TM32学习笔记——单定时器四通道输入捕获.docx

原创 STM32学习笔记单定时器四通道输入捕获 复制链接 Apache Apache 当前离线 最后登录2012-11-3在线时间0 小时金币2351 威望53 注册时间2020-6-7阅读权限255帖子1862主题68精华1积分1000UID104832狗仔卡 68主题46好友 1000积分管理员哈工大电子设计联盟威望53 积分1000精华1主题68帖子1862 发消息 电梯直达 楼主 发表于 2012-8-18 23:20:37 |只看该作者 |倒序浏览 以下笔记始发于观海听涛，原创人Apache，转载请说明输入捕获作为定时器的一个功能，在工业测速上有很大的应用。STM32的一些定时器具有四个外部通道，可利用一个定时器采集外部四路脉冲频率，节约硬件资源和软件代码如需要测量一个或多个外部方波脉冲频率，频率低于单片机运行频率，可如下操作：（以TIM4为例）初始化：(省略GPIO配置，将TIM4的四个通道引脚配置为上拉或浮空输入，省略定时器RCC配置，省略中断NVIC配置)1.2. void TIM_Configuration(void)3. 4.5. TIM_ICInitTypeDef 6. TIM_ICInitStructure;7. TIM_TimeBaseInitTypeDef 8. TIM_TimeBaseStructure; / TIM4 时基 9.10. TIM_DeInit(TIM4); 11. TIM_TimeBaseStructure.TIM_Period = 12. 0xffff; 13. /自动重装值 14. TIM_TimeBaseStructure.TIM_Prescaler = 15. 719; 16. /预分频值, 使TIMx_CLK=1MHz 17.18. TIM_TimeBaseStructure.TIM_ClockDivision = 19. TIM_CKD_DIV1; 20. /输入时钟不分频 21. TIM_TimeBaseStructure.TIM_CounterMode = 22. TIM_CounterMode_Up; 23. /向上计数 24. TIM_TimeBaseInit(TIM4, 25. &TIM_TimeBaseStructure);26.27. /TIM4_TimeBase 28. / TIM_ICInitStructure.TIM_ICMode = 29. TIM_ICMode_ICAP; 30. /输入捕捉方式31. TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;/| 32. TIM_Channel_2; /输入通道33.34. TIM_ICInitStructure.TIM_ICPolarity = 35. TIM_ICPolarity_Rising; /捕捉上升沿36.37. TIM_ICInitStructure.TIM_ICSelection = 38. TIM_ICSelection_DirectTI; /捕捉中断39.40. TIM_ICInitStructure.TIM_ICPrescaler = 41. TIM_ICPSC_DIV1; /捕捉不分频42.43. TIM_ICInitStructure.TIM_ICFilter = 44. 0x0; /捕捉输入不滤波45. TIM_ICInit(TIM4, &TIM_ICInitStructure);46. TIM_ICInitStructure.TIM_Channel = TIM_Channel_2 ;/| 47. TIM_Channel_2; /输入通道48.49. TIM_ICInitStructure.TIM_ICPolarity = 50. TIM_ICPolarity_Rising; /捕捉上升沿51.52. TIM_ICInitStructure.TIM_ICSelection = 53. TIM_ICSelection_DirectTI; /捕捉中断54.55. TIM_ICInitStructure.TIM_ICPrescaler = 56. TIM_ICPSC_DIV1; /捕捉不分频57.58. TIM_ICInitStructure.TIM_ICFilter = 59. 0x0; /捕捉输入不滤波60. TIM_ICInit(TIM4, &TIM_ICInitStructure);61. TIM_ICInitStructure.TIM_Channel = TIM_Channel_3 ;/| 62. TIM_Channel_2; /输入通道63.64. TIM_ICInitStructure.TIM_ICPolarity = 65. TIM_ICPolarity_Rising; /捕捉上升沿66.67. TIM_ICInitStructure.TIM_ICSelection = 68. TIM_ICSelection_DirectTI; /捕捉中断69.70. TIM_ICInitStructure.TIM_ICPrescaler = 71. TIM_ICPSC_DIV1; /捕捉不分频72.73. TIM_ICInitStructure.TIM_ICFilter = 74. 