TMS320F28075: Lock Up on Reset

Lance Hummel

Hey all,

I'm running into an issue when resetting the microcontroller. I have enabled a soft reset using the watchdog timer. In my code I initialize the watchdog and service it until an external command is sent via I2C from another processor. At that point the WD timer expires the processor resets. In some cases however it appears that the processor is locking up. The device is configured to use a boot ROM and pull code from a EEPROM connected via I2C. I was under the impression the watchdog will do a full reset on the processor and clear the RAM and by necessity start the boot ROM processor over again. Is there any case where the processor could be executing code from the wrong address? I'm scratching my head at this point because it works some times and others it doesn't.

Lance Hummel

over 9 years ago

0 Vivek Singh over 9 years ago

TI__Guru** 116081 points

Hi,

Your understanding is correct. After WD reset, BOOTROM code will run and RAMs will be cleared and based on BOOT MODE, CPU will jump to application code.

What do you mean by "processor is locking up" ? Does it not jump to application from BOOTROM code? Or it jumps to application but does not run the application as expected? When it fails, do you see XRSn pin toggling continuously?

Regards,

Vivek Singh

0 Vivek Singh over 9 years ago in reply to Vivek Singh

TI__Guru** 116081 points

Is this issue resolved? If not, please let me know the answer to the questions in my last post.

0 Lance Hummel over 9 years ago in reply to Vivek Singh

Intellectual 960 points

It ended up being an issue where another device on the I2C bus was pulling the CLK line low in some cases when it wasn't supposed to. I made a change to the board the micro is on and the issue has been fixed. Everything was working as described.

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TMS320F28075: Lock Up on Reset