Inconsistent ethernet on TM4C129ENCPDT

Furthermore, I've compiled the udpEcho_TivaTM4C129XNCZAD example and programmed a Texas Instruments TM4C129XNCZAD development board and it exhibits the same behavior. The ethernet is hit or miss on sending out packets...

To rule out any other strange network activity I've taken the board off the corporate network and used a consumer grade Netgear router as the DHCP server with nothing else on the network and the same behavior occurs.

Some help on this would be appreciated.

Mike,

We're trying to reproduce the problem on our end.

Judah

Hi Judah,

Thanks for looking into this. I also tried the "enet_lwip" (non-rtos) example on my dev board and it does not exhibit the issue. If you're having trouble reproducing it maybe you could debug it remotely?

Mike

Mike,

I am assuming those inconsistencies happen while debugging the code. The following thread deals with similar issues and the solution seems quite simple: guarantee a reset at every connection and restart. Since this is a fairly simple approach, I would recommend following it to at least help us better understand the problem.

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/316375.aspx?pi297168=2

Lenio Cacula said:

Mike,

I am assuming those inconsistencies happen while debugging the code. The following thread deals with similar issues and the solution seems quite simple: guarantee a reset at every connection and restart. Since this is a fairly simple approach, I would recommend following it to at least help us better understand the problem.

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/316375.aspx?pi297168=2

Lenio,

Thank you for the suggestion, but I can reproduce the problem without connecting the JTAG. I can reproduce the problem by just powering the development board through the USB connector without a connection through CCS.

Hi Mike,

We've reproduced the problem and are trying to figure out the root cause. I'll let you know more when we get more information.

Todd

Todd,

Just want to refer you over to this other thread where there seem to be some hardware differences between my board that works and the customer board that doesn't.  I'm not sure if this is a significant finding.

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/p/316375/1127461.aspx#1127461

Thanks,

Stuart

Hi,

I'm working on a new project and I plain to use the Tiva MCU. But ethernet connexion is very important for my developpment and i would like to know if there is an issue to this dhcp issue ?

We are still trying to get to the root cause.

Todd

Hi Todd

Just wondering how you are going with this.  I am in the process of testing a new board of mine with TM4C129ENCPDT processor. I found I was getting a DHCP error aso went and tested the original TCPEcho demo on the TM42C129 Dev kit, same issue.

Then tries static IP, this also failed but when I disconnected from the Debug interface the static IP worked.

Tried the same on my board and it also worked without the Debug interface but not with the ICD interface.

In the process of developing this new board for new product so really need a solution or maybe need to look for LWIP demo with TIRTOS so I can at least continue testing my PCB.

Todd

I've also been fighting this issue on 2 different TM4C129x boards while running some of the example programs using the latest versions of everything available.  I've also seen this issue on the LaunchPad board as well.  If there is any more info you need, let me know.  This is an irritating problem because it can take quite a few restarts of the code to get it to take off so new changes can be tested. 

Does this also apply to the tirtos_tivac_2_00_01_23 implementation?

I notice that the EMACSnow.c file already has 

UInt32 ui32FlashConf;

and

/*
* read modify write the FLASH CONF bits. Turns ON the prefetch buffer.
*/
ui32FlashConf = HWREG(0x400FDFC8);
ui32FlashConf &= ~(0x00010000);
ui32FlashConf |= 0x00020000;
HWREG(0x400FDFC8) = ui32FlashConf;

in the EMACSnow_NIMUInit function

Yes the modifications need to be done for TI-RTOS for TivaC 2.00.01  release as well.

Regards,

-- Emmanuel

Thanks

Please follow the instructions on step 0 on the wiki page.