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pl2303 serial port + usb hub
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tgraf
Joined: 25 Jan 2013, 08:59 Posts: 3
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Hi,
I developed a software that relies on a usb stick to communicate with a radio network. The USB stick essentially is a usb serial converter (pl2303), it is correctly detected and found in /dev/ttyUSB0. If I just plug the Usb stick into the devboard and then run my programm everything works fine. But when I use a usb hub between the stick and the board, then run my programm, the whole system is going very slow (ssh connection takes years to connect, a simple "ps" takes about 2 sec ...). I already tried another usb hub, same problem. USB-Stick -> devboard => runs fine USB-Stick -> USB hub -> devboard => everything slow
So do you have any suggestions what could cause this problem or what i can do?
Thanks in advance
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25 Jan 2013, 09:26 |
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Saulius
Joined: 08 Dec 2011, 09:35 Posts: 138
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Try FTDI chip based USB to serial converter. PL* and some other "low end" converters have issues with drivers (also applies to PC's, MAC's, etc).
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25 Jan 2013, 14:00 |
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tgraf
Joined: 25 Jan 2013, 08:59 Posts: 3
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hi
thanks for your reply. I think I didn't express myself clearly enough, I can't modify the usb stick (I just bought it), so I can't change the pl2303 to a ftdi chip. The stick also works fine on windows and linux machines (both with and without hub). You got any other suggestions?
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25 Jan 2013, 14:20 |
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Saulius
Joined: 08 Dec 2011, 09:35 Posts: 138
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You can debug usb driver, this could help answering some questions. Else, try different hardware configurations.
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25 Jan 2013, 14:42 |
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DominikS
Joined: 25 Oct 2012, 06:24 Posts: 26
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Are you using wi-fi? Then try turning it off.
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28 Jan 2013, 06:36 |
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tgraf
Joined: 25 Jan 2013, 08:59 Posts: 3
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yes i'm using wifi. I disabled it but that didn't help
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30 Jan 2013, 08:18 |
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