freeRtos学习笔记 (9) 移植和CPU利用率统计
2024-05-30 05:58:47
freeRtos学习笔记 (9) 移植和CPU利用率统计
使用官方固件移植
首先准备一个能跑的裸机工程
- 注意，freertos需要使用systick定时器，而stm32HAL库默认使用systick作为时基
- 方法一 ：可以在stm32CUBEMX创建工程时修改HAL库时基使用的定时器
- 方法二 ：修改HAL库关于时基的函数
由于这两个函数HAL库中都是带__weak前缀的（如果用户不提供则用该函数，如果用户重写则会覆盖带__weak前缀的函数），直接写自己的即可
/*!* @brief 汇编延时** @param ulCount:延时时钟数** @return 无** @note ulCount每增加1，该函数增加6个时钟（M4是3个时钟）** @see */
#if defined (__CC_ARM) /*!< ARM Compiler */
__asm void userDelay(unsigned long ulCount)
{subs r0, #1;bne userDelay;bx lr;
}
#elif defined ( __ICCARM__ ) /*!< IAR Compiler */
void userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne.n userDelay\n"" bx lr");
}#elif defined (__GNUC__) /*!< GNU Compiler */
void __attribute__((naked)) userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne userDelay\n"" bx lr");
}#elif defined (__TASKING__) /*!< TASKING Compiler */
/*?*/
#endif /* __CC_ARM */
#include "FreeRTOS.h"
#include "task.h"
uint32_t HAL_GetTick (void)
{static uint32_t ticks = 0U;if (xTaskGetSchedulerState() == taskSCHEDULER_RUNNING){return ((uint32_t)xTaskGetTickCount());}/* 如果OS还没有运行，采用下面方式 */userDelay((SystemCoreClock/6000));return ++ticks;
}HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority)
{return HAL_OK;
}
下载freeRtos固件
下载地址 https://freertos.org/a00104.html
GitHub地址 https://github.com/FreeRTOS/FreeRTOS
将freeRtos添加进工程
- 将下载后的freeRtos固件解压，将Source文件夹复制到准备好的裸机工程中并将文件夹名由Source改为FreeRtos
- 向工程中添加一个FreeRTOSConfig.h文件模板，并根据要求自行裁剪
#ifndef FREERTOS_CONFIG_H
#define FREERTOS_CONFIG_H/*-----------------------------------------------------------* Application specific definitions.** These definitions should be adjusted for your particular hardware and* application requirements.** THESE PARAMETERS ARE DESCRIBED WITHIN THE 'CONFIGURATION' SECTION OF THE* FreeRTOS API DOCUMENTATION AVAILABLE ON THE FreeRTOS.org WEB SITE.** See http://www.freertos.org/a00110.html*----------------------------------------------------------*/#if (defined(__ARMCC_VERSION) || defined(__GNUC__) || defined(__ICCARM__))
#include <stdint.h>extern uint32_t SystemCoreClock;
#endif/* Constants that describe the hardware and memory usage. */
#define configCPU_CLOCK_HZ (SystemCoreClock)
#define configTICK_RATE_HZ ((TickType_t)1000)
#define configTOTAL_HEAP_SIZE ((size_t)1024*40)
#define configMINIMAL_STACK_SIZE ((uint16_t)256)
#define configSUPPORT_DYNAMIC_ALLOCATION 1
#define configSUPPORT_STATIC_ALLOCATION 0/* Constants related to the behaviour or the scheduler. */
#define configMAX_PRIORITIES 5
#define configUSE_PREEMPTION 1
#define configUSE_TIME_SLICING 1
#define configIDLE_SHOULD_YIELD 0
#define configMAX_TASK_NAME_LEN (10)
#define configUSE_16_BIT_TICKS 0/* Software timer definitions. */
#define configUSE_TIMERS 1
#define configTIMER_TASK_PRIORITY 2
#define configTIMER_QUEUE_LENGTH 5
#define configTIMER_TASK_STACK_DEPTH (configMINIMAL_STACK_SIZE * 2)/* Constants that build features in or out. */
#define configUSE_MUTEXES 1
#define configUSE_RECURSIVE_MUTEXES 1
#define configUSE_COUNTING_SEMAPHORES 1
#define configUSE_QUEUE_SETS 1
#define configUSE_TASK_NOTIFICATIONS 1
#define configUSE_TRACE_FACILITY 1
