TIM3捕获输入，串口输出

allenzhou

用TIM3捕获输入的PWM波，然后用串口输出数据，现在输出数据总是0

1. 主函数：
   
2. #include "stm32f10x.h"
   
3. #include "bsp_TiMbase.h"
   
4. #include "bsp_usart1.h"
   
5. uint16_t IC2Value;
   
6. uint16_t DutyCycle;
   
7. uint32_t Frequency;
   
8. /**
   
9.   * @brief  Ö÷oˉêy
   
10.   * @param  ÎT  
    
11.   * @retval ÎT
    
12.   */
    
13. int main(void)
    
14. {       
    
15.         TIM3_GPIO_Config();
    
16.        
    
17.         USART1_Config();
    
18.        
    
19.         NVIC_Configuration();
    
20.         /* TIM3 ¶¨ê±ÅäÖà */       
    
21.   TIM3_Configuration();
    
22.         NVIC_Configuration();
    
23.         /* êμÕ½¶¨ê±Æ÷μÄÖD¶ÏóÅÏ輶 */
    
24.         TIM3_NVIC_Configuration();
    
25.   while(1)
    
26.   {
    
27.   }
    
28. }
    
29. 
    
30. /**
    
31.   ******************************************************************************
    
32.   * @file    bsp_usart1.c
    
33.   * @author  fire
    
34.   * @version V1.0
    
35.   * @date    2013-xx-xx
    
36.   * @brief   usartó|óÃbsp
    
37.   ******************************************************************************
    
38.   * @attention
    
39.   *
    
40.   * êμÑéƽì¨:ò°»e iSO STM32 ¿a·￠°å
    
41.   * ÂÛì3    :http://www.firebbs.cn
    
42.   * ìÔ±|    :http://firestm32.taobao.com
    
43.   *
    
44.   ******************************************************************************
    
45.   */
    
46.   
    
47. #include "bsp_usart1.h"
    
48. 
    
49. /**
    
50.   * @brief  USART1 GPIO ÅäÖÃ,1¤×÷Ä￡ê½ÅäÖá￡9600 8-N-1
    
51.   * @param  ÎT
    
52.   * @retval ÎT
    
53.   */
    
54. void USART1_Config(void)
    
55. {
    
56.         GPIO_InitTypeDef GPIO_InitStructure;
    
57.         USART_InitTypeDef USART_InitStructure;
    
58.        
    
59.         /* config USART1 clock */
    
60.         RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
    
61.        
    
62.         /* USART1 GPIO config */
    
63.         /* Configure USART1 Tx (PA.09) as alternate function push-pull */
    
64.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    
65.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    
66.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
67.         GPIO_Init(GPIOA, &GPIO_InitStructure);   
    
68.         /* Configure USART1 Rx (PA.10) as input floating */
    
69.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    
70.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    
71.         GPIO_Init(GPIOA, &GPIO_InitStructure);
    
72.        
    
73.         /* USART1 mode config */
    
74.         USART_InitStructure.USART_BaudRate = 115200;
    
75.         USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    
76.         USART_InitStructure.USART_StopBits = USART_StopBits_1;
    
77.         USART_InitStructure.USART_Parity = USART_Parity_No ;
    
78.         USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    
79.         USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
80.         USART_Init(USART1, &USART_InitStructure);
    
81.        
    
82.         /* ê1Äü′®¿ú1½óêÕÖD¶Ï */
    
83.         USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    
84.        
    
85.         USART_Cmd(USART1, ENABLE);
    
86. }
    
87. 
    
88. /// ÅäÖÃUSART1½óêÕÖD¶Ï
    
89. void NVIC_Configuration(void)
    
90. {
    
91.         NVIC_InitTypeDef NVIC_InitStructure;
    
92.         /* Configure the NVIC Preemption Priority Bits */  
    
93.         NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
    
94.        
    
95.         /* Enable the USARTy Interrupt */
    
96.         NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;         
    
97.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    
98.         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    
99.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    
100.         NVIC_Init(&NVIC_InitStructure);
     
101. }
     
102. 
     
103. int fputc(int ch, FILE *f)
     
104. {
     
105.                 USART_SendData(USART1, (uint8_t) ch);
     
106.                
     
107.                 /* μè′y·￠Ëííê±Ï */
     
108.                 while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);               
     
109.        
     
