Hi Richard,
You are write, the uIP implementation is DMA driven, however the lwIP stack
sample which is written for the Stellaris MCUs writes to a FiFO, I don't
know if that is a DMA address on that micro , or not.
i.e in the read function you get the following:
------------------------------------------------------- code
---------------------------------------------
/* Process all but the last buffer in the pbuf chain. */
q = p;
do {
/* Setup a byte pointer into the payload section of the pbuf. */
unsigned long *ptr = (unsigned long *)q->payload;
/**
* Read data from FIFO into the current pbuf
* (assume pbuf length is modulo 4)
*/
for (i = 0; i < q->len; i += 4) {
*ptr++ = ETH->DATA;
}
/* Link in the next pbuf in the chain. */
q = q->next;
} while (q != NULL);
------------------------------------------- end code
----------------------------------------------------
I will need to investigate what ETH->DATA is .. and replace it with a call
to read the DMA channel .. and ditto for the write ..
Cheers,
Bernie
On Fri, Feb 4, 2011 at 10:48 AM, FreeRTOS Info <nos...@freertos.org> wrote:
> Hi again,
>
> The drivers in FreeRTOS are interrupt (and I think DMA (?)) driven. The
> driver moves a packet into a buffer pointed to by a chain of DMA
> descriptors, thats it. I don't see why the driver would not be agnostic
> of the stack it is being used with - the packets coming in off the
> network will be the same - the reception and buffering of the packets by
> the DMA will be the same - only how the packets are read from the
> buffers by the stack will be different and that is not part of the
> driver but part of the stack.
>
>
> Regards,
> Richard.
>
> + http://www.FreeRTOS.org
> Designed for Microcontrollers. More than 7000 downloads per month.
>
> + http://www.SafeRTOS.com
> Certified by TÜV as meeting the requirements for safety related systems.
>
>
>
> On 03/02/2011 20:57, Bernard Mentink wrote:
> > Hi There,
> >
> > Yes, I do have uIP working on the LPC1766, so I can use their drivers
> > ... they don't use interrupts, just polling, so will need to do some
> > hacking there
> > (I am also using it with QP OS so every thing needs to be event based ..)
> >
> > Reason I am asking, is to try and save myself the work of porting the
> > uIP driver to lwIP, which does need a chunk of work .. so if anyone has
> > done it, that would be cool?
> >
> > Cheers,
> > Bernie
> >
> > On Fri, Feb 4, 2011 at 9:34 AM, FreeRTOS Info <nos...@freertos.org
> > <mailto:nos...@freertos.org>> wrote:
> >
> > Hi,
> >
> > If you look at the LPC1768 demos in the FreeRTOS download you will
> find
> > uIP demos, but the drivers are probably just as relevant to lwIP.
> >
> > Regards,
> > Richard.
> >
> > + http://www.FreeRTOS.org
> > Designed for Microcontrollers. More than 7000 downloads per month.
> >
> > + http://www.SafeRTOS.com
> > Certified by TÜV as meeting the requirements for safety related
> systems.
> >
> >
> >
> > On 03/02/2011 19:09, Bernard Mentink wrote:
> > > Hi all,
> > >
> > > Does anyone have a port to this family of micros? I guess I am just
> > > wanting the eth_driver.c and eth_driver.h files ...
> > >
> > > Many Thanks,
> > > Bernie
> > >
> > > --
> > > You always have believers and scepticts.. A True inventor is always
> a
> > > believer..
> > >
> > >
> > >
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> >
> >
> >
> > --
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> > believer..
> >
> >
> >
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believer..
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