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项目作者： denilsonsa

项目描述 ：
My changes on top of RetroAdapter to make it work with my microcontroller. This is basically the RetroAdapter version 2.1a with some tweaks in the Makefile, an updated usbdrv, and many modules disabled. Background: For a long while I wanted to build a Sega Mega Drive controller adapter to USB. Fortunately, Paul Qureshi wrote have created RetroAdapter and published all the source and schematics on his website . This adapter uses an ATmega 8-bit microcontroller with almost no extra components (only a few resistors, a few capacitors, a couple of Zener diodes, a crystal). He used ATmega168, which is more powerful than ATmega8 that I already have. In order to make it compile and make it fit in 8KB (or 6KB + bootloader), I had to make small changes to the RetroAdapter code. These changes are saved in this repository.
高级语言： C
项目地址: git://github.com/denilsonsa/retroadapter.git
创建时间： 2020-06-28T17:33:08Z
项目社区：https://github.com/denilsonsa/retroadapter
开源协议：GNU General Public License v3.0
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RetroAdapter

Originally written by Paul Qureshi (for the ATmega168 microcontroller).

Modifications in this repository by Denilson Sá (adapted to the ATmega8 microcontroller).

Overview

This repository contains my changes on top of RetroAdapter (originally for
ATmega168) to make it work with the ATmega8 microcontroller that I already had.
This is basically the RetroAdapter version 2.1a with these changes:

  • some tweaks in the Makefile,
  • an updated usbdrv,
  • some bugfixes in the main firmware (corrected some button mappings),
  • many modules disabled (because I’ll never use them, and to reduce the size of the firmware),
  • a few conditionals hardcoded (because my hardware only supports one kind of controller),
  • optional bootloader changed (or updated) from bootloadHID to USBaspLoader.

The firmware in this repository worked on the ATmega8 microcontroller.

Feel free to use this repository as a starting point for your own project.

Background

For a long while I wanted to build a Sega Mega Drive controller adapter to USB.
Fortunately, Paul Qureshi wrote have created RetroAdapter and published all the
source and schematics on his website http://denki.world3.net/retro_v2.html.
This adapter uses an ATmega 8-bit microcontroller with almost no extra
components (only a few resistors, a few capacitors, a couple of Zener diodes, a
crystal).

He used ATmega168, which is more powerful than the ATmega8 that I already have.
In order to make it compile and make it fit in 8KB (or 6KB + bootloader), I had
to make small changes to the RetroAdapter code. These changes are saved in this
repository.

The Makefile changes mostly come from my previous project:
atmega8-magnetometer-usb-mouse

My blog post about this project:
http://denilson.sa.nom.br/blog/2013-07-15/i-built-a-retroadapter

How to get started

If you’re not familiar with AVR ATmega microcontrollers, please read my
multi-part series:
First contact with ATmega8 microcontroller.
It starts from the very basics and goes step by step on building a simple
project using such microcontrollers.

Once you’re familiar with AVR ATmega microcontrollers, and you have the
necessary software tools, you can dig into this repository:

  • fuses.md - Lists what are the expected Fuse values to be
    programmed into the microcontroller.
  • hardware/ - Schematics of the original RetroAdapter and also for
    the ATmega8 version.
  • source/ - The entire source-code for the firmware and for the
    optional bootloader. Includes a Makefile which can be used
    to build the firmware, write it to the microcontroller, and also write the
    fuse bytes.
  • more_docs/ - Further documentation on the RetroAdapter, saved
    from the original website before it went offline.
  • legacy_from_RetroAdapter_2.1a/ - Other
    files originally from RetroAdapter 2.1a, before the changes from this
    repository. You probably don’t need these.