CCSTUDIO-C2000: Question about hex2000

Green Deng

Part Number: CCSTUDIO-C2000

Dear team:

My customer generated a .hex file use hex2000, but he has some doubts about the format of hex file:

:047FF600007F55E3D0
:00000001FF

The above is the last second line of the hex file generated by CCS, Does this line of code mean to write 0x003F4FCA in 0x3F7FF6 address?

If yes, 0x3F7FF6 is the address of CodeStart. What is 0x003F4FCA mean?

Best regards

over 3 years ago

0 Ki over 3 years ago

TI__Guru**** 464431 points

Hello,

Please see the below link for more details on the format:

https://en.wikipedia.org/wiki/Intel_HEX

Green Deng said:
:047FF600007F55E3D0

: = start code

04 = number of bytes for the data (4)

7FF6 = address

00 = record type is "data"

007F55E3 = actual data (4 bytes)

D0 = checksum

Green Deng said:
:00000001FF

: = start code

00 = no data

0000 = address (always "0000" for "end of file")

01 = This means this line represents "end of file"

FF = checksum

Thanks

0 user4612577 over 3 years ago in reply to Ki

Prodigy 50 points

Hi,

I already know the means of these two lines now, but I have a doubts of this line below.

:047FF600007F55E3D0

I believe this line is specifying the entrance of the whole program, because I find the address of the function main_init which is defined in codestart to initialize the global variable is 0x3F55E3 when I run my code online.

But the hex file above is 0x7F55E3, am I wrong?

If I am wrong, please tell me what does mean by 0x007F55E3? And why write 0x007F55E3 in 0x003F7FF6 which is the address of codestart?

Thanks

HJC

0 Ki over 3 years ago in reply to user4612577

TI__Guru**** 464431 points

I can not explain why the contents of the hex file are what they are, only how to interpret the format.

I will bring this thread to the attention of the device experts. They should be able to assist further.

Thanks

0 user4612577 over 3 years ago in reply to Ki

Prodigy 50 points

Ok ki, looking forward to your reply.

Thanks

HJC

0 Anu Biradar over 3 years ago in reply to user4612577

TI__Expert 5630 points

Can you share the code snippet of the code_start section you are referring to?

0 user4612577 over 3 years ago in reply to Anu Biradar

Prodigy 50 points

The address of _main_init is 0x3F55E3

0 Anu Biradar over 3 years ago in reply to user4612577

TI__Expert 5630 points

This is likely the LB instruction being converted to the Intel HEX format.

The C28x CPU and Instruction set is linked here: https://www.ti.com/lit/ug/spru430f/spru430f.pdf

Please check page 217.

Thanks,

Anu

0 user4612577 over 3 years ago in reply to Anu Biradar

Prodigy 50 points

Ok! I see! Thanks for your help!

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CCSTUDIO-C2000: Question about hex2000