#define configUSE_TICKLESS_IDLE 0
#define configUSE_APPLICATION_TASK_TAG 0
#define configUSE_NEWLIB_REENTRANT 0
#define configUSE_CO_ROUTINES 0/* Constants provided for debugging and optimisation assistance. */
#define configCHECK_FOR_STACK_OVERFLOW 0
#define configQUEUE_REGISTRY_SIZE 0
#define configASSERT( x ) if( ( x ) == 0 ) { taskDISABLE_INTERRUPTS(); for( ;; ); }/* Constants that define which hook (callback) functions should be used. */
#define configUSE_IDLE_HOOK 0
#define configUSE_TICK_HOOK 0
#define configUSE_DAEMON_TASK_STARTUP_HOOK 0
#define configUSE_MALLOC_FAILED_HOOK 0/* Port specific configuration. */
#define configENABLE_MPU 0
#define configENABLE_FPU 1
#define configENABLE_TRUSTZONE 1
#define configMINIMAL_SECURE_STACK_SIZE ((uint32_t)1024)
#define configRUN_FREERTOS_SECURE_ONLY 0/* Cortex-M specific definitions. */
#ifdef __NVIC_PRIO_BITS/* __NVIC_PRIO_BITS will be specified when CMSIS is being used. */#define configPRIO_BITS __NVIC_PRIO_BITS
#else/* 7 priority levels */#define configPRIO_BITS 4
#endif/* The lowest interrupt priority that can be used in a call to a "set priority" function. */
#define configLIBRARY_LOWEST_INTERRUPT_PRIORITY 0x0f/* The highest interrupt priority that can be used by any interrupt service* routine that makes calls to interrupt safe FreeRTOS API functions. DO NOT* CALL INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT THAT HAS A* HIGHER PRIORITY THAN THIS! (higher priorities are lower numeric values). */
#define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5/* Interrupt priorities used by the kernel port layer itself. These are generic* to all Cortex-M ports, and do not rely on any particular library functions. */
#define configKERNEL_INTERRUPT_PRIORITY (configLIBRARY_LOWEST_INTERRUPT_PRIORITY << (8 - configPRIO_BITS))/* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!* See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
#define configMAX_SYSCALL_INTERRUPT_PRIORITY (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS))/* Set the following definitions to 1 to include the API function, or zero* to exclude the API function. NOTE: Setting an INCLUDE_ parameter to 0 is* only necessary if the linker does not automatically remove functions that are* not referenced anyway. */
#define INCLUDE_vTaskPrioritySet 1
#define INCLUDE_uxTaskPriorityGet 1
#define INCLUDE_vTaskDelete 1
#define INCLUDE_vTaskSuspend 1
#define INCLUDE_vTaskDelayUntil 1
#define INCLUDE_vTaskDelay 1
#define INCLUDE_xTaskGetIdleTaskHandle 1
#define INCLUDE_xTaskAbortDelay 1
#define INCLUDE_xQueueGetMutexHolder 1
#define INCLUDE_xSemaphoreGetMutexHolder 1
#define INCLUDE_xTaskGetHandle 1
#define INCLUDE_uxTaskGetStackHighWaterMark 1
#define INCLUDE_uxTaskGetStackHighWaterMark2 1
#define INCLUDE_eTaskGetState 1
#define INCLUDE_xTaskResumeFromISR 1
#define INCLUDE_xTimerPendFunctionCall 1
#define INCLUDE_xTaskGetSchedulerState 1
#define INCLUDE_xTaskGetCurrentTaskHandle 1/* Map the FreeRTOS port interrupt handlers to their CMSIS standard names. */
#define xPortPendSVHandler PendSV_Handler
#define vPortSVCHandler SVC_Handler
