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Rasp-Retro-Games-Arcade-Control (voir la source)
Version du 9 mars 2014 à 19:57
, 9 mars 2014 à 19:57→Raccordement
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{{asm-text}} This is an example of a case I made from acrylic, but any workable material will do. '''A cigar box makes a great fit'''!
The case should be at least 50mm (2 in.) deep to accommodate the buttons and solderless connectors.
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{{asm-text}} The shelf at the top of the case holds a small USB keyboard. This is a catch-all for seldom-used functions (e.g. game start). Only the essential controls were assigned to arcade buttons. Add others if you like!
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{{asm-text}} Here’s the joystick and two buttons plugged directly into the Raspberry Pi GPIO header as previously described.
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== Un dernier élément ==
Our “retrogame” utility is the software glue that joins these keyboard-driven games to our GPIO-connected controls.
[https://github.com/adafruit/Adafruit-Retrogame Download retrogame from GitHub]. Select the “download ZIP” button and uncompress this file on your Raspberry Pi.
'''A pre-built version of retrogame is included in the ZIP file. If using the joystick and button layout described above, this program can be used as-is'''. Otherwise, the C source code needs some editing, and you’ll need to compile it (a Makefile is provided) after making changes. The GPIO pin to keyboard remapping is currently handled with a table in the source…this should be edited to match your unique wiring setup.
<nowiki>cd Adafruit-Retrogame
nano retrogame.c</nowiki>
(Of course you can substitute your editor of preference there — “nano” is easier for beginners.)
Starting around line 77 you’ll see a table resembling this:
<nowiki>struct {
int pin;
int key;
} io[] = {
// Input Output (from /usr/include/linux/input.h)
{ 25, KEY_LEFT },
{ 9, KEY_RIGHT },
{ 10, KEY_UP },
{ 17, KEY_DOWN },
{ 23, KEY_LEFTCTRL },
{ 7, KEY_LEFTALT }
};</nowiki>
Each line in this table contains two elements. The first is a GPIO pin number (where a button or one direction from a joystick is attached), the second is the corresponding key code to be generated by this control. A list of valid key code names can be found in the file /usr/include/linux/input.h starting around line 178. Remember to enclose each pin/key pair in {curly braces} with a comma between them.
'''By default, the code is set up to match our example “no solder” controller wiring. This also works directly with the standard MAME controls. So you might not need to change anything; the pre-built version may have you covered.'''
If you need an extra ground pin (and have extra GPIO pins available that you’re not using for controls), set the key code to GND instead.
Write your changes to the file and exit the editor, then type:
<nowiki>make</nowiki>
This should build the executable '''retrogame''' utility. If you instead get an error message, there’s a problem in the edited table — most likely a missing curly brace, comma or semicolon.
'''But wait'''...we’re not ready to run yet! Retrogame requires the uinput kernel module. This is already present on the system but isn’t enabled by default. For testing, you can type:
<nowiki>sudo modprobe uinput</nowiki>
To make this '''persistent between reboots''', append a line to /etc/modules:
<nowiki>sudo sh -c 'echo uinput >> /etc/modules'</nowiki>
'''Now''' we’re in good shape to test it!
Retrogame needs to be run as root, i.e.:
<nowiki>sudo ./retrogame</nowiki>
Give it a try. If it seems to be working, press control+C to stop the program and we’ll then set up the system to launch this automatically in the background at startup.
<nowiki>sudo nano /etc/rc.local</nowiki>
Before the final “exit 0” line, insert this line:
<nowiki>/home/pi/Adafruit-Retrogame/retrogame &</nowiki>
If you placed the software in a different location, this line should be changed accordingly. “sudo” isn’t necessary here because the rc.local script is already run as root.
Reboot the system to test the startup function:
<nowiki>sudo reboot</nowiki>
The software will now be patiently waiting in the background, ready for use with any emulators.
Each emulator will have its own method for configuring keyboard input. Set them up so the keys match your controller outputs. Up/down/left/right from the arrow keys is a pretty common default among these programs, but the rest will usually require some tweaking.
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