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Full Discussion: Writing to a Serial Port
Top Forums Web Development Writing to a Serial Port Post 302921764 by wisecracker on Monday 20th of October 2014 08:16:21 AM
Old 10-20-2014
As I don't use Minicom then I don't know its quirks but......
This assumes you have Minicom running.
Code:
-----------------------------------------------------------------------+                                  
Comp| A -    Serial Device      : /dev/ttyS0                                |                                  
Port| B - Lockfile Location     : /var/lock                                 |                                  
    | C -   Callin Program      :                                           |                                  
Pres| D -  Callout Program      :                                           |                                  
    | E -    Bps/Par/Bits       : 9600 7E1                                  |                                  
    | F - Hardware Flow Control : Yes                                       |                                  
    | G - Software Flow Control : No                                        |                                  
    |                                                                       |                                  
    |    Change which setting?                                              |                                  
    +-----------------------------------------------------------------------+

1) Change (F) to No ; this disables HW control.
2) You can leave (E) alone FTTB.
3) Connect the loopback plug to the serial port.
4) Just typing on the keyboard now should print the characters to the terminal emulator window.
5) Now try changing (G) to Yes and try again.
6) Let us know your results...
 

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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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