Reading data from a serial port Post: 302919881

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Operating Systems Linux Debian Reading data from a serial port Post 302919881 by wisecracker on Sunday 5th of October 2014 09:26:20 AM

10-05-2014

Registered User

Sometimes a serial transfer can be a RPITA...
There is usually a buffer of _at_least_ 256 bytes to fill first, so........
........try this sequence of events as a starter test mode from root TO assume a 3 wire system only:-
(RTS and CTS should be ignored using the below.)

Code:

1) Close down your terminal completely and do a reboot of your machine.
2) In root mode open up a new terminal then...
3) Number 4) below is optional...
4) chmod 666 /dev/ttyS0
5) Check the status of your /dev/ttyS0
6) Note that your stty might need -f instead of -F and may already be at 9600bps...
7) stty -F /dev/ttyS0
8) Set up the on board serial I/O to 9600bps and RAW data transfer, in my case, for PCLinuxOS and Debian.
9) Again note that your stty might need -f instead of -F ...
10) stty -F /dev/ttyS0 9600
11) stty -F /dev/ttyS0 raw
12) Finally, again check the status of your /dev/ttyS0
13) And again, note that your stty might need -f instead of -F ...
14) stty -F /dev/ttyS0
15) Now start printing, (blocks of?), characters to the terminal window...
16) cat < /dev/ttyS0
17) It might take a second or so to fill your default serial buffer and may display a 256 byte  burst on each access so be aware.

Hope this works for you...

wisecracker

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LEARN ABOUT DEBIAN

reader.conf

READER.CONF(5)							    PC/SC Lite							    READER.CONF(5)

NAME

       reader.conf - configuration file for pcscd readers' drivers

DESCRIPTION

       The /etc/reader.conf.d/reader.conf file contains configuration information for serial and (some) PCMCIA smart card readers.

       USB readers SHALL NOT be configured using this file.  pcscd uses another mechanism to automatically load USB drivers.

SYNTAX

       The /etc/reader.conf.d/reader.conf is a regular text file. Each reader must be defined by four fields:

	FRIENDLYNAME	 TEXT_STRING
	DEVICENAME	 FILENAME
	LIBPATH 	 FILENAME
	CHANNELID	 NUMBER

       The "FRIENDLYNAME" field is an arbitrary text used to identify the reader. This text is displayed by commands like pcsc_scan(1) that prints
       the names of all the connected and detected readers.

       The "DEVICENAME" field was not used for old drivers (using the IFD handler version 2.0 or earlier). It is now  (IFD  handler  version  3.0)
       used  to  identify the physical port on which the reader is connected. This is the device name of this port. It is dependent of the OS ker-
       nel. The first serial port device is called /dev/ttyS0 under Linux and /dev/cuaa0 under FreeBSD.

       The "LIBPATH" field is the filename of the driver code. The driver is a dynamically loaded piece of code (generally a drivername.so*file).

       The "CHANNELID" is no more used for recent drivers (IFD handler 3.0) and has been superseded by "DEVICENAME". If you  have  an  old  driver
       this  field  is	used  to  indicate  the port to use. You should read your driver documentation to know what information is needed here. It
       should be the serial port number for a serial reader.

EXAMPLE

	# Gemplus GemPCTwin reader with serial communication
	# connected to the first serial port
	FRIENDLYNAME	  "GemPCTwin serial"
	DEVICENAME	  /dev/ttyS0
	LIBPATH 	  /usr/lib/pcsc/drivers/serial/libccidtwin.so.0.4.1
	CHANNELID	  1

DEBUGGING

       In order to set up your /etc/reader.conf.d/reader.conf file correctly you may want to have debug messages from pcscd.  I recommend  you	to
       start pscsd in the foreground and debug mode using:
	# pcscd --foreground --debug

       If  everything  seems  OK  you can use the pcsc_scan command to print the list of correctly detected readers and try to get the ATR of your
       smart cards.

AUTHOR

       Ludovic Rousseau <ludovic.rousseau@free.fr>

SEE ALSO

       pcscd(8), pcsc_scan(1)

Muscle								    August 2005 						    READER.CONF(5)