📄 21ic ucos+lwip应用心得[社区].htm
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(h != NULL)
{<BR> h(arg);<BR> }<BR> //因为定时事件中的定时时间到或者是因为sys_arch_mbo_fetch超时到而执行到<BR>//这里,返回本函数开头重新等待mbox的消息<BR> goto
again;<BR> } else
{<BR> //如果sys_arch_mbox_fetch无超时收到消息返回<BR>//则刷新定时事件链表中定时事件的time值.<BR> if
(time <= timeouts->next->time)
{<BR> timeouts->next->time -=
time;<BR> } else
{<BR> timeouts->next->time =
0;<BR> }<BR> }<BR><BR> }<BR>}<BR><BR>u32_t sys_arch_mbox_fetch(sys_mbox_t
mbox, void **data, u32_t
timeout)<BR>{<BR> u32_t ucErr;<BR> u16_t
ucos_timeout;<BR> //在 lwip中
,timeout的单位是ms <BR> // 在ucosII ,timeout
的单位是timer tick <BR> ucos_timeout =
0;<BR> if(timeout != 0){<BR> ucos_timeout =
(timeout )*( OS_TICKS_PER_SEC/1000);<BR> if(ucos_timeout
< 1)<BR> ucos_timeout =
1;<BR> else if(ucos_timeout >
65535)<BR> ucos_timeout =
65535;<BR> } <BR> //如果data!=NULL就返回消息指针,<BR> if(data
!= NULL){<BR> *data = OSQPend( mbox->pQ,
(u16_t)ucos_timeout, &ucErr
); <BR> }else{<BR> OSQPend(mbox->pQ,(u16_t)ucos_timeout,&ucErr);<BR> }<BR>//这里修改了ucos中的OSQPend系统调用,
<BR>//原来的void *OSQPend (OS_EVENT *pevent, INT16U timeout,
INT8U *err)<BR>//
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<BR>//这里先将err从8位数据改变成了16位数据
OSQPend(*pevent,timeout, INT16U
*err)<BR>//重新定义了OS_TIMEOUT<BR>//在ucos中原有#define OS_TIMEOUT
20<BR>//改为
#define OS_TIMEOUT -1<BR>//err返回值的意义也改变了,如果超时返回OS_TIMEOUT<BR>//
如果收到消息,则返回OSTCBCur->OSTCBDly修改部分代码如下<BR>//if (msg != (void *)0) {
/* Did we get a message? */<BR>// OSTCBCur->OSTCBMsg =
(void *)0;<BR>//
OSTCBCur->OSTCBStat =
OS_STAT_RDY;<BR>// OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0;<BR>//
*err = OSTCBCur->OSTCBDly;// zhangzs
@2003.12.12<BR>// OS_EXIT_CRITICAL();<BR>//
return (msg); /* Return message
received
*/<BR>// }<BR>//关于ucos的OSTBCur->OSTCBDly的含义请查阅ucos的书籍<BR> if(
ucErr == OS_TIMEOUT )
{<BR> timeout =
SYS_ARCH_TIMEOUT;<BR> } else
{<BR> if(*data ==
(void*)&pvNullPointer )
<BR> *data =
NULL;<BR> //单位转换,从ucos
tick->ms<BR> timeout =
(ucos_timeout -ucErr)*(1000/
OS_TICKS_PER_SEC);<BR> }<BR> return
timeout;<BR>}<BR>semaphone的实现和mbox类似,这里就不再重复了.<BR> </P>
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