Re: Driver CH341 USB Adapter Serial Port not Works in Linux

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By testing, sometimes even when ENQ command, if they leave these four lines:

ch341_update_line_status - multiple status change
ch341_update_line_status - delta = 0x01
ch341_update_line_status - multiple status change
ch341_update_line_status - delta = 0x01

Always gives Timeout. Apparently there is the problem ... I think XD.

The problem with the driver gives me the kernel 3.12.6 original, a
despairing attempt to update the two files you mentioned, but still
always feel the same. Always respond timeout.


2014-04-14 1:02 GMT-04:30 Kijam López <kijamve@xxxxxxxxx>:
> All commands and responses are formatted: STX data ETX LRC (I replace
> No printable Char for [space]0xXX[space])
>
> If I sent a ENQ answers his state, which is 2 bytes, so replies:  0x02
> `@ 0x03 # (`@ is a two-byte mask representing the internal state of
> the device)
>
> If sending the S1 command, which is " 0x02 S1 0x03 a", I should say
> something like this:
> " 0x02 S100 0x0A 00000000000000000 0x0A 00000479 0x0A 00000 0x0A
> 00000330 0x0A 00000 0x0A 0061 0x0A 0000 0x0A X-XXXXXXXX 0x0A XXXXXXXXX
> 0x0A 221715 0x0A 120414 0x0A  0x03  0x1B "
>
> In Windows OS, it works perfectly with the same PC and the same USB
> adapter. But Linux is not responding. Or respond but the driver is not
> interpreted correctly.
>
> My Kernel is 3.12.6, but i updated from GitHub this file an rebuild
> this drivers:
> https://github.com/torvalds/linux/blob/master/drivers/usb/serial/ch341.c
> https://github.com/torvalds/linux/blob/master/drivers/usb/serial/usb-serial.c
> (commit d9a38a8741fdffabc32e6d0943b1cdcf22712bec)
>
>
> 2014-04-14 0:53 GMT-04:30 Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>:
>> On Mon, Apr 14, 2014 at 12:16:40AM -0430, Kijam López wrote:
>>> I reported here:
>>>
>>>      https://bugreports.qt-project.org/browse/QTBUG-38305
>>>
>>> But just migrate my APP to ANSI C and is exactly the same.
>>>
>>> My code test in ANSI C:
>>>
>>>      <snip>
>>>      Test command: Fail
>>
>> I'm confused, what should it do?
>>
>> And what kernel version are you using here?
>>
>> thanks,
>>
>> greg k-h
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