在《按键控制蜂鸣器鸣笛》的程序基础上，将功能导入到FreeRTOS系统上跑，实现检测扩展板上的KEY1状态，控制蜂鸣器鸣笛。按一下按键，蜂鸣器滴滴滴响（每200毫秒响一次），再按一次按键，蜂鸣器关闭。
配置FreeRTOS信息
1.从BEEP的项目里导入ioc文件，并命名为FreeRTOS。
2.点击Middleware->FREERTOS，选择CMSIS_V1，点击Tasks and Queues，这里默认这里会有一个任务，再新建两个任务，其中一个管理蜂鸣器，另一个管理按键。
3.蜂鸣器任务信息如下图所示：
Task Name：任务名称。
Priority:设置优先级。
Stack Size:堆空间，可根据实际修改大小。
Entry Function:任务函数实体。
Code Generation Option:代码生成配置，默认是weak生成任务实体，可选择external不生成任务实体。
Parameter:任务参数。
Allocation:可选择Dynamic动态分配或者Static静态分配。
Buffer Name:静态分配的buff名称。
Control Block Name:静态分配的块名称。
按键任务也是一样，只是名称不同而已。
核心代码解释
1.在BSP中新建蜂鸣器的驱动库bsp_task.h和bsp_task.c文件。在bsp_task.h中增加以下内容：
/** bsp_task.h** Created on: Mar 5, 2022* Author: Administrator*/#ifndef BSP_TASK_H_
#define BSP_TASK_H_void Task_Entity_LED(void);
void Task_Entity_Beep(void);
void Task_Entity_Key(void);#endif /* BSP_TASK_H_ */
其中Task_Entity_LED()函数管理LED灯，Task_Entity_Beep()管理蜂鸣器，Task_Entity_Key()管理按键。
/** bsp_task.c** Created on: Mar 5, 2022* Author: Administrator*/
#include "bsp.h"int enable_beep = 0;// LED light task entity function LED灯任务实体函数
void Task_Entity_LED(void)
{while (1){// The indicator lights up every 100 milliseconds 指示灯每隔100毫秒亮一次LED_TOGGLE();osDelay(100);}
}// Buzzer task entity function 蜂鸣器任务实体函数
void Task_Entity_Beep(void)
{while (1){if (enable_beep){// The buzzer goes off every 200 milliseconds 蜂鸣器每200毫秒响一次BEEP_ON();osDelay(100);BEEP_OFF();osDelay(100);}else{BEEP_OFF();osDelay(100);}}
}// Key task entity function 按键任务实体函数
void Task_Entity_Key(void)
{while (1){if (Key1_State(1) == KEY_PRESS){// Button controls the buzzer switch 按键控制蜂鸣器开关enable_beep = !enable_beep;}osDelay(10);}
}
2.在freertos.c文件中引入bsp.h，找到对应的三个任务的实体函数，并且分别调用我们手动建立的任务函数。
/* USER CODE BEGIN Header */
/********************************************************************************* File Name : freertos.c* Description : Code for freertos applications******************************************************************************* @attention** Copyright (c) 2022 STMicroelectronics.* All rights reserved.** This software is licensed under terms that can be found in the LICENSE file* in the root directory of this software component.* If no LICENSE file comes with this software, it is provided AS-IS.********************************************************************************/
/* USER CODE END Header *//* Includes ------------------------------------------------------------------*/
#include "FreeRTOS.h"
#include "task.h"
#include "main.h"
#include "cmsis_os.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "bsp.h"
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD *//* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD *//* USER CODE END PD *//* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM *//* USER CODE END PM *//* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN Variables */
osThreadId beepTaskHandle;
/* USER CODE END Variables */
osThreadId defaultTaskHandle;
osThreadId myTask_BEEPHandle;
osThreadId myTask_KEYHandle;/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN FunctionPrototypes *//* USER CODE END FunctionPrototypes */void StartDefaultTask(void const * argument);
void StartTask_BEEP(void const * argument);
