ucos+lwip应用心得[社区]

nbsp;}
    }

  }
}

u32_t  sys_arch_mbox_fetch(sys_mbox_t mbox, void **data, u32_t timeout)
{
    u32_t     ucErr;
    u16_t ucos_timeout;
  //在 lwip中 ,timeout的单位是ms  
  // 在ucosII ,timeout 的单位是timer tick
   ucos_timeout = 0;
  if(timeout != 0){
  ucos_timeout = (timeout )*( OS_TICKS_PER_SEC/1000);
  if(ucos_timeout < 1)
      ucos_timeout = 1;
  else if(ucos_timeout > 65535)
      ucos_timeout = 65535;
  }   &nbs

p;    
  //如果data!=NULL就返回消息指针,
  if(data != NULL){
    *data = OSQPend( mbox->pQ, (u16_t)ucos_timeout, &ucErr );        
  }else{
    OSQPend(mbox->pQ,(u16_t)ucos_timeout,&ucErr);
  }
//这里修改了ucos中的OSQPend系统调用,
//原来的void  *OSQPend (OS_EVENT *pevent, INT16U timeout, INT8U *err)
// err的返回值只有两种:收到消息就返回OS_NO_ERR,超时则返回OS_TIMEOUT
//这里先将err从8位数据改变成了16位数据 OSQPend(*pevent,timeout, INT16U *err)
//重新定义了OS_TIMEOUT
//在ucos中原有#define OS_TIMEOUT 20
//改为 #define  OS_TIMEOUT  -1
//err返回值的意义也改变了,如果超时返回OS_TIMEOUT
// 如果收到消息,则返回OSTCBCur->OSTCBDly修改部分代码如下
//if (msg != (void *)0) { /* Did we get a message?  */
// OSTCBCur->OSTCBMsg = (void *)0;
// OSTCBCur->OSTCBStat     = OS_STAT_RDY;
// OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0;
// *err = OSTCBCur->OSTCBDly;// zhangzs @2003.12.12
//    OS_EXIT_CRITICAL();
// return (msg);     /* Return message received */
//    }
//关于ucos的OSTBCur->OSTCBDly的含义请查阅ucos的书籍
  if( ucErr == OS_TIMEOUT ) {
       timeout = SYS_ARCH_TIMEOUT;
    } else {
      if(*data == (void*)&pvNullPointer )
      *data = NULL;
      //单位转换,从ucos tick->ms
      timeout = (ucos_timeout -ucErr)*(1000/ OS_TICK

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