为了呈现 STM32H563ZI 接近MPU的性能，本次测试使用freeRTOS系统进行PWM和GPIO的测试。首先，需要安装STM32Cube的STM32H5的freeRTOS系统模块，新建项目时选择“ACCESS TO EXAMPLE SELECTOR”项目，选择开发板NUCLEO-H563ZI，选择FreeRTOS_Semaphore_LowPower项目。项目默认打开了PWR管理，还有三个LED外设。我们的评测是使用一个低功耗定时器 LPTIM4 作为信号源来控制 GPIO 的输出。

1. /* USER CODE BEGIN Header */
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2. /**
   
3.   ******************************************************************************
   
4.   * File Name          : app_freertos.c
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5.   * Description        : Code for freertos applications
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6.   ******************************************************************************
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7.   * @attention *
   
8.   * Copyright (c) 2023 STMicroelectronics.
   
9.   * All rights reserved.
   
10.   *
    
11.   * This software is licensed under terms that can be found in the LICENSE file
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12.   * in the root directory of this software component.
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13.   * If no LICENSE file comes with this software, it is provided AS-IS.
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14.   *
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15.   ******************************************************************************
    
16.   */
    
17. /* USER CODE END Header */
    
18. /* Includes ------------------------------------------------------------------*/
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19. #include "FreeRTOS.h"
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20. #include "task.h"
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21. #include "main.h"
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22. #include "cmsis_os2.h"
    
23. /* Private includes ----------------------------------------------------------*/
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24. /* USER CODE BEGIN Includes */
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25. /* USER CODE END Includes */
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26. /* Private typedef -----------------------------------------------------------*/
    
27. /* USER CODE BEGIN PTD */
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28. /* USER CODE END PTD */
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29. /* Private define ------------------------------------------------------------*/
    
30. /* USER CODE BEGIN PD */
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31. #define DEFAULT_TIMEOUT (1000)
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32. /* USER CODE END PD */
    
33. /* Private macro -------------------------------------------------------------*/
    
34. /* USER CODE BEGIN PM */
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35. /* USER CODE END PM */
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36. /* Private variables ---------------------------------------------------------*/
    
37. /* USER CODE BEGIN Variables */
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38. extern LPTIM_HandleTypeDef hlptim4;
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39. /* USER CODE END Variables */
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40. /* Definitions for MainThread */
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41. osThreadId_t MainThreadHandle;
    
42. const osThreadAttr_t MainThread_attributes = {
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43.   .name = "MainThread",
    
44.   .priority = (osPriority_t) osPriorityNormal,
    
45.   .stack_size = 256 * 4
    
46. };
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47. /* Definitions for BinarySemaphore */
    
48. osSemaphoreId_t BinarySemaphoreHandle;
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49. const osSemaphoreAttr_t BinarySemaphore_attributes = {
    
50.   .name = "BinarySemaphore"
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51. };
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52. /* Private function prototypes -----------------------------------------------*/
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53. /* USER CODE BEGIN FunctionPrototypes */
    
54. void SystemClock_Config(void);
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55. /* USER CODE END FunctionPrototypes */
    
56. void MainThread_Entry(void *argument);
    
57. void MX_FREERTOS_Init(void); /* (MISRA C 2004 rule 8.1) */
    
58. /* USER CODE BEGIN PREPOSTSLEEP */
    
59. void PreSleepProcessing(uint32_t ulExpectedIdleTime)
    
60. {
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61.   /* This is needed to prevent TIM6 from triggering an interrupt,
    
62.    * which could prevent the CPU from entering STOP mode */
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63.   HAL_SuspendTick();
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64.   /* Start low power timer */
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65.   HAL_LPTIM_TimeOut_Start_IT(&hlptim4, DEFAULT_TIMEOUT);
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66.   /* Enter STOP mode */
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67.   HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
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68. }
    
69. void PostSleepProcessing(uint32_t ulExpectedIdleTime)
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70. {
    
71.   /* Restore Clock settings */
    
72.   SystemClock_Config();
    
73.   /* Resume HAL timebase */
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74.   HAL_ResumeTick();
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75. }
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76. /* USER CODE END PREPOSTSLEEP */
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77. /**
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78.   * @brief FreeRTOS initialization
    
79.   * @param  None
    
80.   * @retval None
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81.   */
    
82. void MX_FREERTOS_Init(void) {
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83.   /* USER CODE BEGIN Init */
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84.   /* USER CODE END Init */
    
