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
dio_tcsetattr
(PHP 4 >= 4.3.0, PHP 5 < 5.1.0)
dio_tcsetattr — Define os atributos do terminal e a taxa de transmissão para uma porta serial
Descrição
dio_tcsetattr() define os atributos do terminal e a taxa de
transmissão do fd aberto.
Parâmetros
-
fd -
O descritor de arquivo retornado por dio_open().
-
options -
As opções atualmente disponíveis são:
-
'baud' - taxa de transmissão da porta - pode ser 38400,19200,9600,4800,2400,1800, 1200,600,300,200,150,134,110,75 ou 50. O valor padrão é 9600.
-
'bits' - bits de dados - pode ser 8,7,6 ou 5. O valor padrão é 8.
-
'stop' - bits de parada - pode ser 1 ou 2. O valor padrão é 1.
-
'parity' - pode ser 0,1 ou 2. O valor padrão é 0.
-
Valor Retornado
Nenhum valor é retornado.
Exemplos
Exemplo #1 Configurando a taxa de transmissão em uma porta serial
<?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;
}
}
?>Notas
Nota: Esta função não foi implementada em plataformas Windows.
add a note
User Contributed Notes 3 notes
daniel widyanto (kunilkuda at gmail dot com) ¶
19 years ago
fherrero at noticiasdenavarra dot com ¶
19 years ago
For Windows the Example 1 looks same this one:
<?php
exec('mode com1: baud=9600 data=8 stop=1 parity=n xon=on');
// execute 'help mode' in command line of Windows for help
$fd = dio_open('com1:', O_RDWR);
while (1) {
$data = dio_read($fd, 256);
if ($data) {
echo $data;
}
}
?>
healer at colorado dot edu ¶
21 years ago
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.
I finally found out what does what through the man pages:
man open
man fcntl
still haven't gotten it to work, or how to reset the ttySx, but thought it may help someone...
