I need to send data from an mcu to the PC serial and/or ps/2 port as a mouse. The mcu will emulate a pc mouse by sending left/right up/down signals to the PC.

I can't find info on the mouse protocol. All I found is a data receive and clock line. Has anyone done this before and/or know where I can find the info? I've searched the web for hours only to find nothing.

Thanks.