tty layer - exercise.htm

来自「LINUX内核编程的一些程序例子」· HTM 代码 · 共 51 行

HTM

51 行

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0063)http://www.geocities.com/marco_corvi/games/lkpe/tty/mem_tty.htm -->
<HTML><HEAD><TITLE>The TTY layer</TITLE>
<META http-equiv=Content-Type content="text/html; charset=windows-1252"><LINK 
href="tty layer - Exercise_file/style.css" rel=stylesheet>
<META content="MSHTML 6.00.2800.1170" name=GENERATOR></HEAD>
<BODY>
<H2>tty layer - Exercise </H2>
<DIV>The point of this exercise is to write a memory-based tty_driver. The 
hardware output should be provided by a memory buffer. Therefore the driver 
write() function that sends the user data on the output port should copy the 
data on this buffer. A timer can be used to emulate a delay in the transmission 
of the data. In a real situation there would be an interrupt raised by the 
hardware when data arrive, and the timer tasklet would push the data to the line 
disipline, so that they can be delivered to the user read() function. </DIV>
<DIV>[more description of the example] </DIV>
<DIV>You can now experiment changing the device settings and observing how 
changes the call to the read/write functions. For example, by turning ECHO on, 
the line discipline will echo all the characters from the flip buffer to the 
write() function. </DIV><BR clear=all><BR clear=all>
<DIV>Code:<BR><A 
href="http://www.geocities.com/marco_corvi/games/lkpe/tty/mem_tty.c">mem_tty.c</A>, 
memeory-based tty driver;<BR><A 
href="http://www.geocities.com/marco_corvi/games/lkpe/tty/mem_read.c">mem_read.c</A>, 
tty driver read test;<BR><A 
href="http://www.geocities.com/marco_corvi/games/lkpe/tty/mem_write.c">mem_write.c</A>, 
tty driver write test;<BR><A 
href="http://www.geocities.com/marco_corvi/games/lkpe/tty/Makefile.txt">Makefile</A>, 
tty driver write test;<BR></DIV><BR clear=all><FONT size=-1>Marco Corvi - 
2003</FONT> 
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