110.                 return (ch);
     
111. }
     
112. 
     
113. int fgetc(FILE *f)
     
114. {
     
115.                 /* μè′y′®¿ú1êäèëêy¾Y */
     
116.                 while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
     
117. 
     
118.                 return (int)USART_ReceiveData(USART1);
     
119. }
     
120. 
     
121. /**
     
122. 
     
123. 
     
124. #include "bsp_TiMbase.h"
     
125. 
     
126. void TIM3_GPIO_Config(void)
     
127. {
     
128.         GPIO_InitTypeDef GPIO_InitStructure;
     
129. 
     
130.         /* éèÖÃTIM3CLK Îa 72MHZ */
     
131.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
     
132. 
     
133.   /* GPIOA clock enable */
     
134.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
     
135.         GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
     
136.         GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;
     
137.         GPIO_Init(GPIOA,&GPIO_InitStructure);
     
138. }
     
139. 
     
140. /// TIM3ÖD¶ÏóÅÏ輶ÅäÖÃ
     
141. void TIM3_NVIC_Configuration(void)
     
142. {
     
143.     NVIC_InitTypeDef NVIC_InitStructure;
     
144.    
     
145.     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);                                                                                                         
     
146.     NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;          
     
147.     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
     
148.     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;       
     
149.     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
     
150.     NVIC_Init(&NVIC_InitStructure);
     
151. }
     
152. 
     
153. void TIM3_Configuration(void)
     
154. {
     
155.   TIM_ICInitTypeDef TIM_ICInitStructure;
     
156.         TIM_ICInitStructure.TIM_Channel=TIM_Channel_2;
     
157.         TIM_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Rising;
     
158.         TIM_ICInitStructure.TIM_ICSelection=TIM_ICSelection_DirectTI;
     
159.         TIM_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;
     
160.         TIM_ICInitStructure.TIM_ICFilter=0x3;
     
161.         TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
     
162.        
     
163.         TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
     
164. 
     
165.   /* Select the slave Mode: Reset Mode */
     
166.   TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
     
167. 
     
168.   /* Enable the Master/Slave Mode */
     
169.   TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
     
170.         TIM_Cmd(TIM3,ENABLE);
     
171.         TIM_ITConfig(TIM3,TIM_IT_CC2,ENABLE);
     
172. }
     
173. 
     
174. 中断服务函数：
     
175. void TIM3_IRQHandler(void)
     
176. {                
     
177.           /* Clear TIM3 Capture compare interrupt pending bit */
     
178.   TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
     
179. 
     
180.   /* Get the Input Capture value */
     
181.   IC2Value = TIM_GetCapture2(TIM3);
     
182. 
     
183.   if (IC2Value != 0)
     
184.   {
     
185.     /* Duty cycle computation */
     
186.     DutyCycle = (TIM_GetCapture1(TIM3) * 100) / IC2Value;
     
187. 
     
188.     /* Frequency computation */
     
189.     Frequency = 72000000 / IC2Value;
     
190.   }
     
191.   else
     
192.   {
     
193.     DutyCycle = 0;
     
194.     Frequency = 0;
     
195.   }
     
196.         printf("Frequency:%d\n",Frequency);
     
197.         printf("DutyCycle:%d\n",DutyCycle);
     
198. }
     
199. void USART1_IRQHandler(void)
     
200. {
     
201.         USART_ClearITPendingBit(USART1, USART_IT_TC);
     
202. }
     
203. 
     
204. 
     

复制代码

flyleaf

检查下定时器该通道的引脚是不是被板子上其它的器件占用了。

allenzhou

flyleaf 发表于 2015-7-29 09:02
检查下定时器该通道的引脚是不是被板子上其它的器件占用了。

没有啊。我参照TIM2的改成TIM3的就不行了

flyleaf

allenzhou 发表于 2015-7-29 09:47
没有啊。我参照TIM2的改成TIM3的就不行了

看不出问题，你把TIM_GetCapture2(TIM3)和TIM_GetCapture1(TIM3)的值输出来看看有没有正常

allenzhou

flyleaf 发表于 2015-7-29 09:53
看不出问题，你把TIM_GetCapture2(TIM3)和TIM_GetCapture1(TIM3)的值输出来看看有没有正常

就是根本没有值，直接就是0

fighting12

请问弄出来没有啊？