求助贴：关于增量型光电编码器的脉冲捕获问题

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本人最近在做一个光电编码器脉冲捕获的实验，按照一些资料和手册做了相应IO口的配置，下面是我个人移植的一些代码。
“encorder.c”文件代码：

1. #include "encoder.h"
   
2. 
   
3. TIM_ICInitTypeDef TIM5_ICInitStructure;
   
4. void TIM5_Cap_Init(u16 arr,u16 psc)
   
5. {
   
6. GPIO_InitTypeDef GPIO_InitStructure;
   
7. TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   
8. NVIC_InitTypeDef NVIC_InitStructure;
   
9. RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //ê1Äü TIM5 ê±Öó
   
10. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //ê1Äü GPIOB ê±Öó
    
11. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PB0 Çå3t֮ǰéèÖÃ
    
12. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PB0 êäèë
    
13. GPIO_Init(GPIOB, &GPIO_InitStructure);//3õê¼»ˉ GPIOB.0
    
14. GPIO_ResetBits(GPIOB,GPIO_Pin_0);  //PB0 ÏÂà-
    
15. TIM_TimeBaseStructure.TIM_Period = arr; //é趨¼ÆêyÆ÷×Ô¶ˉÖØ×°
    
16. TIM_TimeBaseStructure.TIM_Prescaler =psc; //Ô¤·ÖÆμÆ÷
    
17. TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // TDTS = Tck_tim
    
18. TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM ÏòéϼÆêyÄ￡ê½
    
19. TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMx
    
20. TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; // Ñ¡Ôñêäèë¶Ë IC1 ó3éäμ½ TI1 éÏ
    
21. TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;  //éÏéyÑØ2¶»ñ
    
22. TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //ó3éäμ½ TI1 éÏ
    
23. TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //ÅäÖÃêäèë·ÖÆμ,2»·ÖÆμ
    
24. TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ÅäÖÃêäèëÂË2¨Æ÷ 2»ÂË2¨
    
25. TIM_ICInit(TIM5, &TIM5_ICInitStructure);//3õê¼»ˉ TIM5 êäèë2¶»ñí¨μà 1
    
26. 
    
27. NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM5 ÖD¶Ï
    
28. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //ÏèÕ¼óÅÏ輶¶t¼¶
    
29. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶0¼¶
    
30. NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ í¨μà±»ê1Äü
    
31. NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉ NVIC
    
32. 
    
33. TIM_ITConfig( TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//ÔêDí¸üDÂÖD¶Ï2¶»ñÖD¶Ï
    
34. TIM_Cmd(TIM5,ENABLE );}  //ê1Äü¶¨ê±Æ÷5
    
35. u8 TIM5CH1_CAPTURE_STA=0;  //êäèë2¶»ñ×′ì¬
    
36. u16 TIM5CH1_CAPTURE_VAL; //êäèë2¶»ñÖμ
    
37. //¶¨ê±Æ÷5·tÎñÖD¶Ï3ìDò
    
38. void TIM5_IRQHandler(void)
    
39. {
    
40. if((TIM5CH1_CAPTURE_STA&0X80)==0)//»1Î′3é1|2¶»ñ
    
41. {
    
42. if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
    
43. {
    
44. if(TIM5CH1_CAPTURE_STA&0X40)//òѾ-2¶»ñμ½¸ßμçƽáË
    
45.         {
    
46. if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//¸ßμçƽì«3¤áË
    
47. {
    
48. TIM5CH1_CAPTURE_STA|=0X80;//±ê¼Ç3é1|2¶»ñáËò»′Î
    
49. TIM5CH1_CAPTURE_VAL=0XFFFF;
    
50. }else TIM5CH1_CAPTURE_STA++;
    
51. }
    
52. }
    
53. if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//2¶»ñ1·￠éú2¶»ñê¼t
    
54. {
    
55. if(TIM5CH1_CAPTURE_STA&0X40) //2¶»ñμ½ò»¸öϽμÑØ
    
56. {
    
57. TIM5CH1_CAPTURE_STA|=0X80;  //±êÖ¾3é1|2¶»ñμ½ò»′ÎéÏéyÑØ
    
58. TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
    
59. TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //éèÖÃÎaéÏéyÑØ2¶»ñ
    
60. }else //»1Î′¿aê¼￡¬μúò»′Î2¶»ñéÏéyÑØ
    
61. {
    
62. TIM5CH1_CAPTURE_STA=0;  //Çå¿Õ
    
63. TIM5CH1_CAPTURE_VAL=0;
    
64. TIM_SetCounter(TIM5,0);
    
65. TIM5CH1_CAPTURE_STA|=0X40;  //±ê¼Ç2¶»ñμ½éÏéyÑØ
    
66. TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //éèÖÃÎaϽμÑØ2¶»ñ
    
67. }
    
68. }
    
69. }
    
70. TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //Çå3yÖD¶Ï±ê־λ
    
71. }

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“encoder.h"文件代码：

1. #ifndef _ENCODER_H
   
2. #define _ENCODER_H
   
3. #include "stm32f10x.h"
   
4. #include "misc.h"
   
5. #include "stm32f10x_tim.h"
   
6. #endif
   
7. 
   
8. void TIM5_Cap_Init(u16 arr,u16 psc);
   
9. void TIM5_IRQHandler(void);
   

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