CPM2 SCC/SMC break handling broken

[Ricardo Scop]

On Thursday 26 October 2006 06:02, Laurent Pinchart wrote:
> Hi everybody,
>
> I need to generate a break on a CPM2 SMC serial port (same issue with SCC
> serial ports).
>
> The tcsendbreak() man page states that the function should generate a break
> between 250ms and 500ms, but testing showed that the break is one character
> long (10 bits in 8N1 mode).

[snip]

> CPM_CR_STOP_TX is documented to generate a break of BRKCR characters. The
> BRKCR register is initialized to 1, so only 1 break character is sent,
> which won't last between 250ms and 500ms.

[snip]

> Could anyone think of a proper solution which would not disturb the other
> drivers too much ?

Well, one could always set the BRKCR parameter to the maximum number of break 
characters permitted by it's size, since the break condition will anyway end 
as soon as the RESTART TX command is issued as a consequence of the 
tty->driver->break_ctl(tty, 0) call. But I did not test this.

HTH,

-- 
Ricardo Scop.

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