linux-kernel - timer Q : request callback 2 ms after interrupt to drop RTS on RS485

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Message-ID: <20101215105626.GA3083@frolo.macqel>
Date:	Wed, 15 Dec 2010 11:56:26 +0100
From:	Philippe De Muyter <phdm@...qel.be>
To:	linux-kernel@...r.kernel.org
Subject: timer Q : request callback 2 ms after interrupt to drop RTS on
	RS485

Hello linux timer experts

I need to arm a timer to expire about 1.5 ms after an interrupt.

How can I do that ?

Thanks in advance

Philippe

More context for the interested ones : I need to deactivate the RTS signal
on a serial line, but I get only TxREADY interrupts, not TxEMPTY ones.
Knowing the hardware and baud rate involved I know how much time is needed
to flush the last bytes and bits and I need to drop RTS as soon as the
last bit is sent.
Of course, in the timer callback I'll do a small amount of busy waiting
to be sure TxEMPTY state is reached.

-- 
Philippe De Muyter  phdm at macqel dot be  Tel +32 27029044
Macq Electronique SA  rue de l'Aeronef 2  B-1140 Bruxelles  Fax +32 27029077
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