TMS320F280049C: The length of write bite

Kailun Liu

Expert 4123 points

Part Number: TMS320F280049C
Other Parts Discussed in Thread: C2000WARE

Hi team,

Could you pls help on this? Our customer has some questions about F280049C.

Background:

My original bootloader is based on the architecture of 28035 and 2806, every time I write flash, it is 1 BYTE write.

When I used TMS320280049C for BOOTLOADER, The example shows in the TI software library is: When writing to FLASH, it is written in a group of 8 BYTE.
I looked at the manual and 280049 flash minimum write is 4 bytes.

My question is:

What if 280049 write 4 BYTE at a time, but the HEX2000 .exe convert from .out file to .A00 file cannot meet 4 bytes as a group? What about the last set of data groups with less than 4 bytes?

Besides, I also want to check if I could write 1 BYTE per time? So that I don't need to change the software architecture.

Thanks and look for your reply!

over 3 years ago

0 Kailun Liu over 3 years ago

TI__Expert 4123 points

Hi team,

Could you please help on this?

0 Kailun Liu over 3 years ago in reply to Kailun Liu

TI__Expert 4123 points

Hi team,

Could you please help on this?Thanks!

0 Kailun Liu over 3 years ago in reply to Kailun Liu

TI__Expert 4123 points

Hi team,

Could anyone help on this? Thanks!

+1 Vamsi Gudivada over 3 years ago in reply to Kailun Liu

TI__Guru* 87155 points

Hi Kailun Liu,

Sorry for the delay. Today, we were asked to take a look at this post.

Please search for Why do you use align directive (ALIGN(x)) in the linker cmd files provided in the C2000Ware examples? in this FAQ: https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/951658/faq-faq-for-flash-ecc-usage-in-c2000-devices---includes-ecc-test-mode-linker-ecc-options

On this F28004x device, it is not allowed to program 1 word at-a-time. There are two reasons for this:

1) You should not give more than 2 program commands for a given 128-bit aligned memory. This limitation comes from the flash technology used on this device. Hence, you need to program either 64-bits (four 16-bit words) or 128-bits (eight 16-bit words) at-a-time.

2) On this device, flash has ECC. Each 64-bits (aligned) of the flash main array has a corresponding 8-bit ECC space. If you program partial data (< 64-bits) along with ECC, you will not be able to program the remaining bits in that 64-bit slice later (without an erase) since the ECC is already programmed for it. Hence, you need to program either 64-bits (four 16-bit words) or 128-bits at-a-time (eight 16-bit words). Reason we suggest 128-bits is that the flash wrapper supports programming 128-bits at-a-time; hence you can take that advantage.

Other FAQ that can help: Flash API usage for C2000 devices: https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/951668

Thanks and regards,

Vamsi

0 Vamsi Gudivada over 3 years ago in reply to Vamsi Gudivada

TI__Guru* 87155 points

Hi Kailun Liu,

Please note that E2E will not be available (down for maintenance) for the next two days. Hence, if you need further guidance on this topic, you can discuss with me offline over email.

I will not be able to review the E2E forum up to Monday (August 21st).

Thanks and regards,

Vamsi

0 Kailun Liu over 3 years ago in reply to Vamsi Gudivada

TI__Expert 4123 points

Hi Vamsi

Thanks for your detailed reply!

Do you mean that the HEX2000 .exe convert from .out file to .A00 file can always meet 4 bytes as a group?

Could you further explain

"If you program partial data (< 64-bits) along with ECC, you will not be able to program the remaining bits in that 64-bit slice later (without an erase) since the ECC is already programmed for it."?

Thanks!

0 Vamsi Gudivada over 3 years ago in reply to Kailun Liu

TI__Guru* 87155 points

Hi Kailun,

A) For your ECC question, please go through the following and let us know if you have further questions:

1) TRM's section 3.12.10 Error Correction Code (ECC) Protection

2) [FAQ] FAQ on Flash API usage for C2000 devices:

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/951668

3. [FAQ] FAQ for Flash ECC usage in C2000 devices

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/951658

B) For your hex tool question, I suggest you to open a separate post with the compiler team.

Thanks and regards,

Vamsi

0 Vamsi Gudivada over 2 years ago in reply to Vamsi Gudivada

TI__Guru* 87155 points

Hi Kailun,

Did those references help you find the answer?

Can I close this post?

Thanks and regards,
Vamsi

0 Kailun Liu over 2 years ago in reply to Vamsi Gudivada

TI__Expert 4123 points

Hi Vamsi,

Thanks for your support, these references help a lot!

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049C: The length of write bite