#define xPortSysTickHandler SysTick_Handler#if (defined(__ARMCC_VERSION) || defined(__GNUC__) || defined(__ICCARM__))
/* Include debug event definitions */
//#include "freertos_evr.h"
#endif#endif /* FREERTOS_CONFIG_H */
将FreeRTOS文件和文件路径信息添加到工程中
heap_4.c文件和内存分配有关，可以根据需要自行选择 heap_1-4文件，不过一般选择heap_4.c文件即可
需要注意的是port.c文件，当选择不同编译器版本时，使用的port.c是不同的，AC5用的是RVDS文件夹下ARM_CM3（STM32F1系列是CM3内核的）内的port.c
AC6用的是GCC文件夹下ARM_CM3（STM32F1系列是CM3内核的）内的port.c，个人比较喜欢用AC6，因为编译速度更快，但是有个小问题，不能有中文路径 否则不能gotodef
最后记得将头文件路径告诉MDK，FreeRTOSConfig.h的头文件路径也要记得告诉MDK
屏蔽HAL库中的中断服务函数
freeRtos使用了三个中断 SVC、PenSVC、Systick。SVC只在vTaskStartScheduler中被调用一次，用作启动第一个任务，简单来说就是进入线程模式，将MSP变成PSP。PenSVC用作任务切换，Systick用作系统时基。
编写闪灯任务，验证移植结果
/*!* @brief 汇编延时** @param ulCount:延时时钟数** @return 无** @note ulCount每增加1，该函数增加6个时钟（M4是3个时钟）** @see */
#if defined (__CC_ARM) /*!< ARM Compiler */
__asm void userDelay(unsigned long ulCount)
{subs r0, #1;bne userDelay;bx lr;
}
#elif defined ( __ICCARM__ ) /*!< IAR Compiler */
void userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne.n userDelay\n"" bx lr");
}#elif defined (__GNUC__) /*!< GNU Compiler */
void __attribute__((naked)) userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne userDelay\n"" bx lr");
}#elif defined (__TASKING__) /*!< TASKING Compiler */
/*?*/
#endif /* __CC_ARM */
#include "FreeRTOS.h"
#include "task.h"
uint32_t HAL_GetTick (void)
{static uint32_t ticks = 0U;if (xTaskGetSchedulerState() == taskSCHEDULER_RUNNING){return ((uint32_t)xTaskGetTickCount());}/* 如果OS还没有运行，采用下面方式 */userDelay((SystemCoreClock/6000));return ++ticks;
}HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority)
{return HAL_OK;
}void vTaskLED(void * pvParameters)
{while(1){vTaskDelay(100);HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);}
}
static TaskHandle_t ledTaskHandle;
/*** @brief The application entry point.* @retval int*/
int main(void)
{/* 关闭中断 防止初始化过程中进入中断 因为中断服务函数中可能使用freertos API 而此时freertos还未启动 freertos启动时会自动开启中断*/taskDISABLE_INTERRUPTS();HAL_Init();SystemClock_Config();MX_GPIO_Init();BaseType_t pd = xTaskCreate(vTaskLED, "TaskLED", 128, 0, 1, &ledTaskHandle);if(pd != pdPASS){//创建任务失败}vTaskStartScheduler();while (1){}/* USER CODE END 3 */
}
CPU利用率
CPU利用率的原理就是定义一个精度至少是systick精度10倍的定时器，当任务切换时，任务控制块记录任务累计运行时长（利用高精度定时器）
- 开启高精度定时器
创建回调函数，记录高精度定时器节拍，注意高精度定时器中断会严重影响系统性能。
/* 高精度定时器计数器 */
volatile uint32_t g_ulTick = 0;
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance == TIM6){g_ulTick++;}
}
- 修改FreeRTOSConfig.h配置文件
使用FreeRTOS中自带的性能统计函数需要开启一些宏定义，任务切换时，任务控制块记录任务累计运行时长（利用高精度定时器）
#define configUSE_TRACE_FACILITY 1
#define configGENERATE_RUN_TIME_STATS 1
#define configUSE_STATS_FORMATTING_FUNCTIONS 1
#define portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() (g_ulTick = 0ul)
#define portGET_RUN_TIME_COUNTER_VALUE() g_ulTick
- 创建一个CPU利用率统计任务
为了提高效率，将printf重定向到Event Recorder中间件，详细过程参考 https://blog.csdn.net/weixin_42378319/article/details/117920784
/*!* @brief 汇编延时** @param ulCount:延时时钟数** @return 无** @note ulCount每增加1，该函数增加6个时钟（M4是3个时钟）** @see */
#if defined (__CC_ARM) /*!< ARM Compiler */
__asm void userDelay(unsigned long ulCount)
{subs r0, #1;bne userDelay;bx lr;
}
#elif defined ( __ICCARM__ ) /*!< IAR Compiler */
void userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne.n userDelay\n"" bx lr");
}#elif defined (__GNUC__) /*!< GNU Compiler */
void __attribute__((naked)) userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne userDelay\n"" bx lr");
}#elif defined (__TASKING__) /*!< TASKING Compiler */
/*?*/
#endif /* __CC_ARM */
#include "FreeRTOS.h"
#include "task.h"
#include <stdio.h>
#include "EventRecorder.h"
uint32_t HAL_GetTick (void)
{static uint32_t ticks = 0U;if (xTaskGetSchedulerState() == taskSCHEDULER_RUNNING){return ((uint32_t)xTaskGetTickCount());}/* 如果OS还没有运行，采用下面方式 */userDelay((SystemCoreClock/6000));return ++ticks;
}HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority)
{return HAL_OK;
}void vTaskLED(void * pvParameters)
{while(1){vTaskDelay(100);HAL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin);}
}void vTaskTaskUtilization(void *pvParameters)
{uint8_t ucKeyCode;uint8_t pcWriteBuffer[500];while(1){printf("=================================================\r\n");printf("任务名 任务状态 优先级 剩余栈 任务序号\r\n");vTaskList((char *)&pcWriteBuffer);printf("%s\r\n", pcWriteBuffer);printf("\r\n任务名 运行计数 使用率\r\n");vTaskGetRunTimeStats((char *)&pcWriteBuffer);printf("%s\r\n", pcWriteBuffer);vTaskDelay(2000);}
}static TaskHandle_t ledTaskHandle;
static TaskHandle_t taskUtilizationTaskHandle;
/* USER CODE END 0 *//*** @brief The application entry point.* @retval int*/
int main(void)
{/* 关闭中断 防止初始化过程中进入中断 因为中断服务函数中可能使用freertos API 而此时freertos还未启动 freertos启动时会自动开启中断*/taskDISABLE_INTERRUPTS();EventRecorderInitialize(EventRecordAll, 1);HAL_Init();SystemClock_Config();MX_GPIO_Init();MX_TIM6_Init();HAL_TIM_Base_Start_IT(&htim6);BaseType_t pd = xTaskCreate(vTaskLED, "TaskLED", 128, 0, 2, &ledTaskHandle);if(pd != pdPASS){//创建任务失败}pd = xTaskCreate(vTaskTaskUtilization, "TaskUtilization", 1024, 0, 1, &taskUtilizationTaskHandle);if(pd != pdPASS){//创建任务失败}vTaskStartScheduler();while (1);}/* 高精度定时器计数器 */
volatile uint32_t g_ulTick = 0;
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{if(htim->Instance == TIM6){g_ulTick++;}
}
使用MDK中间件移植
首先准备一个能跑的裸机工程
和使用固件库移植第一步一样
安装MDK中间件
如果网不好，可以通过 http://www.armbbs.cn/forum.php?mod=viewthread&tid=96992&highlight=pack 镜像下载后，自行安装
安装完组件后，向工程中添加组件
修改FreeRTOSConfig.h文件模板，并根据要求自行裁剪
#ifndef FREERTOS_CONFIG_H
#define FREERTOS_CONFIG_H/*-----------------------------------------------------------* Application specific definitions.** These definitions should be adjusted for your particular hardware and* application requirements.** THESE PARAMETERS ARE DESCRIBED WITHIN THE 'CONFIGURATION' SECTION OF THE* FreeRTOS API DOCUMENTATION AVAILABLE ON THE FreeRTOS.org WEB SITE.** See http://www.freertos.org/a00110.html*----------------------------------------------------------*/#if (defined(__ARMCC_VERSION) || defined(__GNUC__) || defined(__ICCARM__))
#include <stdint.h>extern uint32_t SystemCoreClock;
#endif/* Constants that describe the hardware and memory usage. */
#define configCPU_CLOCK_HZ (SystemCoreClock)
#define configTICK_RATE_HZ ((TickType_t)1000)
#define configTOTAL_HEAP_SIZE ((size_t)1024*40)
#define configMINIMAL_STACK_SIZE ((uint16_t)256)
#define configSUPPORT_DYNAMIC_ALLOCATION 1
