只有通道ch1正常执行，其余2通道一直常亮

sunsungang

只有通道ch1正常执行，其余2通道一直常亮

[mw_shl_code=c,true]void TIM1_PWM_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);// RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //????GPIO???è?±?????? //?è??????????????????????,????TIM1 CH1??PWM?????¨?? GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0| GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3; //TIM_CH1 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //???????ì???? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); TIM_TimeBaseStructure.TIM_Period = arr; //?è???????????ü??????×°????????×?????×°???????÷???????? 80K TIM_TimeBaseStructure.TIM_Prescaler =psc; //?è??????×÷??TIMx?±?????????????¤·????? ??·??? TIM_TimeBaseStructure.TIM_ClockDivision = 0; //?è???±??·???:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM?ò?????????? TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù?????? TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //?????¨?±?÷????:TIM?????í???÷??????2 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±??????????? TIM_OCInitStructure.TIM_Pulse = 0; //?è????×°??????±????????÷???????? TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????????:TIM????±????????? TIM_OC1Init(TIM2, &TIM_OCInitStructure); //?ù??TIM_OCInitStruct?????¨???????????????èTIMx TIM_CtrlPWMOutputs(TIM2,ENABLE); //MOE ?÷???????? TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable); //CH1?¤×°?????? TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); //CH1?¤×°?????? TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable); //CH1?¤×°?????? TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable); //CH1?¤×°?????? TIM_ARRPreloadConfig(TIM2, ENABLE); //????TIMx??ARR?????¤×°???????÷ TIM_Cmd(TIM2, ENABLE); //????TIM1 }[/mw_shl_code]

[mw_shl_code=c,true] int main(void) { u16 led0pwmval=0; u8 dir=1; delay_init(); //???±?????????? LED_Init(); //????????LED?????????????? TIM1_PWM_Init(899,0);//??·?????PWM????=72000/(899+1)=80Khz while(1) { delay_ms(10); if(dir)led0pwmval++; else led0pwmval--; if(led0pwmval>300)dir=0; if(led0pwmval==0)dir=1; TIM2->CCR1=led0pwmval; TIM2->CCR2=led0pwmval; TIM2->CCR3=led0pwmval; TIM2->CCR4=led0pwmval; } }[/mw_shl_code]

lycreturn

TIM_OC1Init(TIM2, &TIM_OCInitStructure); 
你就初始化通道1，还想通道2  3  4也跟着跑

sunsungang

回复【2楼】lycreturn:
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我加上TIM_OC2Init(TIM2, &TIM_OCInitStructure);TIM_OC3Init(TIM2, &TIM_OCInitStructure);TIM_OC4Init(TIM2, &TIM_OCInitStructure);输出
但是电机 ch2和ch3输出断断续续，求解

lycreturn

回复【3楼】sunsungang:
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不接电机，直接用示波器测试下IO输出波形