IC
0 U2 I- e$ X; I/ l' M  [" T: K1.原理图以及配置元素

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6 T$ `) f$ w. F) ^由图可知PA15为输入捕获接口与一个XL555信号发生器连在了一起。


2.CubeMx的配置步骤


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3.生成工程
点击GENERATE CODE生成代码后点击Open Project即可。

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4.测试代码
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1. #ifndef __INTERRUPT_H__
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2. #define __INTERRUPT_H__
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3. 
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4. #include "main.h"
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5. 
   
6. void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim);
   
7. 
   
8. #endif
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9. 
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1. #include "interrupt.h"
   
2. 
   
3. unsigned int Period = 0;
   
4. unsigned int HighTime = 0;
   
5. 
   
6. void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
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7. {
   
8.         if(htim->Instance == TIM2)
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9.         {
   
10.                 if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
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11.                 {
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12.                         Period = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1); //读取直接通道
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13.                         HighTime = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2); //读取间接通道
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14.                         __HAL_TIM_SetCounter(htim, 0);
    
15.                         HAL_TIM_IC_Start_IT(htim, TIM_CHANNEL_1); //开启中断以便于下次采值
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16.                         HAL_TIM_IC_Start_IT(htim, TIM_CHANNEL_2);
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17.                 }
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18.         }
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19. }
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20. 
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main.c
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1. /* USER CODE BEGIN Header */
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2. /**
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3.   ******************************************************************************
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4.   * @file           : main.c
   
5.   * @brief          : Main program body
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6.   ******************************************************************************
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7.   * @attention
   
8.   *
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9.   * <h2><center>© Copyright (c) 2023 STMicroelectronics.
   
10.   * All rights reserved.</center></h2>
    
11.   *
    
12.   * This software component is licensed by ST under BSD 3-Clause license,
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13.   * the "License"; You may not use this file except in compliance with the
    
14.   * License. You may obtain a copy of the License at:
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15.   *                        opensource.org/licenses/BSD-3-Clause
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16.   *
    
17.   ******************************************************************************
    
18.   */
    
19. /* USER CODE END Header */
    
20. /* Includes ------------------------------------------------------------------*/
    
21. #include "main.h"
    
22. #include "tim.h"
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23. #include "gpio.h"
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24. 
    
25. /* Private includes ----------------------------------------------------------*/
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26. /* USER CODE BEGIN Includes */
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27. #include "lcd.h"
    
28. #include "stdio.h"
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29. /* USER CODE END Includes */
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30. 
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31. /* Private typedef -----------------------------------------------------------*/
    
32. /* USER CODE BEGIN PTD */
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33. 
    
34. /* USER CODE END PTD */
    
35. 
    
36. /* Private define ------------------------------------------------------------*/
    
37. /* USER CODE BEGIN PD */
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38. /* USER CODE END PD */
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39. 
    
40. /* Private macro -------------------------------------------------------------*/
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41. /* USER CODE BEGIN PM */
    
42. 
    
43. /* USER CODE END PM */
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44. 
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45. /* Private variables ---------------------------------------------------------*/
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46. 
    
47. /* USER CODE BEGIN PV */
    
48. extern unsigned int Period;
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49. extern unsigned int HighTime;
    
50. char text[30];
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51. /* USER CODE END PV */
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52. 
    
53. /* Private function prototypes -----------------------------------------------*/
    
54. void SystemClock_Config(void);
    
55. /* USER CODE BEGIN PFP */
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56. 
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57. /* USER CODE END PFP */
    
58. 
    
59. /* Private user code ---------------------------------------------------------*/
    
60. /* USER CODE BEGIN 0 */
    
61. 
    
62. /* USER CODE END 0 */
    
63. 
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64. /**
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65.   * @brief  The application entry point.
    
66.   * @retval int
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67.   */
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68. int main(void)
    
69. {
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70.   /* USER CODE BEGIN 1 */
    
71. 
    
72.   /* USER CODE END 1 */
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73. 
    