#define configSUPPORT_STATIC_ALLOCATION 0/* Constants related to the behaviour or the scheduler. */
#define configMAX_PRIORITIES 5
#define configUSE_PREEMPTION 1
#define configUSE_TIME_SLICING 1
#define configIDLE_SHOULD_YIELD 0
#define configMAX_TASK_NAME_LEN (10)
#define configUSE_16_BIT_TICKS 0/* Software timer definitions. */
#define configUSE_TIMERS 1
#define configTIMER_TASK_PRIORITY 2
#define configTIMER_QUEUE_LENGTH 5
#define configTIMER_TASK_STACK_DEPTH (configMINIMAL_STACK_SIZE * 2)/* Constants that build features in or out. */
#define configUSE_MUTEXES 1
#define configUSE_RECURSIVE_MUTEXES 1
#define configUSE_COUNTING_SEMAPHORES 1
#define configUSE_QUEUE_SETS 1
#define configUSE_TASK_NOTIFICATIONS 1
#define configUSE_TRACE_FACILITY 1
#define configUSE_TICKLESS_IDLE 0
#define configUSE_APPLICATION_TASK_TAG 0
#define configUSE_NEWLIB_REENTRANT 0
#define configUSE_CO_ROUTINES 0/* Constants provided for debugging and optimisation assistance. */
#define configCHECK_FOR_STACK_OVERFLOW 0
#define configQUEUE_REGISTRY_SIZE 0
#define configASSERT( x ) if( ( x ) == 0 ) { taskDISABLE_INTERRUPTS(); for( ;; ); }/* Constants that define which hook (callback) functions should be used. */
#define configUSE_IDLE_HOOK 0
#define configUSE_TICK_HOOK 0
#define configUSE_DAEMON_TASK_STARTUP_HOOK 0
#define configUSE_MALLOC_FAILED_HOOK 0/* Port specific configuration. */
#define configENABLE_MPU 0
#define configENABLE_FPU 1
#define configENABLE_TRUSTZONE 1
#define configMINIMAL_SECURE_STACK_SIZE ((uint32_t)1024)
#define configRUN_FREERTOS_SECURE_ONLY 0/* Cortex-M specific definitions. */
#ifdef __NVIC_PRIO_BITS/* __NVIC_PRIO_BITS will be specified when CMSIS is being used. */#define configPRIO_BITS __NVIC_PRIO_BITS
#else/* 7 priority levels */#define configPRIO_BITS 4
#endif/* The lowest interrupt priority that can be used in a call to a "set priority" function. */
#define configLIBRARY_LOWEST_INTERRUPT_PRIORITY 0x0f/* The highest interrupt priority that can be used by any interrupt service* routine that makes calls to interrupt safe FreeRTOS API functions. DO NOT* CALL INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT THAT HAS A* HIGHER PRIORITY THAN THIS! (higher priorities are lower numeric values). */
#define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5/* Interrupt priorities used by the kernel port layer itself. These are generic* to all Cortex-M ports, and do not rely on any particular library functions. */
#define configKERNEL_INTERRUPT_PRIORITY (configLIBRARY_LOWEST_INTERRUPT_PRIORITY << (8 - configPRIO_BITS))/* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!* See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
#define configMAX_SYSCALL_INTERRUPT_PRIORITY (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS))/* Set the following definitions to 1 to include the API function, or zero* to exclude the API function. NOTE: Setting an INCLUDE_ parameter to 0 is* only necessary if the linker does not automatically remove functions that are* not referenced anyway. */
#define INCLUDE_vTaskPrioritySet 1
#define INCLUDE_uxTaskPriorityGet 1
#define INCLUDE_vTaskDelete 1
