关于定时器捕获输入PWM波的问题，请各位大神指点！！谢谢啦~

ly0811 · 发表于 2015-4-17 11:27:58

我想用TIM5的四个通道同时捕获四路PWM输入不知道可不可以？
还有一个问题就是我用TIM5的CH1和TIM2的CH2同时捕获两路PWM，没有输出，但是只用一个定时器就可以，请问这是哪里有问题啊？？
请各位帮帮忙啊！！两个定时器的设置是下面这样的：
#include "timer.h"
#include "led.h"
#include "usart.h"
#include "capture.h"

/*?????????÷·????????·???ú???????????????????????????ú
???????°???ó??PA0(TIM5_CH1)?????????÷CH2?¨??(period1/speed1)??×ó????×ó×???×?PA1(TIM2_CH2)?????????÷CH1?¨??(period2/speed2)
??TIM5 and TIM2????*/

//TIM5?¨??1????????????????PA0
void TIM5_PWMCAP_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM5_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //????TIM5?±??
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //????GPIOA?±??

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0 ?????®?°?è??
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA0????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//??????TIM5
TIM_TimeBaseStructure.TIM_Period = arr; //?è?¨?????÷×?????×°??
TIM_TimeBaseStructure.TIM_Prescaler =psc; //?¤·????÷
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //?è???±??·???:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM?ò??????????
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

//??????TIM5????????????
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 ?????????? IC1??????TI1??
TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //??????????
TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //??????TI1??
TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //????????·???,??·???
TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ???????????¨?÷ ?????¨
//TIM_ICInit(TIM5, &TIM5_ICInitStructure);

//????·?×é??????
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM5????
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //??????????0??
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //????????1??
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??±?????
NVIC_Init(&NVIC_InitStructure); //?ù??NVIC_InitStruct?????¨???????????????èNVIC?????÷

TIM_PWMIConfig(TIM5, &TIM5_ICInitStructure); //PWM????????
TIM_SelectInputTrigger(TIM5, TIM_TS_TI1FP1); //???????§??????
TIM_SelectSlaveMode(TIM5, TIM_SlaveMode_Reset); //???????÷??????????
TIM_SelectMasterSlaveMode(TIM5, TIM_MasterSlaveMode_Enable);
TIM_ITConfig(TIM5, TIM_IT_CC1|TIM_IT_Update, ENABLE); //????????
TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //????????±ê????
TIM_Cmd(TIM5, ENABLE);
}

//TIM2?¨??2????????????????PA1
void TIM2_PWMCAP_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM2_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //????TIM2?±??
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //????GPIOA?±??

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //PA1 ?????®?°?è??
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA1 ????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//??????TIM2
TIM_TimeBaseStructure.TIM_Period = arr; //?è?¨?????÷×?????×°??
TIM_TimeBaseStructure.TIM_Prescaler =psc; //?¤·????÷
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //?è???±??·???:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM?ò??????????
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

//??????TIM2????????????
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC2S=01 ?????????? IC2??????TI2??
TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //??????????
TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //??????TI2??
TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //????????·???,??·???
TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ???????????¨?÷ ?????¨
//TIM_ICInit(TIM2, &TIM2_ICInitStructure);

//????·?×é??????
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2????
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //??????????0??
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //????????1??
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??±?????
NVIC_Init(&NVIC_InitStructure); //?ù??NVIC_InitStruct?????¨???????????????èNVIC?????÷

TIM_PWMIConfig(TIM2, &TIM2_ICInitStructure); //PWM????????
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2); //???????§??????
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset); //???????÷??????????
TIM_SelectMasterSlaveMode(TIM5, TIM_MasterSlaveMode_Enable);
TIM_ITConfig(TIM5, TIM_IT_CC2|TIM_IT_Update, ENABLE); //????????
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_Update); //????????±ê????
TIM_Cmd(TIM2, ENABLE);
}

u16 period2 = 0;
u16 speed2 = 0;
u8 CollectFlag2 = 1; //????×???
u16 period1 = 0;
u16 speed1 = 0;
u8 CollectFlag1 = 1; //????×???
void TIM5_IRQHandler(void)
{

if(CollectFlag1){
if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//????1·??ú????????
{
speed1 = TIM_GetCapture1(TIM5); //????????±?
period1 = TIM_GetCapture2(TIM5); //????????
}

CollectFlag1 = 0;
}
TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //????????±ê????
}
void TIM2_IRQHandler(void)
{

if(CollectFlag2){
if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)//????1·??ú????????
{
speed2 = TIM_GetCapture1(TIM2); //????????±?
period2 = TIM_GetCapture2(TIM2); //????????
}

CollectFlag2 = 0;
}
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_Update); //????????±ê????
}

主函数里相关设置如下：
while(1)
{
delay_ms(100);
if(!CollectFlag1){
printf("duty1 = %dus \r\n",speed1); //?ò??????±?
printf("period1 = %dus\r\n",period1); //?ò??????
CollectFlag1 =1;
}
delay_ms(100);
if(!CollectFlag2){
printf("duty2 = %d%% \r\n",speed2*100/period2); //?ò??????±?
printf("period2 = %dus\r\n",period2); //?ò??????
CollectFlag2 =1;
}
}
}