10-29-2014
Quote:
Originally Posted by
Meow613
What is absolutely confusing to me is that I had a C program and a PHP script that ran perfectly from both the command line and a as a script, then suddenly stopped running.
I bet the terminal settings on /dev/ttyS0 changed. They are global... If you change it, it stays changed until something else changes it (or the computer reboots). Terminal settings can do a
lot, not just baud rate but things like "should I force you to wait until there's an entire line?", "how many seconds until I give up, or wait forever?" and "should I strip out or translate carriage returns, or give them to you raw?"
That's probably why it works in minicom and not your shell, too. minicom knows how to set up the terminal. And why I want the printout from
stty -g -F /dev/ttyS0 while minicom is running -- if we can get its "working" settings maybe we can steal them.
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LEARN ABOUT PHP
dio_tcsetattr
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)