I'm using PHP to interface my AVR microcontroller in /dev/ttyS0. I bet someone else does the same.
Here's some hint :
- dio_tcsetattr -> is set to enable :
- RTS / CTS hardware control
- ICANON mode
(means that dio_read will wait until 0x0A/LF or other control character is entered in /dev/ttyS0 before it returns reading result, when you use dio_write it will also send 0x0A/LF automatically in the end of the message to your device).
For those who dont need RTS/CTS and/or ICANON, you can use linux command : stty.
Here's mine :
<?php
exec('stty -F /dev/ttyS0 4800 raw');
$fd=dio_open('/dev/ttyS0',O_RDWR | O_NOCTTY | O_NDELAY);
dio_fcntl($fd,F_SETFL,0);
dio_write($fd,'x41',1); // write 0x41 or 'A' to /dev/ttyS0
// Replace result_length with your expected command result length
for ($i=0;$i < result_length;$i++) {
$result .=dio_read($fd, 1);
}
echo $result;
?>
Refer to :
- Serial Programming Guide for POSIX Operating Systems, http://www.easysw.com/~mike/serial/
- stty man pages
Php Serial Port Communication Linux Games On Steam
Hyperterminal
I wonder if there is a way to accomplish reading my serial port via PHP - that works:-) In practising my Arduino skills, I developed a simple LED ON/OFF sketch. It works by entering on or off in. On Linux, all serial ports are driven the same way. Only their device nodes are changing to reflect the port type: i.MX processor internal ports. It was frustrating at first because I was trying to get my Linux box to talk to an external serial device (a PIC18F452 programmable chip) and the example provided here refers to fcntl() and open() parameters that aren't in the PHP documentation.