85.   /* USER CODE BEGIN RTOS_MUTEX */
    
86.   /* add mutexes, ... */
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87.   /* USER CODE END RTOS_MUTEX */
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88.   /* creation of BinarySemaphore */
    
89.   BinarySemaphoreHandle = osSemaphoreNew(1, 1, &BinarySemaphore_attributes);
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90.   /* USER CODE BEGIN RTOS_SEMAPHORES */
    
91.   /* add semaphores, ... */
    
92.   /* USER CODE END RTOS_SEMAPHORES */
    
93.   /* USER CODE BEGIN RTOS_TIMERS */
    
94.   /* start timers, add new ones, ... */
    
95.   /* USER CODE END RTOS_TIMERS */
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96.   /* USER CODE BEGIN RTOS_QUEUES */
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97.   /* add queues, ... */
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98.   /* USER CODE END RTOS_QUEUES */
    
99.   /* creation of MainThread */
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100.   MainThreadHandle = osThreadNew(MainThread_Entry, NULL, &MainThread_attributes);
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101.   /* USER CODE BEGIN RTOS_THREADS */
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102.   /* add threads, ... */
     
103.   /* USER CODE END RTOS_THREADS */
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104.   /* USER CODE BEGIN RTOS_EVENTS */
     
105.   /* add events, ... */
     
106.   /* USER CODE END RTOS_EVENTS */
     
107. }
     
108. /* USER CODE BEGIN Header_MainThread_Entry */
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109. /**
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110. * @brief Function implementing the MainThread thread.
     
111. * @param argument: Not used
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112. * @retval None
     
113. */
     
114. /* USER CODE END Header_MainThread_Entry */
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115. void MainThread_Entry(void *argument)
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116. {
     
117.   /* USER CODE BEGIN MainThread */
     
118.   /* Infinite loop */
     
119.   for(;;osSemaphoreAcquire(BinarySemaphoreHandle, osWaitForever))
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120.   {
     
121.     HAL_GPIO_TogglePin(LED1_GREEN_GPIO_Port, LED1_GREEN_Pin);
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122.   }
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123.   /* USER CODE END MainThread */
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124. }
     
125. /* Private application code --------------------------------------------------*/
     
126. /* USER CODE BEGIN Application */
     
127. void HAL_LPTIM_CompareMatchCallback(LPTIM_HandleTypeDef *hlptim)
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128. {
     
129.   if(hlptim->Instance == LPTIM4)
     
130.   {
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131.     osSemaphoreRelease(BinarySemaphoreHandle);
     
132.     HAL_LPTIM_TimeOut_Stop_IT(&hlptim4);
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133.   }
     
134. }
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135. /* USER CODE END Application */

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程序中首先声明了一个信号量 BinarySemaphoreHandle，作为 GPIO 的控制开关，然后在中断回调 HAL_LPTIM_CompareMatchCallback 中生成这个信号量。

1. 
   
2. //信号量
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3. osSemaphoreId_t BinarySemaphoreHandle;
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4. //回调函数/* Private application code --------------------------------------------------*//* USER CODE BEGIN Application */void HAL_LPTIM_CompareMatchCallback(LPTIM_HandleTypeDef *hlptim)
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5. {
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6.   if(hlptim->Instance == LPTIM4)
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7.   {
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8.     osSemaphoreRelease(BinarySemaphoreHandle);
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9.     HAL_LPTIM_TimeOut_Stop_IT(&hlptim4);
   
10.   }
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11. }

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信号生成后，等待系统自己调度，这时需要将LPTIM4中断关掉。HAL_LPTIM_TimeOut_Stop_IT(&hlptim4);

1. 
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2. /* USER CODE END Header_MainThread_Entry */void MainThread_Entry(void *argument)
   
3. {
   
4.   /* USER CODE BEGIN MainThread */
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5.   /* Infinite loop */
   
6.   for(;;osSemaphoreAcquire(BinarySemaphoreHandle, osWaitForever))
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7.   {
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8.     HAL_GPIO_TogglePin(LED2_YELLOW_GPIO_Port, LED2_YELLOW_Pin);
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9.   }
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10.   /* USER CODE END MainThread */
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11. }
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信号到达后翻转GPIO输出，系统运行后LED2，进入不停的闪烁。
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+ N) z% W2 x$ ^6 J来源：EEWORLD论坛网友bigbat  版权归原作者所有


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