Changeset 703832c in avrstuff for grip2hid/README.md

Timestamp:

Sep 26, 2021, 10:16:19 AM (3 years ago)

Author:

Adrien Destugues <pulkomandy@…>

Branches:

main

Children:

e545350

Parents:

81b8d53

Message:

GrIP2HID: actually do HID (using the LUFA USB stack)

File:

• grip2hid/README.md (modified) (1 diff)

grip2hid/README.md

@@ -11 +11 @@
 (2 gameports, each allowing to use 2 gamepads thanks to Gravis chaining system).
 
+The gamepads are each reported as a separate USB report, and show up as 4 independant
+gamepads on both Windows and Haiku. Buttons are assigned in this order:
+green, yellow, red, blue, L1, R1, start, select, R2, L2. This order is reasonable
+(but not perfect) while allowing to reuse the bits received from the gamepad almost
+directly to fill the HID report. The only change needed is inverting the Y axis,
+because USB wants the up direction to be lowest values.
+
 It is powered by an AT90USB AVR microcontroller, because these implement USB in
-hardware and have easily usable external interupts (PCINT) making it much easier
-to implement the protocol (this helps because the gamepad is the master and
-drives the clock).
+hardware and make it easy to implement an HID device.
+
+You need the LUFA USB stack to compile this project. I am not including it to
+avoid code duplication. Download and extract it yourself, or set the LUFA_PATH variable
+to where you already have it when compiling.
 
 [Further reading on GrIP](http://pulkomandy.tk/_/_Electronique/_Gravis%20Interface%20Protocol)