Flash erase issue TM4C129ENCPDT

Barry Andrews

I have an issue using the FlashErase function to erase a block of flash in my TM4CENCPDT processor.

Program is loaded from CCS V5.5. using Stellaris ICDI and runs fine till I do the FlashErase.

My code calls FlashErase(0x00003C00) and immediately after this the debugger just stops at Reading 0xFFFFFFFE

Dissassembly view in CCS shows "Memory map prevented reading 0xFFFFFFFE [code=0x20000]"

The block I am erasing is a valid 1024byte block start and the code I am running at the time is definitely not in the same block.

Any suggestion would be appreciated.

over 11 years ago

0 Amit Ashara over 11 years ago

TI__Guru**** 244400 points

Hello Barry,

Where do you see the 0xFFFFFFFE in CCS? Is this in the CPU registers?

If possible can you send the CCS project and I can give it a quick try?

Regards

Amit

0 Barry Andrews over 11 years ago in reply to Amit Ashara

Genius 3460 points

Sorry for delay in responding, away for work.

Attached is the project, 0xFFFFFFFE appears in the main window of CCS Studio, not in the registers view.

2450.RM3118_TIVA_BOOT.zip

0 Amit Ashara over 11 years ago in reply to Barry Andrews

TI__Guru**** 244400 points

Hello Barry

Will check it out in the next few days and see what the issue is

Regards

Amit

0 Barry Andrews over 11 years ago in reply to Amit Ashara

Genius 3460 points

Hello Amit

Any update on this?

Barry

0 Amit Ashara over 11 years ago in reply to Barry Andrews

TI__Guru**** 244400 points

Hello Barry,

The Flash Erase of 0x3C00 would mean that Flash Locations from 0x0 to 0x3FFC will be erased. Even though the Bank Sector is 8KB, the banks are in interleaved mode (always) and hence an erase would actually cause two banks sector's to be erased.

Regards

Amit

0 Barry Andrews over 11 years ago in reply to Amit Ashara

Genius 3460 points

Thanks, that explains a lot, now just have to modify my code to take this into account.

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Flash erase issue TM4C129ENCPDT