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Re: Serial device driver problem.
- To: "Dennis Ehlin (ECS)" <Dennis dot Ehlin at ecs dot ericsson dot se>
- Subject: Re: [ECOS] Serial device driver problem.
- From: "David Airlie" <David dot Airlie at parthus dot com>
- Date: 30 May 2001 10:53:08 +0100
- Cc: ecos-discuss at sources dot redhat dot com
are you sure you are (or the 16x5x) is clearing the interrupt correctly on
your target? if not you will exit the ISR, enter the DSR, exit the DSR
enter the ISR... and never go back to the scheduler..
Dave.
On Tue, 29 May 2001, Dennis Ehlin (ECS) wrote:
> Hi,
>
> I'm trying write a serial device to my ppc target, i'm using the generic 16x5x uart code.
> I have the serial interrupts working and so on...
>
> When i do a serial_read (located serial.c) everything seems to work ok, and i get to the
> cyg_drv_cond_wait(&cbuf->wait) line and it stops there to wait for the cbuf->wait signal. ok.
>
> Then i generate a serial receive interrupt and the serial_rcv_char function is called,
> which sends the cbuf->wait signal with the line cyg_drv_cond_signal(&cbuf->wait).
>
> But nothing happends?, the cyg_drv_cond_wait(&cbuf->wait) never continues, as if it never gets the
> signal.
>
> I suppose there's alot of things that can go wrong, but I dont have a clue of what is happening there.
> Does anyone know of something that could cause this ?
>
> (I use the serial_echo test to test this)
>
> //Dennis
>
>
--
David Airlie, Software Engineer, Parthus Technologies plc.,
Mary Rosse Centre, National Tech Park, Limerick, Ireland.
t: +353-61-508116 / f: +353-61-508101 / David.Airlie@parthus.com