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Forum Index : Microcontroller and PC projects : PicoGAME LCD: Handheld videogame
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2150 |
I thought about using the vga keyboard with glcd picomite for buttons cos it works but full size kb, lot of space. I got a mini usb/wifi cheap fullish kb... with laser pointer but not mmbasic compatible. I'd like a way to convert vga to composite as I got some small screens that only have composite. I'm thinking of mini picomite and vga screen cheap. I have dvi from raspberry pi to vga converter but not the other way and think some are bogus. Cheap avi screens from charity shop, one is a meant to be a photo viewer, other an analogue tv. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6835 |
https://www.ebay.co.uk/b/Vga-To-Av-Cable/158840/bn_7023555634 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2150 |
Wouldn't it be nice to use these cheap mini kbs with touch mouse with mmbasic? |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2150 |
but are they passive bogus, b/w at best? any personal experience boss? edit- I meant with mmbasic. I searched for circuits to build and lots use chips and youtube saying the cheap adaptors are rubbish so wary. don't want to spend lots as defeats the idea. thinking of hand held mini pico laptop? Edited 2023-05-16 03:46 by stanleyella |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6835 |
VGA is analogue, so is AV. I doubt if there's anything to gain using an active adapter over a passive one. MMBasic doesn't care what the video is - it's always a simple 4-bit binary number feeding a resistor network to get analogue video, Hsync and Vsync. The weakest point will be the AV input circuitry of the display. They are often rough. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2150 |
I ordered https://www.ebay.co.uk/itm/266246510423 so cheap, will it work?? |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2150 |
does that mean picomite vga could just be composite v & h sync and video from the signals but different circuit to vga... and then convert to composite.? not a prob, will wait to see adaptor working. Mini vga displays not cheap. |
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Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4271 |
Analog video is interlaced video at 15.6 kHz. VGA is non interlaced, at 31kHz. These are not compatible, you need to frame grab the vga, convert rgb to yuv, and play it back with a different speed and line order. Then create combined hsync/vsync, phase modulate the color signals u and v. There are chips that do this, but it is not something the pico can do with simple resistors. You need analog chips for the analog part, the modulation) Volhout Edited 2023-05-16 07:39 by Volhout PicomiteVGA PETSCII ROBOTS |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2150 |
Good info Volhout, thanks. I think the vga adaptor I ordered will not have composite video, just the vga signals. doh :( I have a rpi 1,2,3 video out to vga which worked and usable so think vga to composite should be ok to. searching for circuits that are cheap, I would like a composite video option so get vga graphics on small CHEAP screen. |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4048 |
Hi folks, It still needs some titivating, but courtesy of @bigmik's PCB skills and with a little help from @Turbo46 and others: Final(?) schematic and gerbers will follow once the kinks have been ironed out. Best wishes, Tom Edited 2023-06-07 20:01 by thwill Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4271 |
Hi Tom, Very nice !! And it already plays 2 games !! Volhout PicomiteVGA PETSCII ROBOTS |
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lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3158 |
Looking good, Tom--congrats. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6835 |
That's really nice! :) Good work, Tom! Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4048 |
Thanks folks, I think the plaudits go to @bigmik; left to my own devices I would have been another 12-18 months to produce a PCB and even then the layout would not have been good. PicoVaders is @Martin H's work, I'm still messing with it to get the best behaviour on the Bintendo. Porting from the PicoMiteVGA to the Bintendo isn't trivial because the standard PicoMite firmware which the Bintendo runs doesn't have the same sprite support*. I'm hopeful I can implement an approximation of the missing bits as CSUBs, perhaps even by repurposing Peter's code from the PicoMiteVGA. * Though PicoVaders is simpler as Martin didn't use the sprite support ... it may not have been present when he started writing it. Best wishes, Tom Edited 2023-06-07 23:25 by thwill Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9177 |
The reason I haven't implemented sprites is that they rely on reading the LCD controller's framebuffer. This is too slow to be useful on SPI displays. It is OKish on SSD1963 displays but even on these it really needs 16-bit parallel rather than 8 as supported on the PicoMite. |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4048 |
Hi Peter, thanks for commenting, I'm not asking for you to implement anything. Don't we have a pair of 16-colour RAM framebuffers now ? I still haven't measured how long it takes to blit the entire display (or a good proportion of it) from RAM to the ILI9341 but it's on my TODO list. EDIT: Looks like it is about 14 fps if I'm measuring correctly, that's not completely awful: t = Timer FRAMEBUFFER Create FRAMEBUFFER Write F Dim colours%(4) = (RGB(Red),RGB(Green),RGB(Blue),RGB(Yellow),RGB(Cyan)) For i% = 1 To 100 For j% = 0 To 4 Box 0,0,320,240,,colours%(j%),colours%(j%) FRAMEBUFFER Copy F,N Next Next Print 1000 / ((Timer - t) / 500) Best wishes, Tom Edited 2023-06-08 00:26 by thwill Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2150 |
That is very neat. Well done. ... I prefer buttons to. I used the analogue pad and works much better than touch. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6835 |
I've just had a 1.80UKP analogue joystick working today. Not too bad at all, scaling the axis from 0-100 with 50 at midpoint or using it as a digital joystick. It's very promising. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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ice2642 Regular Member Joined: 27/05/2023 Location: BrazilPosts: 82 |
Very cool project, congratulations! Best Regards, MMBasic 5.0707 on PicoMite VGA |
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Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4271 |
Tom, I have been playing with sound on the VGA picomite, and have oe observation I would like ot share. The sound suffers from PRINT statements. Te print statements go to the USB interface (console), and I think that USB stack has impact on audio. Only after I removed the last PRINT statement (change to a TEXT statement) the audio was flawless on 126MHz CPU. Volhout Edited 2023-06-09 00:44 by Volhout PicomiteVGA PETSCII ROBOTS |
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