WILLIAM J LUTTER wrote: > SUMMARY I'm running SL 5.0 (Boron) with kernel 2.6.18-92.1.22.el5. I have a > 15 year old digitizer unit with vanilla 8N1 (8 bits, no parity, one stop bit) > serial port parameters. > > When I send the unit a status prompt which returns 55 characters, it comes > back using a c "read(fd,data,80) (read in up to 80 bytes) as 8 bytes per read > - as if there is an 8 byte buffer associated with the 16550A UART serial > port.
the 16550 uart has a 16 byte fifo buffer. if you are using a 'canned' i/o to read/write the 16550, that could be causing your problems. i would suggest that you pull http://www.national.com/ds/PC/PC16550D.pdf and read so that you can write your own i/o to get interface that you want. hth. -- peace out. tc,hago. g . **** in a free world without fences, who needs gates. ** help microsoft stamp out piracy - give linux to a friend today. ** to mess up a linux box, you need to work at it. to mess up an ms windows box, you just need to *look* at it. ** learn linux: 'Rute User's Tutorial and Exposition' http://rute.2038bug.com/index.html 'The Linux Documentation Project' http://www.tldp.org/ 'LDP HOWTO-index' http://www.tldp.org/HOWTO/HOWTO-INDEX/index.html 'HowtoForge' http://howtoforge.com/ ****
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