CCS/TMS320F280049: Is "restart" after "reset" a must-do? during Emulation mode

Aki Li

Part Number: TMS320F280049
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

I found a issue during debugging F280049 (Experiment kit). The example project is C:\ti\c2000\C2000Ware_1_00_05_00\device_support\f28004x\examples\led

With debugger connected, after clicking the reset, if I click " resume" , it can not run normally and will stop at address 0x3fb02a(ESTOP0). Only if I click "restart" after "reset" , then resume, the project can work.

Then I tried to load bootrom symbol( :\ti\c2000\C2000Ware_1_00_05_00\libraries\boot_rom\f28004x\revA\rom_sources\ccs_files\cpu\Release\F28004x_ROM.out) , and run with single step mode, and found the project will stop at the "ram_zero_loop_0"( repeatedlly run in the green lines)

ram_zero_loop_0 is defined in the InitBoot(), based in cpubrom_Init_Boot.asm.

It should be note that the boot mode setup is right, since it can run normally in standalone.

Could you please give explanation on this issue?

over 5 years ago

0 Christopher Chiarella over 5 years ago

TI__Mastermind 30255 points

Hello

If you haven't configured the emulation values for say "boot to RAM", doing a reset and run will end up likely jumping to flash and getting ITRAP.
If you want to reset without configuring the emulation values, then you must do reset followed by a restart which will skip boot ROM and go straight to Main.

That ram_zero_loop is doing what is expected, it will continue to loop until ACC reaches zero.

Best regards
Chris

0 Aki Li over 5 years ago in reply to Christopher Chiarella

TI__Expert 8265 points

Thank you.

I'd like to know why it will stop at the ram_zero_loop_0, can you give further explanation for this function?

I have looked into the TRM, and found the address ranges for ITRAP ISR is 0x003FBD67 – 0x003FBDD5 , but here the address is from 0x003fc7c7, could you help comment this?

Besides, if I want to reset and run directly, I need to configure boot to RAM or boot to flash before, right?

0 Christopher Chiarella over 5 years ago in reply to Aki Li

TI__Mastermind 30255 points

Hello

It won't stop at ram_zero_loop_0, it's not an infinite loop. Maybe device is resetting and you keep seeing it at that location? You can't get it to step or run past it?

That's correct, you need to configure the GPIOs and emulation boot value accordingly.

Best regards
Chris

0 Aki Li over 5 years ago in reply to Christopher Chiarella

TI__Expert 8265 points

I run with single step, and it will run repeatedly in the green lines(within ram_zero_loop_0), and I haven't found it will run out of the loop.

0 Christopher Chiarella over 5 years ago in reply to Aki Li

TI__Mastermind 30255 points

What's the value of ACC before stepping in and what's ACC doing during your steps? Do you see it get to zero but it still keeps looping?

Best regards
Chris

0 Aki Li over 5 years ago in reply to Christopher Chiarella

TI__Expert 8265 points

Sorry, I found it actually can run out after a long time.
By the way , how can I see the ACC value?

0 Aki Li over 5 years ago in reply to Christopher Chiarella

TI__Expert 8265 points

What is the ram_zero_loop used for?

0 Christopher Chiarella over 5 years ago in reply to Aki Li

TI__Mastermind 30255 points

Yes, it does 32 loops. You can view ACC within the CCS register window under core.
ram_zero_loop initializes a small portion of the stack used by boot to zero so it is in a known state.

Best regards
Chris

0 Aki Li over 5 years ago in reply to Christopher Chiarella

TI__Expert 8265 points

Thank you for your kindly help!

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CCS/TMS320F280049: Is "restart" after "reset" a must-do? during Emulation mode