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lxd
MAME Fan
Reged: 02/27/14
Posts: 25
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Re: How to send serial for once 2 bytes to CPU i8051?
04/17/14 05:45 PM
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I have done it.
Sorry for my English level. It's complex, so I have to use Chinese.

依据8031的CPU手册，发送串口数据给CPU的时候，CPU需要一位一位的收取，如果上一位还没收取完成，就送下一位，肯定会覆盖掉前一位的数据。另外，如果CPU处于中断状态，串口中断优先级最低，也会造成数据丢失。

解决办法是：
1，在8031的ROM里将串口中断优先级提高，不要轻易 CLR EA
2，在游戏驱动里，将连续发送的的字符先存入队列，例如
#include <queue>
std::queue<int> m_fifo; //串口缓冲
然后等上一个数据发送完成，并且CPU回调的时候，再发送下一个数据。






Entire thread
Subject Posted by Posted on
* How to send serial for once 2 bytes to CPU i8051? lxd 04/16/14 07:39 PM
. * Re: How to send serial for once 2 bytes to CPU i8051? lxd  04/17/14 05:45 PM
. * Re: How to send serial for once 2 bytes to CPU i8051? Roberto Fresca  04/19/14 03:45 AM
. * Re: How to send serial for once 2 bytes to CPU i8051? lxd  04/20/14 06:57 AM
. * Re: How to send serial for once 2 bytes to CPU i8051? lxd  04/20/14 06:58 AM
. * Re: How to send serial for once 2 bytes to CPU i8051? StilettoAdministrator  04/19/14 04:59 AM

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