Pi Zero W GBA [BUILD]
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@moosepr
Okay cool, thanks I'll try it out. -
@moosepr
The resolution is defaulted at 720x480, which is probably why it looks bad, I'm going to go into the config and change that to the actual resolution of the screen. -
@moosepr
I set it to speed=90000000 fps=60 after testing it a lot and like these settings. I was wondering what resolution settings I have to choose from that applies to this screen and not the HDMI, like, I guess this screen would be analog (I don't really know I haven't looked at the spec sheet yet). I'm just trying to set everything to 320x240 which is what the screen is. Also I'm curious about changing the overscan since it appears to be off. Will that mess anything up with this screen? -
@hex Do you have a link for a conversion tutorial? I have simply soldered the 5v input to the old output of the voltage regulator that I removed, in thoery everything after the voltage regulator is still seeinng the same voltage as before.
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@spruce_m00se Kindly create a new thread and tag me. This is getting off topic
Sent from 20,000 leagues under the sea.
Powersaver Emulation station : https://github.com/hex007/EmulationStation
ES dev script : https://github.com/hex007/es-dev/blob/master/es-tests.sh -
@hex hold on, hahahaha
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@techieandroid you only need to change over scan settings if you are getting borders round your screen.
The screen resolution is 240x320, so setting things to that will help. The fbcp will actually scale things, so as long as the aspect ratio is correct, it shouldn't look too bad. You can also change the theme, there are many that are designed to fit the smaller screens
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@moosepr
Thanks, I turned overscan off in all the configs and set the resolution everywhere I could, it made a big difference in the terminal but emulation station stayed the same even after adding it in the es config.I've almost finished my project, all I need now is to get the buttons in.
So I'm going to use the GPIO pins for them, I'll use 10 total for the GBA buttons, do I need to use any specific GPIO pins?
And where do I add the code for the buttons when they are wired in?Thanks
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@techieandroid Any one in green that isn't used by the display is fine, from the following pinout.
As for driver to use buttons on the GPIO, i used mk_arcade_joystick_rpi. Very easy to get working.
Hope to see some pics soon.
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@techieandroid i use this for gpio buttons
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I also need to remove the board from screen. There's a few resistors and capacitors, are they going to mess me up it I connect the screen solely from the ribbon cable? Also I need a schematic showing which ribbon cable pins are what, since there are untraceable.
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@techieandroid the board will have most of its components for the SD card. There will be a resistor for the backlight, and a FET/transistor to allow you to pwm backlight.
I made a simple board that it designed for 14 pin versions of the screen (2.2 inch, no touch)
https://oshpark.com/projects/BP9tGKagBut larger screens have touch, and so I designed this board
https://oshpark.com/projects/zUNmnlLFThe pads on the back are for the touch interface, which most folks don't use. I have not tested the latter board, but I see no reason why it wouldn't work.
Either board needs a smd resistor, 0805 in size, and just 10 ohms
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@techieandroid In my build I don't use the top pin, sdo(miso).
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@techieandroid my board has the led pin tied to the 3.3v to simplify things. It means you can't adjust the backlight without changing the resistor. Saves you a wire 😀
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Okay thanks guys I'll check that out. So I can't be sure but maybe the buttons on the right side ground to the same location as the a-gnd (in the pic it's at the end of the alligator clip) which I believe to be the audio ground (speaker probably). And on the left side the buttons could ground to the same spot as the ground for the cartridge. I need to know because this won't work if I cut the center out and can't ground the buttons.
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Okay I cut my miso cable and the led cable and connected the led to vcc. What was miso doing since it seems to be working fine without it? And giving the backlight 3.3v makes it look better imo. Thanks for the tips. I'm going to test around on the GBA board and see if I can locate ground.
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YES! I've found the remaining information I needed.
Button programming
https://www.raspberrypi.org/forums/viewtopic.php?f=78&t=83317&p=589292#p589292GND location
https://assemblergames.com/threads/game-boy-advance-schematic-cadsoft-eagle-files.54814/I will be completing my project tonight. :]
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