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Re: wiggle with the CTS pin


Giri Raja <giri_amf@yahoo.com> writes:

> Hi,
>    I need to send a 'LO' signal to the CTS pin in one
> of my serial ports, on an EB40A board. Is there any
> API to do this?
> there was an email on this issue last month --
> http://sources.redhat.com/ml/ecos-discuss/2004-07/msg00109.html
> 
> just wanted to know if anything exists already.

You have the basic problem here that the RTS/CTS lines on the EB40A
serial connectors are not controllable. Those on serial A are
connected together, so RTS just reflects CTS, and they are not
connected at all on serial B. Even if they were controllable, it would
have to be via PIO pins since the AT91 USARTs do not support anything
other than TXD and RXD.

Also, when you say CTS, I guess you mean the CTS input to the remote
end of the line, which should be the RTS output at this end. So, if
you use serial A and get your remote end to hold its RTS low, then the
reflected CTS will be low too.


-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts


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