#include "encoding_disk.h"
#include "delay.h"
#include "usart.h"
/**************************************************************************************
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TIM3 óÃà′¼ì2aÂëÅì
PA.6-> RUN-A2         TIM3-CH1//        
PA.7-> RUN-B2         TIM3-CH2//
PB.0-> RUN-A1         TIM3-CH3//
PB.1-> RUN-B1         TIM3-CH4//
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****************************************************************************************/
#define ENCODER_TIMER   TIM3  // Encoder unit connected to TIM3
#define ENCODER_PPR           (u16)(100)   // number of pulses per revolution
#define SPEED_BUFFER_SIZE 8

#define COUNTER_RESET   (u16)0
#define ICx_FILTER      (u8) 6 // 6<-> 670nsec

#define TIMx_PRE_EMPTION_PRIORITY 1
#define TIMx_SUB_PRIORITY 0

#define ENCODER_TIM_PERIOD 0xffff//65536-1
#define MAX_COUNT          10000//10000 1ms 10000

static volatile u16 hEncoder_Timer_Overflow;
void  EncodingDisk_Init(void)
{           

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_ICInitTypeDef TIM_ICInitStructure;
  /* Encoder unit connected to TIM1, 4X mode */   
  GPIO_InitTypeDef GPIO_InitStructure;


  RCC_APB2PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//
  /* Enable GPIOA, clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//GPIOA
  GPIO_StructInit(&GPIO_InitStructure);
  /* Configure PA.06,07 as encoder input */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);


  /* Timer configuration in Encoder mode */
  TIM_DeInit(ENCODER_TIMER);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;  // No prescaling //
  TIM_TimeBaseStructure.TIM_Period = (4*ENCODER_PPR)-1;  //
//  TIM_TimeBaseStructure.TIM_Period = ENCODER_TIM_PERIOD-1;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   //
  TIM_TimeBaseInit(ENCODER_TIMER, &TIM_TimeBaseStructure);
  TIM_EncoderInterfaceConfig(ENCODER_TIMER, TIM_EncoderMode_TI12,TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);//TIM_ICPolarity_BothEdge
  TIM_ICStructInit(&TIM_ICInitStructure);
  TIM_ICInitStructure.TIM_ICFilter =ICx_FILTER;//

  TIM_ICInit(ENCODER_TIMER, &TIM_ICInitStructure);
  // Clear all pending interrupts
  TIM_ClearFlag(ENCODER_TIMER, TIM_FLAG_Update);//
  TIM_ITConfig(ENCODER_TIMER, TIM_IT_Update, ENABLE);

  //Reset counter
  TIM3->CNT = COUNTER_RESET;

  TIM_Cmd(ENCODER_TIMER, ENABLE);
// System.Device.Encoder.Enc_GetCount = Enc_GetCount;

}
s16 Enc_GetCount(void)
{
    static  u16   lastCount = 0;
    u16  curCount = ENCODER_TIMER->CNT;//?????
    s32 dAngle = curCount - lastCount;
    if(dAngle >= MAX_COUNT)
    {
      dAngle -= ENCODER_TIM_PERIOD;
    }
    else if(dAngle < -MAX_COUNT)
    {
      dAngle += ENCODER_TIM_PERIOD;
    }
    lastCount = curCount;
    return (s16)dAngle;
}

主函数
int main(void)
{       
        s16 temp,NUM;
        delay_init();                      
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
        EncodingDisk_Init();

        Usart_Init(9600);            //′&#174;&#191;ú3&#245;ê&#188;&#187;ˉ&#206;a9600

        GPIO_SetBits (GPIOA,GPIO_Pin_11);
  while(1)
  {                 
   NUM = TIM_GetCounter(TIM3);
   if(NUM!=temp)
   {
       temp=NUM;
       printf("%d ",NUM);
   }        
  }

现在出不来码盘的值，找不到具体是哪里出的问题。