Game Input MultipleXer

I have confirmed that my FTDI will interpret 5v input no issue, so it is 5v tolerant.

Using my arduino2560, which is 5v, I was able to communicate between both devices upto 230400 bps. Above that, the arduino started spitting out garbage, but comms worked both ways with the arduino sending 5v to the ftdi and the ftdi sending 3v3 to the arduino.

This was verified with my oscilloscope which was able to decode the TTL packets no problem.

The FTDI will talk to itself at 500kbps (460800bps).

The 32u4 should see anything above about 2.8v as high anyhow.

At no point do the tx/rx lights on my 32u4 board light up.

So..

I just double checked the schematic of this board and it shows a 8mhz xtal on xtal0/xtal1..

You mentioned before that the voltage/speed was set by firmware..how is this possible when the 32u4 appears to use an external xtal?

Firmware doesn't really sets the clock, but peripherals like the UART are configured according to the clock.

I think original design by sparkfun uses a 16MHz oscillator for both 3.3V and 5V variants. Your board manufacturer probably used an 8Mhz oscillator to save money.

Sucks but my fault for not looking closer when I got it.

Found another 32u4 board at my local shop w/16mhz will grab that.

Dunno wtf I'm gonna use this one for now.. Might have to swap the xtal

Should be going to pick up a pro micro here for 10bux tonight..its a 5v 16mhz 32u4, so should work eh?

It should work fine.

And does.

Need a better mouse now for fps stuff, but my handbrake works perfect.

Thanks for the lovely software. I may contribute code one day.