Hi all



I am testing a board design and I have run into a very strange problem. I
have an Ethernet MAC initialization routine based on examples found around
the net for my lpc2468 however the software will not run. The processor
works as it runs other software testing out parts of the board. However when
I run the following code sequence:



PINSEL2 = 0x10151105; /* selects P1[0,1,4,6,8,9,10,14] */

PINSEL3 = 0x00000005; /* selects P1[17:16] */

/* turn on the ethernet MAC clock in PCONP, bit 30 */

PCONP |= PCONP_EMAC_CLOCK;

delayMs(1); /* Wait 1 ms */

/* write the MAC config registers */

MAC_MAC1 = 0xCF00; /* [15],[14],[11:8] -> soft resets all MAC internal
modules */

MAC_COMMAND = 0x0038; /* reset all datapaths and host registers
*/



delayMs(1); /* Wait 1 ms */

MAC_MAC1 = 0x00; /* deassert all of the above soft resets in
MAC1 */



I never get past the final line accessing MAC_MAC1. After the store
instruction removing the reset the processor freezes and wont even let me
access it through JTAG (making me debug by blinking LEDs the code for that
removed from the above example). The only way to get it back under my
control is to reflash the device. If I run any other of my test code
everything is fine. Reading through the assembly has not revealed anything
strange going on only the mov, str and bl instructions youd expect. I am
using the Yagarto GCC distribution, but I have used that and my setup for
other ARM projects before.



Question: Is there anything obvious to other people on this list that I
should do differently to initialize the Ethernet MAC? Or in general have any
suggestions on this topic?



Best regards

Mikael

Software Engineer @ IO-Connect





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Maybe this is something to do with the EMAC errata
mentioned on the NXP's website. Depending on the
rev. of the chip, you need to set the PINSELx
differently.

http://www.standardics.nxp.com/products/lpc2000/new/~LPC2468/#LPC2468

See errata and get an update of the S/W bundle(Under Support
Docs) which has the example how to set the PINSELx,
initialize the MAC and PHY.

regards,
Tom


--- In l..., Mikael Helbo Kj wrote:
>
> Hi all
>
>
>
> I am testing a board design and I have run into a very strange
problem. I
> have an Ethernet MAC initialization routine based on examples
found around
> the net for my lpc2468 however the software will not run. The
processor
> works as it runs other software testing out parts of the board.
However when
> I run the following code sequence:
>
>
>
> PINSEL2 = 0x10151105; /* selects P1[0,1,4,6,8,9,10,14]
*/
>
> PINSEL3 = 0x00000005; /* selects P1[17:16] */
>
> /* turn on the ethernet MAC clock in PCONP, bit 30 */
>
> PCONP |= PCONP_EMAC_CLOCK;
>
> delayMs(1); /* Wait 1 ms */
>
> /* write the MAC config registers */
>
> MAC_MAC1 = 0xCF00; /* [15],[14],[11:8] -> soft resets all MAC
internal
> modules */
>
> MAC_COMMAND = 0x0038; /* reset all datapaths and host
registers
> */
>
>
>
> delayMs(1); /* Wait 1 ms */
>
> MAC_MAC1 = 0x00; /* deassert all of the above soft
resets in
> MAC1 */
>
>
>
> I never get past the final line accessing MAC_MAC1. After the store
> instruction removing the reset the processor freezes and won't
even let me
> access it through JTAG (making me debug by blinking LEDs the code
for that
> removed from the above example). The only way to get it back under
my
> control is to reflash the device. If I run any other of my test
code
> everything is fine. Reading through the assembly has not revealed
anything
> strange going on only the mov, str and bl instructions you'd
expect. I am
> using the Yagarto GCC distribution, but I have used that and my
setup for
> other ARM projects before.
>
>
>
> Question: Is there anything obvious to other people on this list
that I
> should do differently to initialize the Ethernet MAC? Or in
general have any
> suggestions on this topic?
>
>
>
> Best regards
>
> Mikael
>
> Software Engineer @ IO-Connect
>
>
>
>
>



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