Multi-EMAC on TMDXEVM6472 with NDK

Yann Leclerc

Hello all,

I'm developing a raw ethernet application on TMDXEVM6472 evaluation board. To do so, I'm using DSP/BIOS5.41 and the NDK on CCSv4.

The overall architecture should be as follow:

Core 0 of DSP should run DSP/BIOS with three tasks : one to receive Ethernet packets through EMAC0, one to send Ethernet packets through EMAC1, another one to route packets between DSP's cores.

Starting from the demo project, I was able to use one EMAC at a time (EMAC0 or EMAC1, by setting PORT_USED constant in ethdriver.c), to send or receive packets sequentially (i.e. not simultaneously using a receive task and a send task).

So, my questions are :

-Does NDK make use of both EMAC0 and EMAC1 on the same core (or on two different cores) possible? If the answer is yes how?

-If not, is it possible to use one EMAC to send and receive packets simultaneously (with two different tasks)?

-If NDK doesn't cope with multi-EMAC, is there another way to manage raw ethernet packets with multi-EMAC?

Thanks in advance for your answers!

Best regards,

Yann

over 14 years ago

0 ArunMani over 14 years ago

TI__Genius 9915 points

NO We cannot do multi-emac transmit and receive using the NDK framework. But you can use one EMAC and have send and receive packets using different tasks, but you have to make sure that there are portion of the code that has to be protected since it is shared by both transmit and receive. You can also use EMAC lld for handle multi-emac usage. Infact the emac-lld has a example using both the emacs at the same time. You can get the EMAC lld from the MCSDK package. the Link for the MCSDK1.0 is given below.

http://focus.ti.com/docs/toolsw/folders/print/bioslinuxmcsdk.html

Thanks,

Arun.

0 Yann Leclerc over 14 years ago in reply to ArunMani

Prodigy 20 points

Thanks for your answer. I'll try to use EMAC lld with MCSDK.

Yann

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Multi-EMAC on TMDXEVM6472 with NDK