LLAMA - Low Lag Amazing MiSTer Adapter
This is an open-source / open-hardware controllers adapter for MiSTer FPGA.
Supported outputs are both USB (XInput) and MiSTer's LLAPI interface.
32U4 module designs include gerber files and SeeedStudio BOM file for Fusion PCB Assembly service.
LLAMA currently supports original controllers for the systems below:
| Latency Measurements - 1000Hz USB polling mode | Controller | Samples | Average | Max | Min | Std Dev |
|---|---|---|---|---|---|---|
| LLAMA USB | 2000 | 1.6996ms | 2.224ms | 1.188ms | 0.289ms |
Button Mapping
It's possible to map buttons for each supported joystick. Button mapping is done based on an index that maps to buttons of the internal abstract pad (XInput-like).
Mapping is fully customized by the user. Planning your mapping can be done with the help of the mapper/LLAMA Mapping.xlsx spreadsheet. Change the buttons of the supported pads in the "Input" area by selecting them from list boxes. You can see how those mappings affect output for XInput (USB) and also LLAPI cores by checking the "Output" area of the spreadsheet.
After setting the mappings in the spreadsheet, simply use the numbers inside
parenthesis for each button of each controller in the <profile> section of
the mapper/map.xml file. There are two profiles per controller. You just
apply the numbers at the same order they read from the spreadsheet to the
chosen controller profile.
After finishing the changes inside mapper/map.xml file, run the mapper/mapper.py application (tested only on Python 2.7).
cd mapper
python mapper.pyYou should probably need to install intelhex package via pip beforehand.
pip install intelhex
The above will convert map.xml to a file named map.eep. This should be flashed into AVR's EEPROM like this:
dfu-programmer atmega32u4 flash --eeprom map.eep --force
Mapping is not mandatory. The firmware will save the defaults to EEPROM by itself the first time it runs if no valid mapping/config is found.
Each controller has two mapping profiles. Below you can find the button combination on each controller that will switch mapping profiles:
NeoGeo: Down + Start + B
NES: Down + Start + A
SNES: Down + Start + A
Saturn: Down + Start + C
TG16/PCE: Down + Start + I
Genesis: Down + Start + C
Licensing:
Disclaimer:
The firmware source code made available here is an original creation by Bruno Freitas.
The AVR ASM/C implementation of the LLAPI "slave" interface presented here was created from scratch by Bruno Freitas. MiSTer's LLAPI "master" interface protocol described here in SystemVerilog has been used as documentation and reference only.
No source code from third parties has been used used by this project.
No reverse-engineering has been done against commercial and non-commercial products during the development of this project.