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Full Discussion: Serial port programming
Top Forums Programming Serial port programming Post 302226393 by raj8109 on Tuesday 19th of August 2008 01:18:51 AM
Old 08-19-2008
Serial port programming

I am developing an application in c with Linux OS, where a radio modem working at baud rate 9600 will be attached to PC on serial port. More than four such units will be communicating at one time, so there may be jamming or data corruption. Each module will be transmitting Data packets less than 500 bytes.
How should I set my serial port and program my application so that I can receive packets correctly.
Your suggestions will be welcomed
 

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DIO_TCSETATTR(3)							 1							  DIO_TCSETATTR(3)

dio_tcsetattr - Sets terminal attributes and baud rate for a serial port

SYNOPSIS
bool dio_tcsetattr (resource $fd, array $options) DESCRIPTION
dio_tcsetattr(3) sets the terminal attributes and baud rate of the open $fd. PARAMETERS
o $fd - The file descriptor returned by dio_open(3). o $options - The currently available options are: o 'baud' - baud rate of the port - can be 38400,19200,9600,4800,2400,1800, 1200,600,300,200,150,134,110,75 or 50, default value is 9600. o 'bits' - data bits - can be 8,7,6 or 5. Default value is 8. o 'stop' - stop bits - can be 1 or 2. Default value is 1. o 'parity' - can be 0,1 or 2. Default value is 0. RETURN VALUES
No value is returned. EXAMPLES
Example #1 Setting the baud rate on a serial port <?php $fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK); dio_fcntl($fd, F_SETFL, O_SYNC); dio_tcsetattr($fd, array( 'baud' => 9600, 'bits' => 8, 'stop' => 1, 'parity' => 0 )); while (1) { $data = dio_read($fd, 256); if ($data) { echo $data; } } ?> NOTES
Note This function is not implemented on Windows platforms. PHP Documentation Group DIO_TCSETATTR(3)
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