CSR, device firmware upgrade problem

[Boki]

Hi All,

This is for CSR, device firmware upgrade problem:

1. In most case, it seems we don't have to update boot loader, right ? so, I
can implement H4 for easier.
2. I am a little confusing, we just do a upgrade, DFU not like the FLASH rom
upgrade, just read and write.

I mean, in my imaginings, it should like below:

===> DFU mode.
===> DFU_UPLOAD
===>DFU_UPLOAD_DATA
<===OK
===>DFU_UPLOAD_DATA
<===OK
....repeat
==>DFU_RESET
<===OK

but, according to the DFU protocol, wow, timing?, it seems very complicated?

3. If I want to upgrade by H4, should I read USBDFU to complete this
project?



Thank you so much for your help.

Best regards,
Boki.