[maemo-developers] [maemo-developers] Getting the pl2303 usb serial driver to work with /dev/ttyUSB0

Wed Feb 22 04:29:19 EET 2006

Ed,

  The problem was the belkin hub, using an iogear all works.  Oddly I cannot find a problem with the belkin in "normal" use -- all a ports work under suse, as does the b port.  

  This makes me worry about the cable hack, could there be a floating ground between the a && b ports in some hubs, etc ?

  Anyway I can open /dev/ttyUSB0 and open, tcsetattr, install signal handlers, etc.

  Thanks!

  Mark

>-----Original Message-----
>From: Ed Bartosh [mailto:Eduard.Bartosh at nokia.com]
>Sent: Monday, February 20, 2006 04:49 AM
>To: ext markc at catsandwich.com
>Cc: ext maemo-developers-bounces at maemo.org, maemo-developers at maemo.org
>Subject: Re: [maemo-developers] Getting the pl2303 usb serial driver to work with /dev/ttyUSB0
>
>Hi,
>
>I'm sorry, I missed your point. I thought you need console on usb2serial
>device.
>
>I'd suggest you to get console first just to make sure everything is ok,
>then try with your application. If getty works and your application
>doesn't you always can look into getty sources :)
>
>My environment:
>
>I'm using ATEN USB-Serial converter model UC-232A and
>modified USB HUB Targus model PA050.
>
>Here is what I have in dmesg when I connect the usb2serial device:
>[ 121.367797] USB cable connected
>[ 121.475891] hub 1-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
>[ 121.482788] usb 1-1: USB disconnect, address 2
>[ 121.654632] usb 1-1: new full speed USB device using ohci and address 3
>[ 121.885620] hub 1-1:1.0: USB hub found
>[ 121.890502] hub 1-1:1.0: 4 ports detected
>[ 122.013061] usb 1-1: 92mA over 8mA budget!
>[ 122.017425] hub 1-0:1.0: 92mA over power budget!
>[ 122.235351] usb 1-1.1: new full speed USB device using ohci and address 4
>[ 122.334350] usb 1-1.1: device v0557 p2008 is not supported
>[ 122.362060] pl2303 1-1.1:1.0: PL-2303 converter detected
>[ 122.385772] usb 1-1.1: PL-2303 converter now attached to ttyUSB0
>
>And device node has been also created by udev:
>Nokia770-07:~# ls -l /dev/ttyUSB*
>crw-rw---- 1 root dialout 188, 0 Jan 4 21:06 /dev/ttyUSB0
>
>This is from /proc/bus/usb/devices:
>
>T: Bus=01 Lev=02 Prnt=03 Port=00 Cnt=01 Dev#= 4 Spd=12 MxCh= 0
>D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
>P: Vendor=0557 ProdID=2008 Rev= 3.00
>S: Manufacturer=Prolific Technology Inc.
>S: Product=USB-Serial Controller
>C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
>I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303
>E: Ad=81(I) Atr=03(Int.) MxPS= 10 Ivl=1ms
>E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
>E: Ad=83(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
>
>
>Good luck!
>
>On Mon, 2006-02-20 at 00:54 +0000, ext markc at catsandwich.com wrote:
>> Ed,
>> 
>> Many thanks for the reply -- I am using an IOGEAR GUC232A, which works fine on my SuSe 9.3 dev machine.
>> 
>> Just to make sure I flashed to the latest image 2005.51-13 -- thus replacing my custom kernel. No /dev/ttyUSB0, etc.
>> 
>> I don't need a getty, just a serial device. We hope to be able to talk to the rs-232 port on a very specialized bit of test equipment using software that already runs on a SuSe 9.3 laptop. Our app builds fine under the SDK_ARM, and is very generic -- only using bits of:
>> 
>> #include <termios.h>
>> #include <stdio.h>
>> #include <unistd.h>
>> #include <fcntl.h>
>> #include <sys/signal.h>
>> #include <sys/types.h>
>> 
>> Once I am able to talk to the device our hope is to add a GUI for display of acquired spectra, calibration, etc. It would be wonderful not to have to lug a laptop about as is done now.
>> 
>> As of now -- I am thinking it may be the hub -- still looking.
>> 
>> Thanks,
>> 
>> Mark
>> 
>> 
>> >-----Original Message-----
>> >From: Ed Bartosh [mailto:Eduard.Bartosh at nokia.com]
>> >Sent: Sunday, February 19, 2006 04:52 PM
>> >To: ext maemo-developers-bounces at maemo.org
>> >Cc: maemo-developers at maemo.org
>> >Subject: Re: [maemo-developers] Getting the pl2303 usb serial driver to work with /dev/ttyUSB0
>> >
>> >Hi,
>> >
>> >PL2303 driver is compiled into n770 kernel:
>> >grep ^CONFIG_USB_SERIAL arch/arm/configs/n770_defconfig
>> >CONFIG_USB_SERIAL=y
>> >CONFIG_USB_SERIAL_CONSOLE=y
>> >CONFIG_USB_SERIAL_PL2303=y
>> > 
>> >My pl2303-compatible usb-2-serial adapter works with n770 without any modifications.
>> >Unfortunately I don't remember the model. I'll tell you tomorrow if it's needed.
>> >
>> >And you probably don't need to makedev devices. udev should take care of them.
>> >inittab should also be modified to run getty on ttyUSB0 if usb2serial device is 
>> >connected to n770 on boot stage. 
>> >Look at /etc/init.d/ttyusb for the details. 
>> >
>> >On Sun, 2006-02-19 at 19:36, ext maemo-developers-bounces at maemo.org wrote:
>> >> Hello,
>> >> 
>> >> 
>> >> I need to get usbserial working so that my application can communicate with a bit of specialized hardware via rs-232 -- using a PL2303 USB to serial adapter.
>> >> 
>> >> I've checked the kernel config and see the pl2303 driver is there, and have rebuilt the kernel without the serial console (under the usbserial config).
>> >> 
>> >> Flashed the kernel, and used flasher to enable USB host, etc.
>> >> 
>> >> MAKEDEV usb builds the device special files, /dev/ttyUSB0, etc.
>> >> 
>> >> However I cannot open the device -- "so such device" error.
>> >> 
>> >> Has anyone else done this ?
>> >> 
>> >> Any info, suggestions would be most welcome.
>> >> 
>> >> Thanks.
>> >> 
>> >> Mark
>> >> 
>> >> 
>> >> 
>> >> 
>> >> _______________________________________________
>> >> maemo-developers mailing list
>> >> maemo-developers at maemo.org
>> >> https://maemo.org/mailman/listinfo/maemo-developers
>> >-- 
>> >Best regards,
>> >Ed
>> >_______________________________________________
>> >maemo-developers mailing list
>> >maemo-developers at maemo.org
>> >https://maemo.org/mailman/listinfo/maemo-developers
>> >
>> 
>> 
>-- 
>Ed
>
>