STM32 TIM1上电PWM通道都会低电平一段时间，求大神帮忙！谢谢。

scb_sun

STM32 TIM1上电 PWM通道都会低电平一段时间，这样上下桥就同时导通了，桥是N+N，我上桥是自举升压低电平导通，下桥也是低电平导通，不该硬件的情况下，软件上怎么解决，通过改GPIO初始化顺序可以知道是GPIO初始化完成后变成低电平的，求大神帮忙解决！谢谢。

scb_sun

我改了CHx和CHxN的GPIO的初始化顺序，导通顺序就变了，说明是在这部分被置低电平的，管脚输出模式只要是推挽或复用推挽都会出现这个问题，大神们有没有什么好的解决办法 ？

QL1988

我也遇到同样问题
请问你的解决了吗

HXYDJ

[mw_shl_code=c,true]void TIM1_PWM_DeadtimeInit(u16 arr, u16 psc, u16 ccr1, u16 ccr2, u16 deadtime)
{
    GPIO_InitTypeDef GPIO_InitSturcture;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

    //TIM1 互补PWM CH1->PA8  CH2->PA9  CH1N->PB13  CH2N->PB14
    GPIO_InitSturcture.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
    GPIO_InitSturcture.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitSturcture.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitSturcture);

    GPIO_InitSturcture.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
    GPIO_InitSturcture.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitSturcture.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitSturcture);
    //定时器设置
    TIM_TimeBaseInitStructure.TIM_Period = arr;
    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInitStructure.TIM_ClockDivision = 0x00;
    TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
    //通道1 捕获比较模式设置
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;                                 //翻转，当 TIMx_CCR1=TIMx_CNT时，翻转OC1REF的电平
    TIM_OCInitStructure.TIM_Pulse = ccr1;                                                        //100
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;                //CCER的CC1P，输入/捕获输出极性
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;         //CER的CC1N，输入/捕获输出使能
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;        //OIS1位
    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;  //CR2的OIS1N位，当MOE位0时，输出空闲状态位OIS1N.
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    //通道2 设置
    TIM_OCInitStructure.TIM_Pulse = ccr2;                                                        //316
    TIM_OC2Init(TIM1, &TIM_OCInitStructure);
    //刹车和死区设置
    TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;         //OSSR:运行模式下“关闭状态”选择
    TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;         //OSSI:空闲模式下“关闭状态”选择
    TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;                         //锁定设 置，级别为1
    TIM_BDTRInitStructure.TIM_DeadTime = deadtime;                                        //死区延时时间
    TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;                        //禁止刹车输 入
    TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;                 //刹车输入极性
    TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; //自动输出使能
    TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
       
        TIM_CtrlPWMOutputs(TIM1,ENABLE);
        TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);
        TIM_OC2PreloadConfig(TIM1,TIM_OCPreload_Enable);
        TIM_ARRPreloadConfig(TIM1,ENABLE);
        TIM_Cmd(TIM1,ENABLE);
}[/mw_shl_code]用互补通道，然后设置死区时间。

稻花香4

我也遇到了这个问题用mini板原子的pwm官方例程，单步调试到GPIO_Init(GPIOA, &GPIO_InitStructure);就输出低电平灯就亮了。