关于STM32定时器捕获PWM

ZYC111 · 发表于 2015-3-31 21:28:26

RT：这是我Timer4的代码：
void TIM4_PWMINPUT_INIT(u16 arr,u16 psc)
{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM4_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //Open TIM4 clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //open gpioB clock

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//|GPIO_Pin_8; //GPIO??
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr; //?è???????????ü??????×°????????×?????×°???????÷????????
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(TIM4, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

/*??????????????*/
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM4_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM4_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM4, &TIM4_ICInitStructure); //PWM????????
TIM_ITConfig(TIM4, TIM_IT_CC2|TIM_IT_Update, ENABLE); //???????
TIM_ClearITPendingBit(TIM4, TIM_IT_CC2|TIM_IT_Update); //????????±ê????

/*TIM4_ICInitStructure.TIM_Channel = TIM_Channel_3;
TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM4_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM4, &TIM4_ICInitStructure); //PWM????????
TIM_ITConfig(TIM4, TIM_IT_CC3|TIM_IT_Update, ENABLE); //???????
TIM_ClearITPendingBit(TIM4, TIM_IT_CC3|TIM_IT_Update); //????????±ê????
*/
TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2); //???????§??????
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset); //???????÷??????????
TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable);


TIM_Cmd(TIM4, ENABLE);
}
void TIM4_IRQHandler(void)
{

if (TIM_GetITStatus(TIM4, TIM_IT_CC2) != RESET)//????1·??ú????????
{
duty = TIM_GetCapture1(TIM4); //????????±?
period = TIM_GetCapture2(TIM4); //????????
}

TIM_ClearITPendingBit(TIM4, TIM_IT_CC2|TIM_IT_Update); //????????±ê????
}

实验证明这段代码可以捕获成功PWM，并用串口显示占空比周期。
同理我就将其移植成Timer2捕获另外一路PWM,代码如下：
void TIM2_PWMINPUT_INIT(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM2_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //Open TIM4 clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //open gpioB clock

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //GPIO??
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr; //?è???????????ü??????×°????????×?????×°???????÷????????
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??????

/*??????????????*/
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM2_ICInitStructure.TIM_ICFilter = 0x0;

TIM_PWMIConfig(TIM2, &TIM2_ICInitStructure); //PWM????????
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2); //???????§??????
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset); //???????÷??????????
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
TIM_ITConfig(TIM2, TIM_IT_CC2|TIM_IT_Update, ENABLE); //????????
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_Update); //????????±ê????
TIM_Cmd(TIM2, ENABLE);
}
void TIM2_IRQHandler(void)
{

if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)//????1·??ú????????
{
duty1 = TIM_GetCapture1(TIM2); //????????±?
period1 = TIM_GetCapture2(TIM2); //????????
}

TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_Update); //????????±ê????
}

实验发现根本捕获不到任何信息，有哪位大神帮我解答下么？困扰好多天了。