STM32F103ZET6，TIM1_CH1产生PWM，仿真时有，但下载到板子上用示波器测总是低电平。MCO已使能

terminator2013

//TIM1_CH1????????GPIOE.9??????????

void syringe_pwm_GPIO_Config(void)

{ 

    GPIO_InitTypeDef GPIO_InitStructure; 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA, ENABLE); //?????¨?±?÷1??GPIOE???è??AFIO???????????é?±??

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //?????¨?±?÷2?±??

GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE); //Timer1??????  TIM1_CH1->E9 

    //?è??????????????????????,????TIM1 CH1??PWM?????¨?? GPIOE.9

    

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9; //TIM1_CH1->E9

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //???????ì????

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 

    GPIO_Init(GPIOE, &GPIO_InitStructure); //??????GPIO

TIM_CtrlPWMOutputs(TIM1, ENABLE);//pwm?????????????¨???????ò????·??ò??·¨??????????????????????????????????????????????????????????

} 

//TIM1?÷????????PWM??TIM2??????????????

void TIM1_Master__TIM2_Slave_Configuration(u32 PulseFrequency) 

{ 

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 

TIM_OCInitTypeDef TIM_OCInitStructure; 

u16 nPDTemp ; 

TIM_Cmd(TIM1, DISABLE); 

//TIMxCLK = 72 MHz, Prescaler = 0x0, TIMx counter clock = 72 MHz

    //TIMx ARR Register = 0 => TIMx Frequency = TIMx counter clock/(ARR + 1)

    //TIMx Frequency = 72MHz.

nPDTemp =  72000000UL/PulseFrequency; //?ü???????±×??????í 72000000UL?°TIM_Prescler

 //??TIM_Period????????0xFFFF

// ?±?ù????,????PWM?????¨?±?÷-TIM1

/* Time base configuration */ 

TIM_TimeBaseStructure.TIM_Period = nPDTemp-1; //?è???????????ü??????×°????????×?????×°???????÷????????

TIM_TimeBaseStructure.TIM_Prescaler = 0; //?è??????×÷??TIMx?±?????????????¤·?????

TIM_TimeBaseStructure.TIM_ClockDivision = 0; //?è???±??·???:TDTS = Tck_tim

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM?ò??????????

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIM1???±???ù??????

//??????TIM1 Channel1 PWM????

/* PWM1 Mode configuration: Channel1 */    

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;// ?????¨?±?÷????:TIM?????í???÷??????1

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????????:TIM????±?????????

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±???????????

TIM_OCInitStructure.TIM_Pulse = nPDTemp>>1;//50% //CCR1_Val/(TIM_Period+1)/2=nPDTemp/(nPDTemp-1+1)/2=0.5

TIM_OC1Init(TIM1, &TIM_OCInitStructure); //?ù?????¨???????????????èTIM1 OC1

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //????TIM1??CCR1?????¤×°???????÷

TIM_ARRPreloadConfig(TIM1, ENABLE); //????TIM1

// ?±?ù????,?????????????÷-TIM2

TIM_TimeBaseStructure.TIM_Period = 0xFFFF;     

TIM_TimeBaseStructure.TIM_Prescaler = 0; 

TIM_TimeBaseStructure.TIM_ClockDivision = 0; 

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); 

// Output Compare Active Mode configuration: Channel1

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive; 

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 

TIM_OCInitStructure.TIM_Pulse = 0xFFFF;//?????????????????ó

TIM_OC1Init(TIM2, &TIM_OCInitStructure); 

// ????TIM1???÷?¨?±?÷

// Select the Master Slave Mode 

TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable); 

// Master Mode selection  

TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update); 

//  ????TIM2?????¨?±?÷ 

// Slave Mode selection: TIM2

TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated); 

TIM_SelectInputTrigger(TIM2, TIM_TS_ITR0); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

TIM_ITRxExternalClockConfig(TIM2, TIM_TS_ITR0);////////????????ITR0?????ò??????×???/////////////??????????????????????????????????????

TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);  

TIM_Cmd(TIM1, DISABLE); 

TIM_Cmd(TIM2, DISABLE); 

} 

void syringe_Output_Pulse(u16 Num)

{

TIM2->CCR1 = Num; 

TIM2->CNT = 0; 

TIM_Cmd(TIM2, ENABLE); 

TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE); 

TIM_Cmd(TIM1, ENABLE); 

TIM1_Pulse_TIM2_Counter_OK = 1;

}

用TIM3输出PWM没有问题，改成TIM1时仿真有，下载到板子上就没了，现在PE9悬空，不是硬件上被置0。
哪位碰到过同样的问题，请帮下忙。谢了。

terminator2013

把重映射去掉，用PA8，仿真有，但实际测的时候还是没有。
下载没问题，开关其他的IO口都有反应。

八度空间

回复【2楼】terminator2013:
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是不是外围的器件干扰引起的，强制性拉低这个管脚

terminator2013

应该不是，现在这个脚悬空着。
我改成TIM1——CH2，测PA9，输出正常。
用TIM1——CH1，不管是否映射，仿真都正常，但下载后PA8，PE9都是低电平。

luckywwq

回复【3楼】Badu_Space:
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为啥仿真上的波周期是1us，但示波器上显示的周期却变成了180ms呢？

luckywwq

会不会是板子上的晶振有问题呢？

luckywwq

这个程序里有个波的周期是2.5ms,仿真和示波器的输出都是正确的，其它周期为1us的波输出全是180ms.这是为什么啊

白桦林

楼主我也遇见这个问题了。求解答