the locked problem about TM4C1294

Damien Zhang

Other Parts Discussed in Thread: TM4C1294KCPDT

I have a problem about TM4C1294KCPDT. I want to use a button(link the pin of PG0) and LM Flash Programmer to program the TM4C. I press the button when power off until power on to not press the button. When I press the “program” on LM Flash Programmer, it show an error and the TM4C1294 was locked. The code as below:

I looked up the user’s guide but didn’t find any solution. I have used TM4C1231 at my previous reserch but didn’t have this problem. Is the code is wrong and how to resolve this problem?

Thanks a lot.

over 8 years ago

0 Amit Ashara over 8 years ago

TI__Guru**** 244380 points

Hello Damien,

Please see the following application note.

www.ti.com/.../spma075.pdf

It seems that the reserved bits of the BOOTCFG have been turned 0. This is a known errata on the device as well.

Regards
Amit

0 Damien Zhang over 8 years ago

TI__Intellectual 1175 points

Thanks a lot ~@^_^@~

0 Damien Zhang over 8 years ago in reply to Amit Ashara

TI__Intellectual 1175 points

I have unlocked the TM4C1294 but it will remain locked when I program it. I want to know what is causing the problem. I have set the BOOTCFG as 1 but TM4C will remain locked. I programmed the same code to TM4C1230 as the same ways but TM4C1230 can work normally. So what's the different between 1294 and 1230 in programming.

0 Amit Ashara over 8 years ago in reply to Damien Zhang

TI__Guru**** 244380 points

Hello Damien

I am not clear here. Please let me know if I read your last post correctly

1. You ran the unlock sequence. Did the the device get unlocked?
2. I think you meant it got unlock. but when you programmed the device, it again locked. Is that correct?
3. Can you check the value of the variable regVal before it is written to the device?

0 Damien Zhang over 8 years ago in reply to Amit Ashara

TI__Intellectual 1175 points

TM4C1294 got unlock but it again locked when I program it. The variable regVal I will check the value. Did you think the code in that picture have some problems? I highly doubt its correctness but I don’t know where is wrong.

Thanks a lot.

0 Amit Ashara over 8 years ago in reply to Damien Zhang

TI__Guru**** 244380 points

Hello Damien,

I already identified the issue in the first reply

"It seems that the reserved bits of the BOOTCFG have been turned 0. This is a known errata on the device as well."

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the locked problem about TM4C1294