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    Pi Zero W GBA [BUILD]

    Scheduled Pinned Locked Moved Projects and Themes
    pi zero wgbascreenbuildwip
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    • mooseprM
      moosepr @TechieAndroid
      last edited by

      @techieandroid if you change the fbtft.config and set the speed to be 80000000 (7 zeros) and add FPS=60

      That should improve things

      want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

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      • T
        TechieAndroid @moosepr
        last edited by

        @moosepr
        Okay cool, thanks I'll try it out.

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        • T
          TechieAndroid
          last edited by

          @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.

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          • T
            TechieAndroid
            last edited by

            @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?

            mooseprM 1 Reply Last reply Reply Quote 0
            • spruce_m00seS
              spruce_m00se @Hex
              last edited by

              @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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              • HexH
                Hex
                last edited by

                @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

                spruce_m00seS 1 Reply Last reply Reply Quote 0
                • spruce_m00seS
                  spruce_m00se @Hex
                  last edited by

                  @hex hold on, hahahaha

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                  • mooseprM
                    moosepr @TechieAndroid
                    last edited by

                    @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

                    want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

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                    • T
                      TechieAndroid
                      last edited by

                      @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

                      A mooseprM 2 Replies Last reply Reply Quote 0
                      • A
                        AluLagoa @TechieAndroid
                        last edited by AluLagoa

                        @techieandroid Any one in green that isn't used by the display is fine, from the following pinout.

                        alt text

                        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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                        • mooseprM
                          moosepr @TechieAndroid
                          last edited by

                          @techieandroid i use this for gpio buttons

                          https://github.com/adafruit/Adafruit-Retrogame

                          want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

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                          • T
                            TechieAndroid
                            last edited by

                            @AluLagoa @moosepr
                            Thanks guys. I've gotten everything desoldered off the GBA board. I'm trying to find the GND on the left and right sides of the board since I'm removing the center part. I'll post pics to show what I think are the correct grounds.

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                            • T
                              TechieAndroid
                              last edited by

                              alt text
                              alt text
                              alt text

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                              • T
                                TechieAndroid
                                last edited by

                                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.

                                mooseprM 1 Reply Last reply Reply Quote 0
                                • mooseprM
                                  moosepr @TechieAndroid
                                  last edited by

                                  @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/BP9tGKag

                                  But larger screens have touch, and so I designed this board
                                  https://oshpark.com/projects/zUNmnlLF

                                  The 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

                                  want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                                  1 Reply Last reply Reply Quote 0
                                  • T
                                    TechieAndroid
                                    last edited by TechieAndroid

                                    @moosepr

                                    Thanks, but I'm not sure my screen will work with either since I'm currently using 9 pins.

                                    alt text
                                    alt text
                                    alt text

                                    A mooseprM 2 Replies Last reply Reply Quote 0
                                    • A
                                      AluLagoa @TechieAndroid
                                      last edited by

                                      @techieandroid In my build I don't use the top pin, sdo(miso).

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                                      • mooseprM
                                        moosepr @TechieAndroid
                                        last edited by

                                        @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 😀

                                        want to get a tft into your project, look no further than here https://retropie.org.uk/forum/topic/7464/ili9341-tft-screen-guide

                                        1 Reply Last reply Reply Quote 0
                                        • T
                                          TechieAndroid
                                          last edited by TechieAndroid

                                          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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                                          • T
                                            TechieAndroid
                                            last edited by TechieAndroid

                                            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.

                                            1 Reply Last reply Reply Quote 0
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