#define INCLUDE_vTaskSuspend 1
#define INCLUDE_vTaskDelayUntil 1
#define INCLUDE_vTaskDelay 1
#define INCLUDE_xTaskGetIdleTaskHandle 1
#define INCLUDE_xTaskAbortDelay 1
#define INCLUDE_xQueueGetMutexHolder 1
#define INCLUDE_xSemaphoreGetMutexHolder 1
#define INCLUDE_xTaskGetHandle 1
#define INCLUDE_uxTaskGetStackHighWaterMark 1
#define INCLUDE_uxTaskGetStackHighWaterMark2 1
#define INCLUDE_eTaskGetState 1
#define INCLUDE_xTaskResumeFromISR 1
#define INCLUDE_xTimerPendFunctionCall 1
#define INCLUDE_xTaskGetSchedulerState 1
#define INCLUDE_xTaskGetCurrentTaskHandle 1/* Map the FreeRTOS port interrupt handlers to their CMSIS standard names. */
#define xPortPendSVHandler PendSV_Handler
#define vPortSVCHandler SVC_Handler
#define xPortSysTickHandler SysTick_Handler#if (defined(__ARMCC_VERSION) || defined(__GNUC__) || defined(__ICCARM__))
/* Include debug event definitions */
#include "freertos_evr.h"
#endif#endif /* FREERTOS_CONFIG_H */
编写闪灯任务，验证移植结果
/*!* @brief 汇编延时** @param ulCount:延时时钟数** @return 无** @note ulCount每增加1，该函数增加6个时钟（M4是3个时钟）** @see */
#if defined (__CC_ARM) /*!< ARM Compiler */
__asm void userDelay(unsigned long ulCount)
{subs r0, #1;bne userDelay;bx lr;
}
#elif defined ( __ICCARM__ ) /*!< IAR Compiler */
void userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne.n userDelay\n"" bx lr");
}#elif defined (__GNUC__) /*!< GNU Compiler */
void __attribute__((naked)) userDelay(unsigned long ulCount)
{__asm(" subs r0, #1\n"" bne userDelay\n"" bx lr");
}#elif defined (__TASKING__) /*!< TASKING Compiler */
/*?*/
#endif /* __CC_ARM */
#include "FreeRTOS.h"
#include "task.h"
uint32_t HAL_GetTick (void)
{static uint32_t ticks = 0U;if (xTaskGetSchedulerState() == taskSCHEDULER_RUNNING){return ((uint32_t)xTaskGetTickCount());}/* 如果OS还没有运行，采用下面方式 */userDelay((SystemCoreClock/6000));return ++ticks;
}HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority)
{return HAL_OK;
}void vTaskLED(void * pvParameters)
{while(1){vTaskDelay(100);HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);}
}
static TaskHandle_t ledTaskHandle;
/*** @brief The application entry point.* @retval int*/
int main(void)
{/* 关闭中断 防止初始化过程中进入中断 因为中断服务函数中可能使用freertos API 而此时freertos还未启动 freertos启动时会自动开启中断*/taskDISABLE_INTERRUPTS();HAL_Init();SystemClock_Config();MX_GPIO_Init();BaseType_t pd = xTaskCreate(vTaskLED, "TaskLED", 128, 0, 1, &ledTaskHandle);if(pd != pdPASS){//创建任务失败}vTaskStartScheduler();while (1){}/* USER CODE END 3 */
}
CPU利用率
使用中间件的情况下，出来上面使用高精度定时器的方法来统计CPU利用率外，还有一种更为简单的方法
使用keil的Event Recorder中间件可以十分简单的观察RTOS运行时的状态, Event Recorder中间件使用可以参考博客 https://blog.csdn.net/weixin_42378319/article/details/110131289?spm=1001.2014.3001.5501
- 勾选 Event Recorder中间件
- 初始化Event Recorder中间件
细心的童鞋可能会发现，使用MDK中间件创建的FreeRTOS工程多了一个文件，这个文件是官方专为FreeRTOS调试编写的
3. 调出FreeRTOS RTOS窗口和System Analyzer窗口，查看RTOS运行状态
本质上还是利用Event Recorder中间件，启用Event Recorder中间件后，FreeRTOS代码会通过宏定义开启一些函数，例如任务在创建时，会通过Event Recorder中间件在RAM中缓存固定格式数据，MDK读取固定格式数据，转换到窗体上显示出来
System Analyzer窗口有点小问题，不能显示任务名称，只显示了任务的地址信息，可以两个窗口结合着看
使用中间件缺点是需要安装对应中间件，不方便更换电脑，但是也可以根据文件目录，将对应中间件文件复制添加到工程中，从而不适用中间件
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