Fix corruption. NEVER use SPI method transfer on a pointer.

[xxxajk]

Should fix the problems.
Also removes duplicate code.

[gdsports]

The USBPrinter_uhs2 driver works with this patch using Uno and Leonardo. I do not have a Mega 2560 but the patch should work. Also the printer is confirmed to work on ESP8266. I will withdraw PR #470 since it is redundant.

BTW, M5Stack released a USB host MAX3421E module so I will be testing this out when I receive one. M5Stack is an ESP32 based system of stackable modules. The modules are like shields but include plastic casing so the module stack is professional looking.

https://m5stack.com/collections/m5-module/products/usb-module

[Lauszus]

Is this ready to merge?

[gdsports]

It has been working fine for me.

[Lauszus]

Thanks for the report @gdsports. I'll make a new release as well, so all the people that are using the Arduino library manager will get the update as well.

[Bacto]

Hi everyone ant thanks for this library :)
Do you have any news about the next release?
The last one is from 2018/15/03 and does not include this fix unfortunately :-/

[Vamshi253]

Hi @gdsports,

The USBPrinter_uhs2 driver is not working with this patch using Arduino Mega ADK. Could you please suggest any changes that I need to make in order to work out with Arduino Mega ADK.

Thank you