Roman Mashak wrote:
> Hello,
>
> I'm working on the bootloader, which is supposed to load image via USB.
> It is AT91SAM7S256-based product. I've read Atmel's documentation and
> reviewed the accompanied code.
>
> So to test firmware I need to impement a simple user application (i.e.
> Win32) to upload the image.

>I don't quite understand how to split the
> image in to equal chunks, which will be sent over USB.
What is the driver you used on the USB ? CDC ?

You read a 256Byts and split them to the maximum size of the EP. I think
is 64 on SAM7 parts.

>
> As I understood Atmel's documentation, only whole pages are burnt on
> flash, i.e.
I need to prepare set of chunks with size of page, correct?
Yeah your right.

> But image size doesn't necessary be multiple, so there would be some
> little piece remained.

The little piece remained will be filled with 0x00 or 0xff or anything
else. It doesn't matter.

>
> Are there any ideas about that?
>
> Thanks.

Hope this help

Jonathan

Jonathan Dumaresq wrote:

Thank you for your feedback.
Sorry for such a late reply. Things kept me busy.

> What is the driver you used on the USB ? CDC ?

Correct. I use CDC example form Atmel.

>
> You read a 256Byts and split them to the maximum size of the EP. I think
> is 64 on SAM7 parts.

I don't quite understand here. Why do I read 256bytes and then divide to
the page size? What is EP, to be precise?

>
>>
>> As I understood Atmel's documentation, only whole pages are burnt on
>> flash, i.e.
> I need to prepare set of chunks with size of page, correct?
> Yeah your right.

Is it necessary to prepend every chunk with some header? I mean what is
the way to specify the first or last chunk in the stream?