Checksum exclude section

[AnkitaP]

Hi team,

I wish to write a 2 byte bootloader version in the checksum exclude section. I changed the size to 2 bytes in the Bootloadable component's - Checksum exclude section size.

I would like to modify this data while the device is in bootloader mode and do not want it to cause any checksum failure. How can I avoid this?

Also according to the data sheet:

Note: Do not use Bootloader commands “Send Data” and “Program Row” to update this section.

Then what method can I use to write to the 2 bytes in the checksum exclude section from the Bootloader project?

Thanks,

Ankita 

[Alakananda_BG]

Hi Anikta,

I have attached a project where you can store 2 bytes in the checksum exclude region.

For that you need to set the checksum exclude section sie as 1 row = 256 bytes(depends on device used)

Please let us know if the attached project helps to solve your query.

Regards

[AnkitaP]

Thank you Alakananda. 

Will the bootloadable code be able to overwrite this checksum exclude section? 

I'm worried if the flash size used by the bootloadable is at capacity (around 95%) will it start overwriting this region?

[Alakananda_BG]

I'm worried if the flash size used by the bootloadable is at capacity (around 95%) will it start overwriting this region?

No it wont start overwriting.

If you feel your bootloadable size is high you can keep chescksum exclude region size as 10 bytes.

Regards

[AnkitaP]

Hi Alakananda,

I read somewhere in the documentation that we should set the checksum exclude size in bytes the same as the size of the row for the device. 

How can I insert 10 bytes if my row size is 256 bytes? 
Also if I set the checksum exclude size to 10 bytes, I wont be able to use CyWriteRowData() right?
What else can I use to write to the address then? 

Thanks for your prompt responses 🙂