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Old 03-17-2004, 10:00 PM   #1
skguha
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Registered: Mar 2004
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Using serial port with external device


Hi,

I am new to linux and was just wondering how one can see the status of the serial ports....as in i have to write a program to send and receive data thru the serial port.....but i dunno what the address of my serial port is (ttyS0-ttyS29)....there r a lot of ttyS* in my /dev directory....

i just wanted to check how to assign

ttyfd = open("/dev/ttyS_",O_RDWR);

in the program, i am using the above line to open the serial port but i need to know which number it is say 0 or 1 etc.....

Any help will be greatly appreciated .....

Thanks a lot...
 
Old 03-18-2004, 11:13 AM   #2
aaa
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Registered: Jul 2003
Location: VA
Distribution: Slack 10.1
Posts: 2,194

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COM1=/dev/ttyS0
COM2=/dev/ttyS1 ... etc
Try:
ttyfd = open("/dev/ttyS0",O_RDWR | O_NOCTTY);
For more info:
See the Serial-Programming-HOWTO @ www.tldp.org
And this:
http://www.easysw.com/~mike/serial/
 
Old 03-18-2004, 09:26 PM   #3
skguha
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Registered: Mar 2004
Posts: 21

Original Poster
Rep: Reputation: 15
Thanks a lot for the reply....
the link was really helpful....

helped solve another probem about flags as well...


Thanks again...
 
  


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