TM4C129ENCPDT: TI_RTOS- device restarts on reconnection of ethernet link

Febin Sunny

Part Number: TM4C129ENCPDT

Hey,
I'm encountering an issue where my MCU reboot when I connect it ethernet cable while it's been running for a while. The issue is present only when the ethernet link is removed, disconnecting the device from the network is not causing any issues. EMAC_isLinkUp() in emac.c is used for checking the link status, where it returns '(EMAC_config[index].fxnTablePtr->emacIsLinkUp(index));'.
These are the console message that I'm getting when the device restarts:

Service Status: DHCPC : Disabled : : 000

Service Status: DHCPC : Enabled : : 000
RET 1
Service Status: DHCPC : Enabled : Running : 000

00051.000 TcpTimeoutRexmt: Retransmit Timeout
Network Added: If-1:192.168.2.19
Service Status: DHCPC : Enabled : Running : 017

And while debugging, the Hwi section under ROV shows the error as: "Hard Fault: FORCED: BUSFAULT: IMPRECISERR". The libraries I'm using are:

tirtos_tivac_2_16_01_14,
xdctools_3_32_00_06_core,
ndk_2_25_00_09,
ns_1_11_00_10.

Anyone experienced similar issues or any idea on this?

Thanks,
Febin.

over 1 year ago

0 Charles Tsai over 1 year ago

TI__Guru**** 191486 points

Hi,

Febin Sunny said:
I'm encountering an issue where my MCU reboot when I connect it ethernet cable while it's been running for a while.

I'm not clear with your problem description. What do you mean by reboot? Is it a complete device restart/ Or it is just that the EMAC is restarting?

Febin Sunny said:
The issue is present only when the ethernet link is removed, disconnecting the device from the network is not causing any issues.

How is the ethernet link removed? Are you trying to remove the Ethernet cable intentionally?

Febin Sunny said:
And while debugging, the Hwi section under ROV shows the error as: "Hard Fault: FORCED: BUSFAULT: IMPRECISERR". The libraries I'm using are:

This could be some kind of memory corruption due to insufficient stack or heap. Have you increased the stack and heap size to see if they make a difference?

Please use the below links to troubleshoot the exceptions.

Debugging

0 Febin Sunny over 1 year ago in reply to Charles Tsai

Prodigy 50 points

Hi,
Thanks for the response, I've gone through the debugging step, and ROV is really helpful, but still I can't figure out the issue as the hardfault is only while the etherenet link is removed.

Charles Tsai said:
I'm not clear with your problem description. What do you mean by reboot? Is it a complete device restart/ Or it is just that the EMAC is restarting?

It is a complete device restart. I've added an error handler which restarts the device. The restart is happening from the hardfault exception.

Charles Tsai said:
How is the ethernet link removed? Are you trying to remove the Ethernet cable intentionally?

Yes, I'm intentionally removing the cable for testing how the device behaves while link is lost.

Charles Tsai said:
This could be some kind of memory corruption due to insufficient stack or heap. Have you increased the stack and heap size to see if they make a difference?

I've increased both heap and stack size to couple of KBs more and yet there is no change to the situation.

0 Charles Tsai over 1 year ago in reply to Febin Sunny

TI__Guru**** 191486 points

Hi,

Have you used the below post to trace the origin of the fault?

How do I trace backward to the code that caused an exception in my TI-RTOS app?

I don't know the cause to your problem. I find the below posts with similar problem that you might want to take a look. Try the suggestion in each post one at time to see which one might have helped your problem. Don't try all the suggestions at once.

https://stackoverflow.com/questions/3757289/when-is-tcp-option-so-linger-0-required

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1048358/tm4c129encpdt-ndk-2-24-03-35-on-tm4c129encpdt-http-server-parallel-chrome-requests-problem

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/513818/so_keepalive-usage?tisearch=e2e-sitesearch&keymatch=SO_KEEPALIVE#

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1203457/tm4c1294ncpdt-help-with-malloc-error-from-the-ndk/4577899?tisearch=e2e-sitesearch&keymatch=Error%252525252525252520-2083#4577899

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TM4C129ENCPDT: TI_RTOS- device restarts on reconnection of ethernet link