Re: [Ftdi-usb-sio-devel] about XON/XOFF

[Tao J. <jin...@gm...>]

Hi,

I figured out why.

Besides setting IXON IXOFF flags, I also need to specify the VSTART
and VSTOP value in c_cc option.

Now it works.

thanks,

jintao

On Thu, Jul 8, 2010 at 10:50 AM, Tao Jin <jin...@gm...> wrote:
> thanks bill!
> I set the IXON and IXOFF flags in my our serial io program by doing
> c_flag |= IXON | IXOFF
> But when the serial dev sends XOFF, the pc still can send bytes to the
> serial dev
> Is this the right way to do this?
> Thanks again
> Jintao
>
>
> On Jul 8, 2010, at 3:08, Bill Ryder <bil...@gm...> wrote:
>
> Usually you use the kernel serial stack to handle xon/off
>
> Search google for
>
> termios xon
>
> eg
> http://homepages.cwi.nl/~aeb/linux/man2html/man3/termios.3.html
> and
> http://en.wikibooks.org/wiki/Serial_Programming/termios
>
>
> for example.
>
>
>
> On Thu, Jul 8, 2010 at 11:44 AM, Tao Jin <jin...@gm...> wrote:
>>
>> Dear all,
>>
>> I have a question about serial software flow control.  Here is my
>> experiment setup.
>>
>> PC < ---- > serial device
>>
>> PC1 talks to serial device through minicom.
>>
>> When I send a byte in minicom, the serial device toggle LED to
>> indicate the reception of new byte
>>
>> When serial device receives up to 10 byte, serial device sends
>> XOFF(0x13) byte to PC.
>>
>> I have already enabled software flow control in minicom, so I expect
>> that next time when I send another byte from minicom, the serial
>> device is NOT supposed to receive anything.  b/c the serial driver
>> received XOFF earlier.
>>
>> But XOFF doesn't work for me.
>>
>> My question is should my program takes care of XOFF?  or the serial
>> driver actually takes care of that automatically?
>>
>> thanks a lot in advance!
>>
>> jintao
>>
>>
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>
>