStructure.TIM_Pulse = 2000; //输入通道1 CCR1（占空比数值）
TIM_OC1Init(TIM4, &TIM_OCInitStructure); //Ch1初始化
TIM_OC2Init(TIM4, &TIM_OCInitStructure); //TIM4中CH2初始化
//TIM_OCInitStructure.TIM_Pulse = 5000;
//TIM_OC4Init(TIM8, &TIM_OCInitStructure);//通道4
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM1在CCR1上的预装载寄存器,CCR自动装载默认也是打开的
TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM4在CCR2上得预装载寄存器
TIM_ARRPreloadConfig(TIM4,ENABLE); //ARPE使能
TIM_Cmd(TIM4, ENABLE); //使能TIM1
TIM_CtrlPWMOutputs(TIM4, ENABLE); //使能TIM1的PWM输出，TIM1与TIM8有效,如果没有这行会问题
}