RE: [ECOS] serial port ARM e7t problem

["Robert Cragie" <rcc at jennic dot com>]

I had a similar problem on the Integrator platform (running out of flash at
a fairly slow speed on an ARM7TDMI) and managed to improve performance by
adding a simple FIFO buffer in the ISR and ensuring Rx interrupts remained
enabled. The DSR then reads out of the FIFO buffer; if further characters
arrive in the time it takes for the DSR to be scheduled, they will go into
the FIFO buffer. The current rudimentary e7t serial driver will keep Rx
interrupts disabled until the DSR completes, which makes it more likely that
overflow in the Rx holding register would occur.

As someone has already pointed out, you could also try using the DMA
somehow, but I can't offer any more advice on this.

Robert Cragie, Design Engineer
________________________________________________________
Jennic Ltd, Furnival Street, Sheffield, S1 4QT,  UK
www.jennic.com Tel: +44 (0) 114 281 2655


> -----Original Message-----
> From: ecos-discuss-owner@sources.redhat.com
> [mailto:ecos-discuss-owner@sources.redhat.com]On Behalf Of Vinayak P
> Risbud
> Sent: 16 July 2002 14:38
> To: Ecos-Discuss
> Subject: [ECOS] serial port ARM e7t problem
>
>
>     Hi,
>         I have set, ARM e7t port to Baud 38400,
>         I think, the board interrupts the ARM core
>         for every character read. (instead of for a
>         bunch of characters)
>         And because of this,  I am loosing some
>         characters, Can anyone give me, any solution
>         for this problem ?
>
>
>         ~
>             Vinayak
>
>     ~
>         Vinayak
>
>
> --
> Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
> and search the list archive: http://sources.redhat.com/ml/ecos-discuss
>
>


-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss