一、任务间通信
1、完成量
概述
完成量是一种简单的任务间通信机制，用以在任务间同步某一事件是否已“完成”的信息。
API讲解
编程实例
1、在tos_config.h中，配置完成量组件开关TOS_CFG_COMPLETION_EN：
#define TOS_CFG_COMPLETION_EN 1u
2、编写main.c示例代码：
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "cmsis_os.h"
#include "stdio.h"
#include "tos_k.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/*
这个例子里创建了两个任务，一个任务task_wait等待完成量完成，另一个任务负责触发完成量（让完成量完成）
*/
#define STK_SIZE_TASK_WAIT 512
#define STK_SIZE_TASK_TRIGGER 512
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
k_stack_t stack_task_wait[STK_SIZE_TASK_WAIT];
k_stack_t stack_task_trigger[STK_SIZE_TASK_TRIGGER];
k_task_t task_wait;
k_task_t task_trigger;
k_completion_t completion;
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
void entry_task_wait(void *arg)
{
printf("wait: I won't go further until someone do the trigger(make it 'complete')\n");
tos_completion_pend(&completion);
printf("wait: someone has made it complete, so I'm here\n");
}
void entry_task_trigger(void *arg)
{
printf("trigger: I'm the one who make complete, anyone waitting for the complete won't go further until I do the trigger\n");
tos_completion_post(&completion);
printf("trigger: I have done the completion\n");
}
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
tos_knl_init();
tos_completion_create(&completion);
(void)tos_task_create(&task_wait, "wait", entry_task_wait, NULL,
3, stack_task_wait, STK_SIZE_TASK_WAIT, 0);
(void)tos_task_create(&task_trigger, "trigger", entry_task_trigger, NULL,
4, stack_task_trigger, STK_SIZE_TASK_TRIGGER, 0);
tos_knl_start();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}3、运行效果：
源码链接
