21_消息队列

消息队列

消息队列

1、任务级队列处理函数

2、中断级队列处理函数(带中断保护)已经在CMSIS接口中封装

但写入生产速度比消费速度快的时候,容易出现数据被覆盖

邮箱队列

创建、发送、接收、查询、删除

传数值

osEvent event = osMessageGet(myQueue01Handle, osWaitForever);
if(event.status == osEventMessage)
{
	printf("data = %d\n", event.value.v);
}

osMessagePut(myQueue01Handle, 10, 0);

传结构体对象

typedef struct
{
	uint8_t name;
	uint8_t id;
	uint8_t age;
}T_Data;

T_Data m_Data;
m_Data.age = 10;
m_Data.id = 2;
m_Data.name = 1;
osMessagePut(myQueue01Handle, (uint32_t)&m_Data, 0);

osEvent event = osMessageGet(myQueue01Handle, osWaitForever);
if(event.status == osEventMessage)
{
	T_Data *pData = (T_Data *)event.value.p;
	printf("age = %d\n", pData->age);
	printf("name = %d\n", pData->name);
	printf("id = %d\n", pData->id);
}

邮箱队列

如果put比get快时会出现结构体数据被篡改的问题,这时就需要邮箱队列

osMailQId mailQ01Handle;
osMailQDef(mailQ01, 15, T_Data);
mailQ01Handle = osMailCreate(osMailQ(mailQ01), NULL);

osEvent event = osMailGet(mailQ01Handle, osWaitForever);
if(event.status == osEventMail)
{
	T_Data *m_Data = (T_Data *)event.value.p;
	printf("age = %d\n", m_Data->age);
	printf("name = %d\n", m_Data->name);
	printf("id = %d\n", m_Data->id);
}

T_Data m_Data;
m_Data.age = 10;
m_Data.id = 2;
m_Data.name = 1;
printf("Task2 start\n");
osMailPut(mailQ01Handle, &m_Data);

结论: 邮箱队列适合整体大数据, 消息队列适合状态小数据