TMS570LC4357: Data transmission through MibSPI to another TMS570LC4357

Trivedi

Part Number: TMS570LC4357

TI Team,

I'm using LaunchXL2 (TMS570LC4357) to receive data over Ethernet and for that I'm using LWIP. I'm able to successfully receive data over UDP and transmit the received data to another IP address using LWIP. The received Ethernet packet size is 1316 bytes and I can see each value by using variable of type structure pBUF. Now, I want to transmit this data (all 1316 bytes) using MibSPI.

I can access each byte group through the variable p->payload (where p is a pbuf structure variable). Similarly I can access all the remaining bytes through p->payload->payload and so on.

The question here is, how do I transmit this entire Ethernet packet using MibSPI as the max buffer size is 256 bytes. Can someone please guide me?

P.S.: I've already implemented MibSPI loopback of 256 bytes.

Thanks,

Trivedi

over 2 years ago

0 jagadish gundavarapu over 2 years ago

TI__Guru 69871 points

Hi Trivedi,

There is a Ethernet bootloader example which is built on UDP protocol using lwip. You can use this as a reference for your design.

Download it from below link:

1.1.0 « ActiveWebserver « Application - hercules_examples/hercules_examples - Software Examples for Hercules Processors

Path for application:

..\hercules_examples\Application\Hercules_Ethernet_Bootloader\LAUNCHXL2-TMS570LC43x

If you refer above example

Here they are giving one call back function called "TFTPRecv" to the "udp_recv" function. So, whenever a proper UDP datagram received this call back function will be called.

If we see the definition of the function TFTPRecv

Here we will have a pointer to the Pbuf and using that pointer we will process the data in this function and once the processing completed, we will free the pbuf of corresponding datagram using pbuf_free.

So, similarly in the place of this "TFTPRecv" function, you can create one SPI packet processing function and you can process the received SPI packet over ethernet and you can forward that packet to the SPI peripheral and once you completed that operation you can free the pbuf of corresponding datagram.

Thanks & regards,
Jagadish.

0 Trivedi over 2 years ago in reply to jagadish gundavarapu

Intellectual 280 points

Hello Jagdish,

I'll try to incorporate as you're suggesting. Can you please tell me how do I download this file?

Trivedi

0 jagadish gundavarapu over 2 years ago in reply to Trivedi

TI__Guru 69871 points

Hi Trivedi,

Here it is:

4213.Hercules_Ethernet_Bootloader.zip

Thanks & regards,
Jagadish.

0 Trivedi over 2 years ago in reply to jagadish gundavarapu

Intellectual 280 points

Thanks for the prompt response Jagadish. I'll look into this and get back to you at the earliest.

Along with this, do you have any reference available where UDP protocol (Ethernet Loopback) have been implemented on TMS570LV4357 using FreeRTOS? Much like what I've implemented using LWIP!

Regards,

Trivedi

0 jagadish gundavarapu over 2 years ago in reply to Trivedi

TI__Guru 69871 points

Hi Trivedi,

I have to check with internal team on this.

Regards,
Jagadish.

0 Trivedi over 2 years ago in reply to jagadish gundavarapu

Intellectual 280 points

Okay, I'll wait for your response.

Thanks,

Trivedi

0 jagadish gundavarapu over 2 years ago in reply to Trivedi

TI__Guru 69871 points

Apologies for the delay Trivedi.

Trivedi said:
UDP protocol (Ethernet Loopback) have been implemented on TMS570LV4357 using FreeRTOS? Much like what I've implemented using LWIP!

We don't have any UDP example using RTOS on TMS570LS4357 from TI side.

In below thread one customer comes-up with the UDP example built by himself, if you want you can refer it once

(+) CCS/TMS570LC4357: TMS570LC4357 FreeRTOS + lwIP Project Error - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Thanks & regards,
Jagadish.