关于红外遥控的问题

ping1185279685

我看了不少关于 NEC协议 的资料，然后根据自己的理解写了下面的程序，但是不知道怎么又错误了
主要是红色字下面的程序  是我自己的理解，希望得到指点..谢谢了
void TIM4_Config(void){
//PB9
GPIO_InitTypeDef GPIO_InitStruct ; 
NVIC_InitTypeDef NVIC_InitStructure;
 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 TIM_ICInitTypeDef  TIM_ICInitStructure;
RCC_APB2PeriphClockCmd ( RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM4,ENABLE);
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPD ;
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_9;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz ;
GPIO_Init(GPIOB ,&GPIO_InitStruct) ;  
//TIM4
TIM_TimeBaseStructure.TIM_Period = 10000; 
TIM_TimeBaseStructure.TIM_Prescaler =(72-1);
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; 
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_4; 
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //????????·???,??·??? 
  TIM_ICInitStructure.TIM_ICFilter = 0x03;
  TIM_ICInit(TIM4, &TIM_ICInitStructure);
    TIM_Cmd(TIM4,ENABLE ); 
 
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;  
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; 
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
NVIC_Init(&NVIC_InitStructure); 
TIM_ITConfig( TIM4,TIM_IT_Update|TIM_IT_CC4,ENABLE);
}

void TIM4_IRQHandler(void){
if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_9)==1){
TIM_OC4PolarityConfig(TIM4,TIM_ICPolarity_Falling); 
    TIM_SetCounter(TIM4,0);   
TIM_ClearFlag(TIM4,TIM_IT_Update|TIM_IT_CC4);
}else{  //??????
TIM_OC4PolarityConfig(TIM4,TIM_ICPolarity_Rising); 
TIM_ClearFlag(TIM4,TIM_IT_Update|TIM_IT_CC4);
num=TIM_GetCapture4(TIM4);

下面的 if  语句   我是捕捉每次的下降沿，然后判断数据的逻辑值0 还是1
if(num>300&&num<800)
{
Rec<<=1; 
Rec|=0; 
NUMCnt++;
}
if(num>1400&&num<1800) 
{
Rec<<=1; 
Rec|=1; 
NUMCnt++;
}
if(num>2200&&num<2600)
{
Cnt++; 
}
}
if(num>4200&&num<4700) 
{
Cnt=0; 
}
}

//这个函数我是通过 移位  把所需要的那八位数据给移出来，去掉其他的24位
unsigned char DO_Rec(unsigned int data){
unsigned char mydata=0;
unsigned int tem_data=0;
tem_data=data>>8;
tem_data=data<<24;
mydata=data>>24;
return mydata;
}

正点原子

这个慢慢仿真找问题吧。。。一步步来。