[嵌入式]STM32G0学习手册——FreeRTOS信号量

目录

二值信号量的用法示例

二值信号量的用法示例

1.创建好带有printf-stdarg.c的FreeRTOS的工程

2.修改main.c文件

/* USER CODE BEGIN Includes */

#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"
#include <stdio.h>
#include <string.h>

/* USER CODE END Includes */
/* USER CODE BEGIN PV */

static TaskHandle_t AppTaskCreate_Handle = NULL;
static TaskHandle_t KeyTask_Handle = NULL;
static TaskHandle_t Led1Task_Handle = NULL;

/*Create a binary semaphore handle*/
static SemaphoreHandle_t Binary_Handle = NULL;

extern int f_printf(const char *format, ...);

/* USER CODE END PV */
/* USER CODE BEGIN PFP */

/*Create a task function*/
static void AppTaskCreate(void);
static void KeyTaskCreate(void);
static void Led1TaskCreate(void);

/* USER CODE END PFP */

int main()
{
  /*
  *
  */
  /* USER CODE BEGIN WHILE */
  UBaseType_t xReturn = pdPASS;
	
	xReturn = xTaskCreate((TaskFunction_t)AppTaskCreate,
	                      (const char *) "APPTASKCREATE",
						  (uint16_t)     128,
						  (void *)       NULL,
						  (UBaseType_t)  2,
						  (TaskHandle_t *)&AppTaskCreate_Handle);
  if(xReturn ==pdPASS)
	{
		vTaskStartScheduler();
		f_printf("start..\r\n");
	}
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */


}


/* USER CODE BEGIN 4 */
static void AppTaskCreate(void)
{
  UBaseType_t xReturn = pdPASS;
  

  xReturn = xTaskCreate((TaskFunction_t) KeyTaskCreate,
	                     (const char *)   "KEYTASKCREATE",
						 (uint16_t)       128,
						 (void *)         NULL,
						 (UBaseType_t )   2,
						 (TaskHandle_t *) &KeyTask_Handle);

  xReturn = xTaskCreate((TaskFunction_t) Led1TaskCreate,
						(const char *)   "LED1TASKCREATE",
						(uint16_t)       128,
						(void *)         NULL,
						(UBaseType_t)    1,
						(TaskHandle_t *)&Led1Task_Handle);
	
    /*Create a binary semaphore*/
	Binary_Handle = xSemaphoreCreateBinary();
	if(Binary_Handle !=NULL)
		f_printf("Create Semph_Binary PASS.\r\n");
	
	if(xReturn == pdPASS)
    vTaskDelete((TaskHandle_t)AppTaskCreate_Handle);		
}

static void KeyTaskCreate(void)
{
  while(1)
	{
		UBaseType_t xReturn = pdPASS;
		if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0))
		{
			f_printf("KEY TASK PASS.\r\n");
			vTaskDelay(100);
			if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0))
			{
				xReturn = xSemaphoreGive(Binary_Handle);
				if(xReturn == pdPASS)
					f_printf("GIVE BINARY PASS.\r\n");
				else if(xReturn == errQUEUE_FULL)
					f_printf("QUEUE IS FULL.\r\n");
			}
		}
		
    vTaskDelay(100);
	}

}
static void Led1TaskCreate(void)
{
  while(1)
	{
		UBaseType_t xReturn = pdPASS;
		
		xReturn = xSemaphoreTake(Binary_Handle, portMAX_DELAY);
		if(xReturn == pdPASS)
		{
			f_printf("TAKE BINARY PASS.\r\n");
			HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_2);
		}
		
	  vTaskDelay(100);
	}
}

/* USER CODE END 4 */