Re: synchronous serial port communication (16550A)

[Miquel van Smoorenburg]

In article <40600CDD.5050807@xxxxxxxxxxx>,
Christof  <mail@xxxxxxxxxxx> wrote:
>I have a possible problem with the 8250 serial port driver in linux (2.6.2).
>I communicate with a graphic controller with LCD-Display via ttyS0. This
>controller has a small buffer: 20 bytes. When the buffer is full it
>asserts the CTS line. When it can receive data again, the CTS line is
>cleared.
>My software checks the CTS line each time before sending a byte. If it
>is asserted, it waits until its cleared and goes on. When data is sent
>although CTS is asserted, the graphic controller will be confused and
>garbage will appear on the LCD screen.

Why don't you simply turn on hardware flow control (i.e. enable
CRTSCTS with tcsetattr() or even stty) ?

Mike.
-- 
Netu, v qba'g yvxr gur cynvagrkg :)

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