stm32f0用定时器的通道进行外部输入捕获失败（纯移植STM32F1系列）无解

小小飞行器 · 发表于 2015-2-11 22:22:32

#include "PPM.h"
#include "USART1.h"

int ppm=0;

void TIM14_PPM_Init(void)
{
     TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   TIM_ICInitTypeDef TIM14_ICInitStructure;
     NVIC_InitTypeDef NVIC_InitStructure;
     GPIO_InitTypeDef GPIO_InitStructure;



     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14, ENABLE);

     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;
     GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_0); // ????

    NVIC_InitStructure.NVIC_IRQChannel = TIM14_IRQn;
     NVIC_InitStructure.NVIC_IRQChannelPriority =0x00;
     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
     NVIC_Init(&NVIC_InitStructure);

     TIM_TimeBaseStructure.TIM_Period = 30000;           // ×?????×°???????÷????????(??????)
     TIM_TimeBaseStructure.TIM_Prescaler = 45; //?±???¤·?????
     TIM_TimeBaseStructure.TIM_ClockDivision = 0;
     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//?ò??????????
   TIM_TimeBaseInit(TIM14, &TIM_TimeBaseStructure);


   TIM14_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 ?????????? IC1??????TI1??
TIM14_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //??????????
TIM14_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //??????TI1??
TIM14_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //????????·???,??·???
TIM14_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ???????????¨?÷ ?????¨
TIM_ICInit(TIM14, &TIM14_ICInitStructure);

TIM_ITConfig(TIM14,TIM_IT_CC1,ENABLE);//???í?ü?????? ,???íCC1IE????????
    // TIM_ITConfig(TIM14,TIM_IT_Update,ENABLE);//???????¨?±?÷?ü??????????????·???°ü
    TIM_Cmd(TIM14, ENABLE);

}

char Rising;
char Falling;
char Rising=1;
char Falling=0;
int now;
int last;
int ppm;

void TIM14_IRQHandler(void)
{

    if (TIM_GetITStatus(TIM14, TIM_IT_CC1) != RESET)//????·??ú????????
  {
     TIM_ClearITPendingBit(TIM14, TIM_IT_CC1);
   if(Rising==1)  //????????????????
   {
      last=TIM_GetCapture1(TIM14);
     TIM_OC1PolarityConfig(TIM14,TIM_ICPolarity_Falling ); //CC1P=0 ?è??????????????
    Rising=0;
    Falling=1;
    printf("last%d\r\n",last);

   }
   if(Falling==1)  //??????????????
   {
     now=TIM_GetCapture1(TIM14);
     ppm=now-last;
     TIM_OC1PolarityConfig(TIM14,TIM_ICPolarity_Rising);  //CC1P=1 ?è??????????????
     Rising=1;
     Falling=0;
     printf("now%d\r\n",now);
     printf("ppm   %d\r\n",ppm);

   }


  }
}