Driver for USB->RS232

[anilsen]

Hi.

I have a 4x2 HDMI matrix with RS232 interface and I want to control this from my popcornhour box. I want to connect a STLAB USB RS232 adapter to my popcorn box USB port and RS232 to the matrix.

Through my own application on the PopcornHour I want to control the matrix.

When I connect the adapter to the PH unit and type dmesg I get a entry in log:

usb 2-1: new full speed USB device using tangox-ohci-hcd and address 2

(I can also see in the /dev/ directory : usbdev1.1 usbdev2.1 usbdev2.2.)

How do I access the serial port from my "C" application ?

Do I need to install a driver. On the driver cd, there are some file call pl2303.c. I did not manage to compile this. Get a lot of errors

I am not a linux expert, so is there anyone that can point me in to the right direction.

André

[bdb]

(10-07-2009 03:24 PM)anilsen Wrote:  Do I need to install a driver. On the driver cd, there are some file call pl2303.c.

You will need a driver ... here is one I compiled earlier.
(also includes a driver for the ftdi equivalent, an ati rf remote, and a 'garmin_gps' driver - whatever that may be)

for the pl2303,
run

Code:

insmod usbserial.ko
insmod pl2303.ko

you should not see any error messages; to check it is installed correctly, run

Code:

dmsg

and check the last few lines of the logfile. You should see something like:

Code:

usbserial: No versions for exported symbols. Tainting kernel.
usbcore: registered new driver usbserial
drivers/usb/serial/usb-serial.c: USB Serial Driver core
drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303
usbcore: registered new driver pl2303
drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver

Plug the pl2303, run dmesg again, you should see something like:

Code:

usb 1-2: USB disconnect, address 2
dvb-usb: Hauppauge Nova-T Stick successfully deinitialized and disconnected.
usb 2-2: new full speed USB device using tangox-ohci-hcd and address 2
drivers/usb/serial/usb-serial.c: descriptor matches
drivers/usb/serial/usb-serial.c: found interrupt in on endpoint 0
drivers/usb/serial/usb-serial.c: found bulk out on endpoint 1
drivers/usb/serial/usb-serial.c: found bulk in on endpoint 2
pl2303 2-2:1.0: pl2303 converter detected
drivers/usb/serial/usb-serial.c: get_free_serial 1
drivers/usb/serial/usb-serial.c: get_free_serial - minor base = 0
drivers/usb/serial/usb-serial.c: usb_serial_probe - setting up 1 port structures for this device
drivers/usb/serial/usb-serial.c: usb_serial_probe - registering ttyUSB0
usb 2-2: pl2303 converter now attached to ttyUSB0

I've never tried to use it, it looks like you should now be able to use /dev/ttyUSB0 as a conventional serial port.

bdb

---

(10-07-2009 08:08 PM)bdb Wrote:  I've never tried to use it, it looks like you should now be able to use /dev/ttyUSB0 as a conventional serial port.

just tried it; seems to work ok

to setup the serial port parameters, use stty, e.g.

Code:

stty -F /dev/ttyUSB0 cs8 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts

echo "hello" > /dev/ttyUSB0     - sends data
cat /dev/ttyUSB0                - receives data

bdb

[anilsen]

:)Thank you bdb

I have test your describtion, but I can not get it to work.

When I run command:
stty -F /dev/ttyUSB0 cs8 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts

The program newer return to the console.

I also tried to write my own application and my program hangs when command is excuted:

tcsetattr(fd, TCSANOW, &tio);

Here is the dump from dmesg:

usbserial: No versions for exported symbols. Tainting kernel.
usbcore: registered new driver usbserial
drivers/usb/serial/usb-serial.c: USB Serial Driver core
drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303
usbcore: registered new driver pl2303
drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver
usb 2-1: new full speed USB device using tangox-ohci-hcd and address 2
drivers/usb/serial/usb-serial.c: descriptor matches
drivers/usb/serial/usb-serial.c: found interrupt in on endpoint 0
drivers/usb/serial/usb-serial.c: found bulk out on endpoint 1
drivers/usb/serial/usb-serial.c: found bulk in on endpoint 2
pl2303 2-1:1.0: pl2303 converter detected
drivers/usb/serial/usb-serial.c: get_free_serial 1
drivers/usb/serial/usb-serial.c: get_free_serial - minor base = 0
drivers/usb/serial/usb-serial.c: usb_serial_probe - setting up 1 port structures
for this device
drivers/usb/serial/usb-serial.c: usb_serial_probe - registering ttyUSB0
usb 2-1: pl2303 converter now attached to ttyUSB0
drivers/usb/serial/usb-serial.c: serial_open
drivers/usb/serial/usb-serial.c: serial_ioctl - port 0, cmd 0x540d
drivers/usb/serial/usb-serial.c: serial_ioctl - port 0, cmd 0x5407
drivers/usb/serial/usb-serial.c: serial_ioctl - port 0, cmd 0x540e
drivers/usb/serial/usb-serial.c: serial_set_termios - port 0
drivers/usb/serial/usb-serial.c: serial_open
drivers/usb/serial/usb-serial.c: serial_ioctl - port 0, cmd 0x540d
drivers/usb/serial/usb-serial.c: serial_ioctl - port 0, cmd 0x5407
drivers/usb/serial/usb-serial.c: serial_ioctl - port 0, cmd 0x540e


Do you have any tips of have to solve it.

ASN