"Hi all,
This is my PowerShot code for USB Host Shield:
 
Announcement -> http://www.circuitsathome.com/mcu/controlling-canon-powershot-camer...
Description -> http://www.circuitsathome.com/using-ptp-library-with-canon-powersho...
Code ->…"

"@Sandro - now I understand which pads you are talking about :-). I always include them to make rearranging pins easier. I have those pads on my full size usb host shields as well."

"I placed double pads (AKA solder jumper pads) on rev.1.1 board for convenience. It basically shows you where to cut the trace. You can cut traces on rev.1.0 board also.

SPI is simple. If you need to change SS pin for the USB host shield, there is a…"

"Hi! This is Oleg from Circuits At Home. If you have any questions about USB code, let me know - I'll be glad to help. As far as SPI goes, I found it easier to have SPI transfers implemented inside the class which communicates with the chip (MAX3421E…"