void StartTask_KEY(void const * argument);void MX_FREERTOS_Init(void); /* (MISRA C 2004 rule 8.1) *//* GetIdleTaskMemory prototype (linked to static allocation support) */
void vApplicationGetIdleTaskMemory( StaticTask_t **ppxIdleTaskTCBBuffer, StackType_t **ppxIdleTaskStackBuffer, uint32_t *pulIdleTaskStackSize );/* USER CODE BEGIN GET_IDLE_TASK_MEMORY */
static StaticTask_t xIdleTaskTCBBuffer;
static StackType_t xIdleStack[configMINIMAL_STACK_SIZE];void vApplicationGetIdleTaskMemory( StaticTask_t **ppxIdleTaskTCBBuffer, StackType_t **ppxIdleTaskStackBuffer, uint32_t *pulIdleTaskStackSize )
{*ppxIdleTaskTCBBuffer = &xIdleTaskTCBBuffer;*ppxIdleTaskStackBuffer = &xIdleStack[0];*pulIdleTaskStackSize = configMINIMAL_STACK_SIZE;/* place for user code */
}
/* USER CODE END GET_IDLE_TASK_MEMORY *//*** @brief FreeRTOS initialization* @param None* @retval None*/
void MX_FREERTOS_Init(void) {/* USER CODE BEGIN Init *//* USER CODE END Init *//* USER CODE BEGIN RTOS_MUTEX *//* add mutexes, ... *//* USER CODE END RTOS_MUTEX *//* USER CODE BEGIN RTOS_SEMAPHORES *//* add semaphores, ... *//* USER CODE END RTOS_SEMAPHORES *//* USER CODE BEGIN RTOS_TIMERS *//* start timers, add new ones, ... *//* USER CODE END RTOS_TIMERS *//* USER CODE BEGIN RTOS_QUEUES *//* add queues, ... *//* USER CODE END RTOS_QUEUES *//* Create the thread(s) *//* definition and creation of defaultTask */osThreadDef(defaultTask, StartDefaultTask, osPriorityNormal, 0, 128);defaultTaskHandle = osThreadCreate(osThread(defaultTask), NULL);/* definition and creation of myTask_BEEP */osThreadDef(myTask_BEEP, StartTask_BEEP, osPriorityIdle, 0, 128);myTask_BEEPHandle = osThreadCreate(osThread(myTask_BEEP), NULL);/* definition and creation of myTask_KEY */osThreadDef(myTask_KEY, StartTask_KEY, osPriorityIdle, 0, 128);myTask_KEYHandle = osThreadCreate(osThread(myTask_KEY), NULL);/* USER CODE BEGIN RTOS_THREADS *//* add threads, ... *//* USER CODE END RTOS_THREADS */}/* USER CODE BEGIN Header_StartDefaultTask */
/*** @brief Function implementing the defaultTask thread.* @param argument: Not used* @retval None*/
/* USER CODE END Header_StartDefaultTask */
void StartDefaultTask(void const * argument)
{/* USER CODE BEGIN StartDefaultTask *//* Infinite loop */// for(;;)// {// osDelay(1);// }Task_Entity_LED();/* USER CODE END StartDefaultTask */
}/* USER CODE BEGIN Header_StartTask_BEEP */
/**
* @brief Function implementing the myTask_BEEP thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_StartTask_BEEP */
void StartTask_BEEP(void const * argument)
{/* USER CODE BEGIN StartTask_BEEP *//* Infinite loop */// for(;;)// {// osDelay(1);// }Task_Entity_Beep();/* USER CODE END StartTask_BEEP */
}/* USER CODE BEGIN Header_StartTask_KEY */
/**
* @brief Function implementing the myTask_KEY thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_StartTask_KEY */
void StartTask_KEY(void const * argument)
{/* USER CODE BEGIN StartTask_KEY *//* Infinite loop */// for(;;)// {// osDelay(1);// }Task_Entity_Key();/* USER CODE END StartTask_KEY */
}/* Private application code --------------------------------------------------*/
/* USER CODE BEGIN Application *//* USER CODE END Application */烧录程序后，LED灯每隔200毫秒闪一次，按一下按键，蜂鸣器滴滴滴响（每200毫秒响一次），再按一次按键，蜂鸣器关闭。