基于STM32的CPU利用率计算的代码实现

以下是基于STM32的CPU利用率计算的代码实现：

#include "stm32f4xx.h"
#include "stm32f4xx_hal.h"
#include "cmsis_os.h"

#define IDLE_TASK_STACK_SIZE 128
#define TASK_1_STACK_SIZE    128
#define TASK_2_STACK_SIZE    128

#define IDLE_TASK_PRIORITY  osPriorityIdle
#define TASK_1_PRIORITY     osPriorityNormal
#define TASK_2_PRIORITY     osPriorityNormal

#define IDLE_TASK_NAME  "IdleTask"
#define TASK_1_NAME     "Task1"
#define TASK_2_NAME     "Task2"

void idle_task(void const * argument);
void task1(void const * argument);
void task2(void const * argument);

osThreadId idleTaskHandle;
osThreadId task1Handle;
osThreadId task2Handle;

uint32_t idleTaskCpuTime;
uint32_t task1CpuTime;
uint32_t task2CpuTime;
uint32_t totalCpuTime;

int main(void)
{
  HAL_Init();
  SystemClock_Config();

  osThreadDef(idleTask, idle_task, IDLE_TASK_PRIORITY, 0, IDLE_TASK_STACK_SIZE);
  idleTaskHandle = osThreadCreate(osThread(idleTask), NULL);
  osThreadSetName(idleTaskHandle, IDLE_TASK_NAME);

  osThreadDef(task1, task1, TASK_1_PRIORITY, 0, TASK_1_STACK_SIZE);
  task1Handle = osThreadCreate(osThread(task1), NULL);
  osThreadSetName(task1Handle, TASK_1_NAME);

  osThreadDef(task2, task2, TASK_2_PRIORITY, 0, TASK_2_STACK_SIZE);
  task2Handle = osThreadCreate(osThread(task2), NULL);
  osThreadSetName(task2Handle, TASK_2_NAME);

  osKernelStart();
}

void idle_task(void const * argument)
{
  for (;;)
  {
    idleTaskCpuTime++;
  }
}

void task1(void const * argument)
{
  for (;;)
  {
    task1CpuTime++;
    osDelay(100);
  }
}

void task2(void const * argument)
{
  for (;;)
  {
    task2CpuTime++;
    osDelay(50);
  }
}

void SysTick_Handler(void)
{
  totalCpuTime++;
}

void HAL_MspInit(void)
{
  __HAL_RCC_SYSCFG_CLK_ENABLE();
  __HAL_RCC_PWR_CLK_ENABLE();
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 360;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
}

该代码利用了FreeRTOS操作系统来创建三个任务：一个空闲任务和两个周期性任务。空闲任务将会一直运行，计算CPU空闲时间。两个周期性任务分别每隔100ms和50ms运行一次，计算CPU占用时间。同时，SysTick中断被用来计算总CPU时间。最终，可以通过简单的计算来计算CPU利用率。