0x0; /捕捉输入不滤波75. TIM_ICInit(TIM4, &TIM_ICInitStructure);76. TIM_ICInitStructure.TIM_Channel = TIM_Channel_4 ;/| 77. TIM_Channel_2; /输入通道78.79. TIM_ICInitStructure.TIM_ICPolarity = 80. TIM_ICPolarity_Rising; /捕捉上升沿81.82. TIM_ICInitStructure.TIM_ICSelection = 83. TIM_ICSelection_DirectTI; /捕捉中断84.85. TIM_ICInitStructure.TIM_ICPrescaler = 86. TIM_ICPSC_DIV1; /捕捉不分频87.88. TIM_ICInitStructure.TIM_ICFilter = 89. 0x0; /捕捉输入不滤波90. TIM_ICInit(TIM4, &TIM_ICInitStructure);91. /* TIM enable counter */92. TIM_Cmd(TIM4, ENABLE);93. /* Enable the CC2 Interrupt Request */94. TIM_ITConfig(TIM4, 95. TIM_IT_CC1, ENABLE);96. TIM_ITConfig(TIM4, TIM_IT_CC2, ENABLE);97.98. TIM_ITConfig(TIM4, TIM_IT_CC3, ENABLE);99. TIM_ITConfig(TIM4, TIM_IT_CC4, 100. ENABLE);101. 复制代码其中：TIM_TimeBaseStructure.TIM_Period = 0xffff;为自动重装值，与普通单片机一样TIM_TimeBaseStructure.TIM_Prescaler = 719; 预分频值, 使TIMx_CLK=100KHz ，系统时钟运行于72M时720分频，定时器运行于100KHZ，即10us每分度TIM_ICInitStructure.TIM_ICMode = TIM_ICMode_ICAP; 此句选择定时器为输入捕获模式，但在我的库函数下未定义，所以注释掉，未影响程序执行TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;配置通道1TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;上升沿捕获TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;捕获中断TIM_ICInitStructure.TIM_ICFilter = 0x0;不滤波TIM_ICInit(TIM4, &TIM_ICInitStructure);将配置应用以上每个通道都需要将整个配置再写一遍，使用与|是无效的。TIM_Cmd(TIM4, ENABLE);使能定时器4TIM_ITConfig(TIM4, TIM_IT_CC1, ENABLE);TIM_ITConfig(TIM4, TIM_IT_CC2, ENABLE);TIM_ITConfig(TIM4, TIM_IT_CC3, ENABLE);TIM_ITConfig(TIM4, TIM_IT_CC4, ENABLE);打开四个通道的捕获中断以上将TIM配置完成，下面是中断内代码：1.2. void 3. TIM4_IRQHandler(void)4. 5.6. /频率缓冲区计数 7. static u16 this_time_CH1 = 0; 8. static u16 9. last_time_CH1 = 0; 10. static u8 capture_number_CH1 = 0;11. vu16 12. tmp16_CH1;13. static u16 this_time_CH2 = 0; 14. static u16 last_time_CH2 = 0; 15.16. static u8 capture_number_CH2 = 0;17. vu16 tmp16_CH2;18. static u16 this_time_CH3 = 0; 19. static u16 last_time_CH3 = 0; 20.21. static u8 capture_number_CH3 = 0;22. vu16 tmp16_CH3;23. static u16 this_time_CH4 = 0; 24. static u16 last_time_CH4 = 0; 25.26. static u8 capture_number_CH4 = 0;27. vu16 tmp16_CH4;28.29. if(TIM_GetITStatus(TIM4, TIM_IT_CC1) = SET) 30.31. 32.33. TIM_ClearITPendingBit(TIM4, TIM_IT_CC1); 34. if(capture_number_CH1 = 0) 35.36. 37.38.39. capture_number_CH1 = 1; 40.41.42. last_time_CH1 = TIM_GetCapture1(TIM4); 43.44. 45.46. else if(capture_number_CH1 = 1) 47.48. 49.50.51. capture_number_CH1 = 0; 52.53.54. this_time_CH1 = TIM_GetCapture1(TIM4); 55.56. if(this_time_CH1 last_time_CH1) 57.58. 59.60.61. tmp16_CH1 = (this_time_CH1 - last_time_CH1); 62.63. 