74.   /* MCU Configuration--------------------------------------------------------*/
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75. 
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76.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
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77.   HAL_Init();
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78. 
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79.   /* USER CODE BEGIN Init */
    
80. 
    
81.   /* USER CODE END Init */
    
82. 
    
83.   /* Configure the system clock */
    
84.   SystemClock_Config();
    
85. 
    
86.   /* USER CODE BEGIN SysInit */
    
87. 
    
88.   /* USER CODE END SysInit */
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89. 
    
90.   /* Initialize all configured peripherals */
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91.   MX_GPIO_Init();
    
92.   MX_TIM2_Init();
    
93.   /* USER CODE BEGIN 2 */
    
94.         HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
    
95.         HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);
    
96.         LCD_Init();
    
97.         LCD_Clear(Black);
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98.         LCD_SetBackColor(Black);
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99.         LCD_SetTextColor(White);
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100.   /* USER CODE END 2 */
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101. 
     
102.   /* Infinite loop */
     
103.   /* USER CODE BEGIN WHILE */
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104.   while (1)
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105.   {
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106.     /* USER CODE END WHILE */
     
107. 
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108.     /* USER CODE BEGIN 3 */
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109.                 sprintf(text, "frq:%.2f", 1000000.0 / Period); //分频成1MHz所以这里1000000.0作为被除数
     
110.                 LCD_DisplayStringLine(Line0,  text);
     
111.                 sprintf(text, "Duty:%.2f", HighTime / (float)Period * 100); //占空比为高电平时间 / 周期 * 100%
     
112.                 LCD_DisplayStringLine(Line1,  text);
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113.   }
     
114.   /* USER CODE END 3 */
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115. }
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116. 
     
117. /**
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118.   * @brief System Clock Configuration
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119.   * @retval None
     
120.   */
     
121. void SystemClock_Config(void)
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122. {
     
123.   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
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124.   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
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125. 
     
126.   /** Configure the main internal regulator output voltage
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127.   */
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128.   HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
     
129.   /** Initializes the RCC Oscillators according to the specified parameters
     
130.   * in the RCC_OscInitTypeDef structure.
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131.   */
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132.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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133.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
     
134.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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135.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
     
136.   RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV3;
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137.   RCC_OscInitStruct.PLL.PLLN = 20;
     
138.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
     
139.   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
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140.   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
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141.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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142.   {
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143.     Error_Handler();
     
144.   }
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145.   /** Initializes the CPU, AHB and APB buses clocks
     
146.   */
     
147.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
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148.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
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149.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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150.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
     
151.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
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152.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
     
153. 
     
154.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
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155.   {
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156.     Error_Handler();
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157.   }
     
158. }
     
159. 
     
160. /* USER CODE BEGIN 4 */
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161. 
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162. /* USER CODE END 4 */
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163. 
     
164. /**
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165.   * @brief  This function is executed in case of error occurrence.
     
166.   * @retval None
     
167.   */
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168. void Error_Handler(void)
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169. {
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170.   /* USER CODE BEGIN Error_Handler_Debug */
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171.   /* User can add his own implementation to report the HAL error return state */
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172.   __disable_irq();
     
173.   while (1)
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174.   {
     
175.   }
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176.   /* USER CODE END Error_Handler_Debug */
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177. }
     
178. 
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179. #ifdef  USE_FULL_ASSERT
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180. /**
     
181.   * @brief  Reports the name of the source file and the source line number
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182.   *         where the assert_param error has occurred.
     
183.   * @param  file: pointer to the source file name
     
184.   * @param  line: assert_param error line source number
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185.   * @retval None
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186.   */
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187. void assert_failed(uint8_t *file, uint32_t line)
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188. {
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189.   /* USER CODE BEGIN 6 */
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190.   /* User can add his own implementation to report the file name and line number,
     
191.      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
     
192.   /* USER CODE END 6 */
     
193. }
     
194. #endif /* USE_FULL_ASSERT */
     
195. 
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196. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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197. 
     

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5.演示效果
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