STM32的定时器作为编码器的问题

只看该作者 · 2011-10-24 15:55

最近正在用STM32的定时器进行编码器的配置进行脉冲的读取，在网上查很多资料，我配置后通过软件仿真但总是没有反应，计数器的值没有什么变化，求高人指点迷津。
配置程序如下：
#include "stm32f10x_lib.h"
#define ENCODER_TIMER TIM3
#define ENCODER_PPR          (u16)(500)
#define ENCODER_TIM_PERIOD 2000
#define MAX_COUNT 2300
#define SPEED_SAMPLING_TIME 4000
#define COUNTER_RESET (u16)0
#define ICx_FILTER    (u8) 6
#define TIMx_PRE_EMPTION_PRIORITY 1
#define TIMx_SUB_PRIORITY 0
#define SPEED_SAMPLING_FREQ ((u16)(2000/(SPEED_SAMPLING_TIME+1)))
GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;
volatile s32  CurrentCount  ;
void RCC_Configuration(void);
void NVIC_Configuration(void);
void Delay(vu32 nCount);
void GPIO_Configuration(void);
void ENC_Init(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_ICInitTypeDef TIM_ICInitStructure;

/* Encoder unit connected to TIM3, 4X mode */
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  /* TIM3 clock source enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  /* Enable GPIOA, clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  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);

  /* Enable the TIM3 Update Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = TIMx_PRE_EMPTION_PRIORITY;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = TIMx_SUB_PRIORITY;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_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 = ENCODER_TIM_PERIOD;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(ENCODER_TIMER, &TIM_TimeBaseStructure);

//TIM_EncoderMode：触发源 TIM_ IC1Polarity：TI1 极性  TIM_ IC2Polarity：TI2 极性
  TIM_EncoderInterfaceConfig(ENCODER_TIMER, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising); //TIMx：x 可以是 2，3 或者 4，来选择 TIM 外设
  TIM_ICStructInit(&TIM_ICInitStructure);
  TIM_ICInitStructure.TIM_ICFilter = ICx_FILTER;  //设定滤波值
  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;

//  ENC_Clear_Speed_Buffer();

  TIM_Cmd(ENCODER_TIMER, ENABLE);

}

int main(void)
{
  #ifdef DEBUG
  debug();
  #endif
  RCC_Configuration();
  NVIC_Configuration();
  GPIO_Configuration();
  ENC_Init() ;
  while(1)
  {
CurrentCount= TIM_GetCounter(TIM3);
  }

}