μC/OSIII——任务同步和通信（一）

μC/OSIII——任务同步和通信（一）

分类： μC/OSIII 2014-10-15 17:01 31人阅读 评论(0) 收藏 举报

c os 实例

使用情况

任务间通常涉及发送和接收，但是发送速度和接收速度要匹配，不然就出问题了，为了解决这个问题在通信的同时加上流量控制（同步）

使用方法

用一个信号量和消息队列，模型如下：

通信发送：

等待接收完成信号；

发送消息；

通信接收：

等待发送消息；

发送接收完成信号；

使用实例

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#define APP_TASK_START_PRIO 4u #define APP_TASK_1_PRIO 6u #define APP_TASK_2_PRIO 5u #define APP_TASK_START_STK_SIZE 256u #define APP_TASK_1_STK_SIZE 256u #define APP_TASK_2_STK_SIZE 256u static OS_TCB AppTaskStartTCB; static OS_TCB AppTask1TCB; static OS_TCB AppTask2TCB; static OS_Q MY_Q; static OS_SEM MY_SEM; static CPU_STK AppTaskStartStk[APP_TASK_START_STK_SIZE]; static CPU_STK AppTask1Stk[APP_TASK_1_STK_SIZE]; static CPU_STK AppTask2Stk[APP_TASK_2_STK_SIZE]; static void AppTaskStart(void *p_arg); void AppTask1(void *p_arg); void AppTask2(void *p_arg); void *BLOCK1 = "Task1 is comunicating with Task2"; void *BLOCK2; int main (void) { OS_ERR err; OSInit(&err); OSQCreate((OS_Q *)&MY_Q, (CPU_CHAR *)"MY_Q", (OS_MSG_QTY)10, (OS_ERR *)&err); OSSemCreate((OS_SEM *)&MY_SEM, (CPU_CHAR *)"MY_SEM", (OS_SEM_CTR )1, //信号量初始值为1 (OS_ERR *)&err); OSTaskCreate((OS_TCB *)&AppTaskStartTCB, (CPU_CHAR *)"App Task Start", (OS_TASK_PTR ) AppTaskStart, (void *) 0, (OS_PRIO ) APP_TASK_START_PRIO, (CPU_STK *)&AppTaskStartStk[0], (CPU_STK_SIZE) APP_TASK_START_STK_SIZE / 10u, (CPU_STK_SIZE) APP_TASK_START_STK_SIZE, (OS_MSG_QTY ) 0u, (OS_TICK ) 0u, (void *) 0, (OS_OPT )(OS_OPT_TASK_STK_CHK | OS_OPT_TASK_STK_CLR), (OS_ERR *)&err); OSStart(&err); } static void AppTaskStart (void *p_arg) { OS_ERR err; (void)p_arg; CPU_Init(); OSTaskCreate((OS_TCB *)&AppTask1TCB, (CPU_CHAR *)"AppTask1", (OS_TASK_PTR)AppTask1, (void *)0, (OS_PRIO)APP_TASK_1_PRIO, (CPU_STK *)&AppTask1Stk[0], (CPU_STK_SIZE)APP_TASK_1_STK_SIZE / 10u, (CPU_STK_SIZE)APP_TASK_1_STK_SIZE, (OS_MSG_QTY)0u, (OS_TICK)0u, (void *)0, (OS_OPT)(OS_OPT_TASK_STK_CHK | OS_OPT_TASK_STK_CLR), (OS_ERR *)&err); OSTaskCreate((OS_TCB *)&AppTask2TCB, (CPU_CHAR *)"AppTask2", (OS_TASK_PTR)AppTask2, (void *)0, (OS_PRIO)APP_TASK_2_PRIO, (CPU_STK *)&AppTask2Stk[0], (CPU_STK_SIZE)APP_TASK_2_STK_SIZE / 10u, (CPU_STK_SIZE)APP_TASK_2_STK_SIZE, (OS_MSG_QTY)0u, (OS_TICK)0u, (void *)0, (OS_OPT)(OS_OPT_TASK_STK_CHK | OS_OPT_TASK_STK_CLR), (OS_ERR *)&err); } void AppTask1(void *p_arg) { OS_ERR err; CPU_TS ts; (void)p_arg; while (DEF_ON){ OSSemPend((OS_SEM *)&MY_SEM, (OS_TICK )0, (OS_OPT )OS_OPT_PEND_BLOCKING, (CPU_TS *)&ts, (OS_ERR *)&err); APP_TRACE_DBG(("Task1 is running...\n\r")); OSQPost((OS_Q *)&MY_Q, (void *)BLOCK1, (OS_MSG_SIZE)sizeof(BLOCK1), (OS_OPT )OS_OPT_POST_FIFO, (OS_ERR *)&err); OSTimeDlyHMSM(0, 0, 1, 0, OS_OPT_TIME_DLY, &err); } } void AppTask2(void *p_arg) { OS_ERR err; OS_MSG_SIZE size; CPU_TS ts; (void)p_arg; while (DEF_ON){ BLOCK2=OSQPend((OS_Q *)&MY_Q, (OS_TICK )0, (OS_OPT )OS_OPT_PEND_BLOCKING, (OS_MSG_SIZE*)&size, (CPU_TS )&ts, (OS_ERR *)&err); APP_TRACE_DBG(("Task2 is running...\n\r")); APP_TRACE_DBG(("%s...\n\r",BLOCK2)); OSSemPost((OS_SEM *)&MY_SEM, (OS_OPT )OS_OPT_POST_1, (OS_ERR *)&err); OSTimeDlyHMSM(0, 0, 1, 0, OS_OPT_TIME_DLY, &err); } }

来自CODE的代码片

SEM-AND-Q

实验结果

信号量初始值为1

信号量初始值为0

锁死状态