Re: [avr-chat] Flow control with Butterfly

[Trevor White]

Hi, maybe you could put a big pause between each char sent to see if it 
is overhead....

Pertti Kellomäki wrote:

> I am writing a data logging application using the Butterfly
> as the target hardware. I can talk to the  Butterfly using a
> terminal, but if I try to talk to it with a Python program,
> some characters get lost.
>
> I have used the application shipped with the Butterfly as
> a starting point, so when receiving from the uart my program
> also continually polls the pins connected to the joystic. The
> LCD driver is also working at the same time.
>
> Now my question is: should I need flow control at all, and
> if so, what should it be? My hunch is that at 9600 baud the
> Butterfly should not have any problems keeping up, but
> I don't have any idea of e.g. the overhead of the LCD driver.
>
> The easiest way out for me is to implement a simple minded
> protocol, where the Butterfly echoes everything back, and
> the PC side reads each character before sending the next
> one. This is not very elegant, though, so I am thinking of
> interrupt-driven receiving from the uart.
>
> I could implement hardware flow control, but I an unsure
> whether all PC serial ports respect rts/cts signals. It also
> seems that I would neet to generate them by software on
> the Butterfly.
>
> Any thoughts?




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