1.CubeMx的配置步骤
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- P& X. d& \; q修改PA2，PA3为定时器15的通道1和通道2。
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0 g) F  s8 O; S2.生成工程
点击GENERATE CODE生成代码后点击Open Project即可。


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  O- a( F! ~* _, I, c3.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. 
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6. void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim);
   
7. void HAL_TIM_OC_DelayElapsedCallback(TIM_HandleTypeDef *htim);
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8. 
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9. #endif
   
10. 
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interrupt.c:

1. #include "interrupt.h"
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2. #include "lcd.h"
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3. #include "stdio.h"
   
4. unsigned int Period = 0;
   
5. unsigned int HighTime = 0;
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6. unsigned char OC1_Duty = 25;
   
7. unsigned char OC2_Duty = 75;
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8. unsigned short OC1_Pulse = 1000;
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9. unsigned short OC2_Pulse = 4000;
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10. 
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11. 
    
12. void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
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13. {
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14.         if(htim->Instance == TIM2)
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15.         {
    
16.                 if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
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17.                 {
    
18.                         Period = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1); //读取直接通道
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19.                         HighTime = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2); //读取间接通道
    
20.                         __HAL_TIM_SetCounter(htim, 0);
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21.                         HAL_TIM_IC_Start_IT(htim, TIM_CHANNEL_1); //开启中断以便于下次采值
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22.                         HAL_TIM_IC_Start_IT(htim, TIM_CHANNEL_2);
    
23.                 }
    
24.         }
    
25. }
    
26. 
    
27. void HAL_TIM_OC_DelayElapsedCallback(TIM_HandleTypeDef *htim)
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28. {
    
29.         if(htim->Instance == TIM15)
    
30.         {
    
31.                 unsigned short CapVal = 0;
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32.                 if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
    
33.                 {
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34.                         CapVal = __HAL_TIM_GetCompare(htim, TIM_CHANNEL_1);
    
35.                         if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_2) == GPIO_PIN_RESET)
    
36.                         {
    
37.                                 __HAL_TIM_SET_COMPARE(htim, TIM_CHANNEL_1, CapVal + OC1_Pulse - OC1_Duty / 100.0 * OC1_Pulse);
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38.                         }
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39.                         else
    
40.                         {
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41.                                 __HAL_TIM_SET_COMPARE(htim, TIM_CHANNEL_1, CapVal + OC1_Duty / 100.0 * OC1_Pulse);
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42.                         }
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43.                                
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44.                 }
    
45.                 else if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
    
46.                 {
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47.                         CapVal = __HAL_TIM_GetCompare(htim, TIM_CHANNEL_2);
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48.                         if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_3) == GPIO_PIN_RESET)
    
49.                         {
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50.                                 __HAL_TIM_SetCompare(htim, TIM_CHANNEL_2, CapVal + (1 - OC2_Duty / 100.0) * OC2_Pulse);
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51.                         }
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52.                         else
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53.                         {
    
54.                                 __HAL_TIM_SetCompare(htim, TIM_CHANNEL_2, CapVal + OC2_Duty / 100.0 * OC2_Pulse);
    
55.                         }
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56.                 }
    
57.         }
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58. }
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59. 
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main.c:

1. /* USER CODE BEGIN Header */
   
2. /**
   
3.   ******************************************************************************
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4.   * @file           : main.c
   
5.   * @brief          : Main program body
   
6.   ******************************************************************************
   
7.   * @attention
   
8.   *
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9.   * <h2><center>© Copyright (c) 2023 STMicroelectronics.
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10.   * All rights reserved.</center></h2>
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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
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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.   *
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17.   ******************************************************************************
    
18.   */
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19. /* USER CODE END Header */
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20. /* Includes ------------------------------------------------------------------*/
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21. #include "main.h"
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22. #include "tim.h"
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23. #include "gpio.h"
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24. 
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25. /* Private includes ----------------------------------------------------------*/
    
26. /* USER CODE BEGIN Includes */
    
27. #include "lcd.h"
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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. 
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34. /* USER CODE END PTD */
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35. 
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36. /* Private define ------------------------------------------------------------*/
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37. /* USER CODE BEGIN PD */
    
38. /* USER CODE END PD */
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39. 
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40. /* Private macro -------------------------------------------------------------*/
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41. /* USER CODE BEGIN PM */
    
42. 
    
43. /* USER CODE END PM */
    
44. 
    
45. /* Private variables ---------------------------------------------------------*/
    
46. 
    
47. /* USER CODE BEGIN PV */
    
48. extern unsigned int Period;
    
49. extern unsigned int HighTime;
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50. char text[30];
    
51. /* USER CODE END PV */
    
52. 
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53. /* Private function prototypes -----------------------------------------------*/
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54. void SystemClock_Config(void);
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55. /* USER CODE BEGIN PFP */
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56. 
    
57. /* USER CODE END PFP */
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58. 
    
59. /* Private user code ---------------------------------------------------------*/
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60. /* USER CODE BEGIN 0 */
    
61. 
    
62. /* USER CODE END 0 */
    
63. 
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64. /**
    
65.   * @brief  The application entry point.
    
