Stopping /dev/ttyUSB0

WoldemarShiPa · 04-21-2014, 02:30 AM

Hello. I have USB-to-CAN converter detected as ttyUSB0. I use only library provided by manufacturer to operate device. But it seems this library doesn't close port properly, because I still can cat port data after execution its close() func. So, I should to re-plug USB cable to stop device and then I'm able to open port second time. Is there any way to stop port? Thanks

michaelk · 04-21-2014, 07:08 AM

Welcome to LinuxQuestions.

What are you trying to accomplish? Are you trying to prevent writing to the device from out side your program?

Device files i.e. /dev/ttyUSB0 are opened and closed for reading and writing just like any other file.

WoldemarShiPa · 04-22-2014, 01:41 AM

I have demo program for converter provided by manufacturer. When I quit demo program, port is still opened, I can cat data from it. When I try to run demo program second time it can't establish connection. Demo program uses its own library. It seems like library close() function is wrong. So, I'm looking for way to close port.