TMS570LS3137: EMAC TX Descriptor and DMA

daniel becerra

Part Number: TMS570LS3137
Other Parts Discussed in Thread: HALCOGEN, TMS570LC4357

Tool/software:

Hi all,

It looks like the first iteration completes, but nothing is transmitted—TXEN and TXDATA stay inactive. On the second iteration, it gets stuck in an infinite loop at:

while (EMAC_BUF_DESC_EOQ != (curr_bd->flags_pktlen & EMAC_BUF_DESC_EOQ));

I'm using the EMAC generated by HALCoGen. The MII pins are configured correctly, since reception works perfectly. The problem is only with transmission.

Also, I noticed I had to use little-endian for the descriptors, even though the microcontroller is big-endian. Previously, I was working with a TMS570LC43 using big-endian and everything worked. On this one, transmission only works with little-endian. Does that make sense? Any suggestions on how to make the transmission work?

Best regards,

Daniel

2 months ago

0 jagadish gundavarapu 2 months ago

TI__Guru 70211 points

Hi Daniel,

Apologies for the delayed response.

We have tested and working LwIP ethernet examples in below link:

(+) [FAQ] TMS570LC4357: Examples and Demos available for Hercules Controllers (E.g. TMS570x, RM57x and RM46x etc) - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Did you get a chance to refer and compare your code with them once?

--
Thanks & regards,
Jagadish.

0 daniel becerra 2 months ago in reply to jagadish gundavarapu

Prodigy 30 points

Hi, thanks for your answer.

- Why don't you use the EMACTransmit or EMACHWInit functions from the autogenerated emac.c and use a custom hdkif?
- I use a different phy (custom board), halcogen does not let me choose custom phy unlike other versions as in the tms570lc43457?
- I understand that in this case you don't have to use the big endian functions unlike the tms570lc4357?
- The example mentioned is the tms570ls3137zwt in my case I have the tms570ls3137pge is there any example for the pge or just change the pins?

Best regards,

0 jagadish gundavarapu 2 months ago in reply to daniel becerra

TI__Guru 70211 points

Hi Daniel,

Apologies for the delay,

I didn't get any time to work on this issue in last week, can you please just confirm whether you still stuck with this issue or not?

Thanks & regards,
Jagadish.