64.65. else 66.67. 68.69.70. tmp16_CH1 = (0xFFFF - last_time_CH1) + this_time_CH1); 71.72. 73. /TIM2 74. counter clock = 1MHz 75.76. / 77. FreqBufcnt = (1000000L * 100) / 78. tmp16; 79. /*100为扩大显示量程 80. Freq_Value0=tmp16_CH1; 81.82. 83. 84. if(TIM_GetITStatus(TIM4, TIM_IT_CC2) = SET) 85.86. 87.88. TIM_ClearITPendingBit(TIM4, TIM_IT_CC2); 89. if(capture_number_CH2 = 0) 90.91. 92.93.94. capture_number_CH2 = 1; 95.96.97. last_time_CH2 = TIM_GetCapture2(TIM4); 98.99. 100.101. else if(capture_number_CH2 = 1) 102.103. 104.105.106. capture_number_CH2 = 0; 107.108.109. this_time_CH2 = TIM_GetCapture2(TIM4); 110.111. if(this_time_CH2 last_time_CH2) 112.113. 114.115.116. tmp16_CH2 = (this_time_CH2 - last_time_CH2); 117.118. 119.120. else 121.122. 123.124.125. tmp16_CH2 = (0xFFFF - last_time_CH2) + this_time_CH2); 126.127. 128. /TIM2 129. counter clock = 1MHz 130.131. / 132. FreqBufcnt = (1000000L * 100) / 133. tmp16; 134. /*100为扩大显示量程 135. Freq_Value1=tmp16_CH2; 136.137.138. 139. 140.141. if(TIM_GetITStatus(TIM4, TIM_IT_CC3) = SET) 142.143. 144.145. TIM_ClearITPendingBit(TIM4, TIM_IT_CC3); 146. if(capture_number_CH3 = 0) 147.148. 149.150.151. capture_number_CH3 = 1; 152.153.154. last_time_CH3 = TIM_GetCapture3(TIM4); 155.156. 157.158. else if(capture_number_CH3 = 1) 159.160. 161.162.163. capture_number_CH3 = 0; 164.165.166. this_time_CH3 = TIM_GetCapture3(TIM4); 167.168. if(this_time_CH3 last_time_CH3) 169.170. 171.172.173. tmp16_CH3 = (this_time_CH3 - last_time_CH3); 174.175. 176.177. else 178.179. 180.181.182. tmp16_CH3 = (0xFFFF - last_time_CH3) + this_time_CH3); 183.184. 185. /TIM2 186. counter clock = 1MHz 187.188. / 189. FreqBufcnt = (1000000L * 100) / 190. tmp16; 191. /*100为扩大显示量程 192. Freq_Value2=tmp16_CH3; 193.194. 195. 196.197.198. if(TIM_GetITStatus(TIM4, TIM_IT_CC4) = SET) 199.200. 201.202. TIM_ClearITPendingBit(TIM4, TIM_IT_CC4); 203. if(capture_number_CH4 = 0) 204.205. 206.207.208. capture_number_CH4 = 1; 209.210.211. last_time_CH4 = TIM_GetCapture4(TIM4); 212.213. 214.215. else if(capture_number_CH4 = 1) 216.217. 218.219.220. capture_number_CH4 = 0; 221.222.223. this_time_CH4 = TIM_GetCapture4(TIM4); 224.225. if(this_time_CH4 last_time_CH4) 226.227. 228.229.230. tmp16_CH4 = (this_time_CH4 - last_time_CH4); 231.232. 233.234. else 235.236. 237.238.239. tmp16_CH4 = (0xFFFF - last_time_CH4) + this_time_CH4); 240.241. 242. /TIM2