generic rs232 kernel module

[jjscampos]

Hello everybody

I need to develop an rs232 kernel module and app.

Can someone point me some directions or samples how to start.

[jpollard]

Is there a problem with the existing RS232 drivers?

[jjscampos]

I need a driver module for an Cbm-820 printer. this printer connect to pc via rs232.

I can't find anything on the web for it.

perhaps someone with experience could give me some orientations or samples on this...

thanks for answer jpollard.

[dr death]

Try adding a new printer using the standard printer administration tool. When asked to "enter device URI" try something like:
serial:/dev/ttyS0?baud=11500
(changing the port and baud rate to suit your system of course)
I don't know that there's a driver for your printer, but the generic one should work.

Alternatively drivers for this printer (Java or CUPS) seem to be available here:
http://www.citizen-systems.co.jp/eng...ver/index.html

[jjscampos]

thanks once again.
I posted a message on citizen's web form

In fact, I am doing an academic work, in this regard need to develop a Linux driver for the CBM-820 printer.

can help me realize this project?

[dr death]

If it is an academic project then it depends on the scope. Are you trying to rewrite the serial drivers? For a printer "driver" you can just open the serial port, do whatever serial communications are necessary and then close the port.

If you really need to write a serial driver, check the kernel code (kernel.org) under drivers/serial - it's all there.

If you just need to talk to the printer using the serial port, you don't need a driver. It can be done from user space. Here's a good starting point:
http://tldp.org/HOWTO/Serial-HOWTO.html
http://www.easysw.com/~mike/serial/serial.html
You will also need the full specification for the printer