66.   * @retval int
    
67.   */
    
68. int main(void)
    
69. {
    
70.   /* USER CODE BEGIN 1 */
    
71. 
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72.   /* USER CODE END 1 */
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73. 
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74.   /* MCU Configuration--------------------------------------------------------*/
    
75. 
    
76.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    
77.   HAL_Init();
    
78. 
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79.   /* USER CODE BEGIN Init */
    
80. 
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81.   /* USER CODE END Init */
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82. 
    
83.   /* Configure the system clock */
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84.   SystemClock_Config();
    
85. 
    
86.   /* USER CODE BEGIN SysInit */
    
87. 
    
88.   /* USER CODE END SysInit */
    
89. 
    
90.   /* Initialize all configured peripherals */
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91.   MX_GPIO_Init();
    
92.   MX_TIM2_Init();
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93.   MX_TIM15_Init();
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94.   MX_TIM3_Init();
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95.   /* USER CODE BEGIN 2 */
    
96.         HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
    
97.         HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);
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98.         HAL_TIM_OC_Start_IT(&htim15, TIM_CHANNEL_1);
    
99.         HAL_TIM_OC_Start_IT(&htim15, TIM_CHANNEL_2);
    
100.         LCD_Init();
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101.         LCD_Clear(Black);
     
102.         LCD_SetBackColor(Black);
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103.         LCD_SetTextColor(White);
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104.   /* USER CODE END 2 */
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105. 
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106.   /* Infinite loop */
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107.   /* USER CODE BEGIN WHILE */
     
108.   while (1)
     
109.   {
     
110.     /* USER CODE END WHILE */
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111. 
     
112.     /* USER CODE BEGIN 3 */
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113.                 sprintf(text, "frq:%.2f   ", 1000000.0 / Period); //分频成1MHz所以这里1000000.0作为被除数
     
114.                 LCD_DisplayStringLine(Line0,  text);
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115.                 sprintf(text, "Duty:%.2f   ", HighTime / (float)Period * 100); //占空比为高电平时间 / 周期 * 100%
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116.                 LCD_DisplayStringLine(Line1,  text);
     
117.   }
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118.   /* USER CODE END 3 */
     
119. }
     
120. 
     
121. /**
     
122.   * @brief System Clock Configuration
     
123.   * @retval None
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124.   */
     
125. void SystemClock_Config(void)
     
126. {
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127.   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
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128.   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
     
129. 
     
130.   /** Configure the main internal regulator output voltage
     
131.   */
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132.   HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
     
133.   /** Initializes the RCC Oscillators according to the specified parameters
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134.   * in the RCC_OscInitTypeDef structure.
     
135.   */
     
136.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
     
137.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
     
138.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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139.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
     
140.   RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV3;
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141.   RCC_OscInitStruct.PLL.PLLN = 20;
     
142.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
     
143.   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
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144.   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
     
145.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
     
146.   {
     
147.     Error_Handler();
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148.   }
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149.   /** Initializes the CPU, AHB and APB buses clocks
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150.   */
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151.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
     
152.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
     
153.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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154.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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155.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
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156.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
     
157. 
     
158.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
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159.   {
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160.     Error_Handler();
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161.   }
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162. }
     
163. 
     
164. /* USER CODE BEGIN 4 */
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165. 
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166. /* USER CODE END 4 */
     
167. 
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168. /**
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169.   * @brief  This function is executed in case of error occurrence.
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170.   * @retval None
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171.   */
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172. void Error_Handler(void)
     
173. {
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174.   /* USER CODE BEGIN Error_Handler_Debug */
     
175.   /* User can add his own implementation to report the HAL error return state */
     
176.   __disable_irq();
     
177.   while (1)
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178.   {
     
179.   }
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180.   /* USER CODE END Error_Handler_Debug */
     
181. }
     
182. 
     
183. #ifdef  USE_FULL_ASSERT
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184. /**
     
185.   * @brief  Reports the name of the source file and the source line number
     
186.   *         where the assert_param error has occurred.
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187.   * @param  file: pointer to the source file name
     
188.   * @param  line: assert_param error line source number
     
189.   * @retval None
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190.   */
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191. void assert_failed(uint8_t *file, uint32_t line)
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192. {
     
193.   /* USER CODE BEGIN 6 */
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194.   /* User can add his own implementation to report the file name and line number,
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195.      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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196.   /* USER CODE END 6 */
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197. }
     
198. #endif /* USE_FULL_ASSERT */
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199. 
     
200. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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201. 
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总结
; n% w; r$ S, w7 T9 k从结果来看我们目标是PA2输出1000Hz占空比为25%的PWM波但最后测量频率为1026和23%的波形，误差比较大。PA3目标输出250Hz占空比为75%的PWM波，但最后输出的是252.84Hz和74.72%的PWM波，误差虽然存在但与PA2输出的波形比较，误差算是少一点，我们可以知道OC输出高频率PWM波时存在很严重的波形失真现象，但在输出低频率PWM波时这种情况就好一点，TIM的PWM模式不会有这样的问题但是PWM模式下定时器各个通道输出PWM波频率相同(占空比可以不同)，不能实现每个通道占空比不同且频率也不同的情况。OC模式下虽然不支持输出高频率PWM波，但是它能实现每个通道的PWM波频率不同占空比也不同。


以上就是OC的配置过程，测试代码以及测试效果
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