[help]How to use libusb in uClinux

I found a link about existing lib in uClinux for blackfin (my post count isn't enough, so I can't post link here), it say that libusb is provided by uClinux-dist.

Could I use it for uClinux in Nios? How to use or port it?

Thanks.

I've just put all libusb code into my own code and compile ok, it work.

But how to compile libusb as a library?

Hi,

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I've just put all libusb code into my own code and compile ok, it work.

But how to compile libusb as a library?

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Please enter the directory of 'libusb/libusb-0.1.12' and do

./configure --help

.

Maybe you can see the option '--enable-shared' or '--enable-static'.

Kazu

Thanks for your help, Kazu.

Now I have another problem, please help me.

I tried to work with a usb 3G from huawei. I could get it change to modem mode, then I load the usbserial driver and it show some success msg, it create ttyUSB0, 1, 2, and 3. I can use cat to get data from ttyUSB3, but I can't write command to any of those ttyUSB. I try both echo command from shell and C write function. What should I fix now?

Thanks.

Hi,

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I tried to work with a usb 3G from huawei. I could get it change to modem mode, then I load the usbserial driver and it show some success msg, it create ttyUSB0, 1, 2, and 3. I can use cat to get data from ttyUSB3, but I can't write command to any of those ttyUSB. I try both echo command from shell and C write function. What should I fix now?

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At first, check the permission of 'ttyUSB' . like

ls -lp /dev/ttyUSB*

If it's OK, then check the return value of the function 'write' or something, and if it reports some error, check the value 'errno'. If it reports no error,....

Kazu

Thanks Kazu.

Now I can write to ttyUSB0, but when I use "cat /dev/ttyUSB0" from telnet terminal, and write "at<cr><lf>" to ttyUSB0 from jtag terminal, I receive a lot of "at ok at ok at ok..." from telnet terminal. If I do the same on my Ubuntu PC, I receive just 1 "at ok" as normal. Besides that, when I use "chat" program in uClinux to communicate with my usb3g, it can't get any response back. I can't understand this strange :(:( , please help.

Thanks.

Hi,

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Now I can write to ttyUSB0, but when I use "cat /dev/ttyUSB0" from telnet terminal, and write "at<cr><lf>" to ttyUSB0 from jtag terminal, I receive a lot of "at ok at ok at ok..." from telnet terminal. If I do the same on my Ubuntu PC, I receive just 1 "at ok" as normal.

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I think that you are sending 'AT' commands to your 3G modem. Maybe your modem echo-back the command to your serial terminal and it may make troubles. How about the mode of echo-back?

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Besides that, when I use "chat" program in uClinux to communicate with my usb3g, it can't get any response back. I can't understand this strange :(:( , please help.

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I don't know such thing. The only way to help you is 'Debugging' by yourself!

Kazu

Thanks.

I think this problem cause by usbserial driver in uClinux, because every test I made on Ubuntu PC is ok. Maybe I'll try to replace uClinux's usbserial driver by those on my PC.

Hi,

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Maybe I'll try to replace uClinux's usbserial driver by those on my PC.

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Replace ? You mean recompile it from the source for Nios?

Kazu