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Forum Index : Microcontroller and PC projects : Waveshare Pico Toys
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cdeagle Senior Member Joined: 22/06/2014 Location: United StatesPosts: 261 |
Peter, The ILI9381 driver works but the screen is dark-to-light from the left. The BACKLIGHT command doesn't seem to do much. Also, I cannot get the FORMATBOX graphic to work with the 2.8 inch display. All the other advanced graphics command seem to work. |
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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8578 |
Try ILI9481 Works for me: GUI FORMATBOX #1, DATE1, 50, 150, 150, 40 Do Loop There is a bug causing a reset related to format box after leaving the program and editing or re-running but the basic functionality seems to work Edited 2021-10-17 05:01 by matherp |
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darthvader Regular Member Joined: 31/01/2020 Location: FrancePosts: 72 |
I just get an interesting promo from Elektor .... waveshare evaluation board for raspberry pi pico The LCD , SD Card , Audio , etc... made it a good starting board. You just have to add the pico on it ;) Theory is when we know everything but nothing work ... Practice is when everything work but no one know why ;) |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5714 |
The main problem with the Waveshare boards (and some others) is that unless you use stackable female headers on the pico (or use an expansion board of some sort) there's no-where to connect Pico pins to anything else. The picture in that link shows it very well - you can't connect anything to the Pico if you use the normal male pins. This was something I worked hard at when I did my PicoMite Backpack pcb. :) Edited 2021-10-17 07:20 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
That's weird, I had just found these and then I came here. |
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Poppy Guru Joined: 25/07/2019 Location: GermanyPosts: 486 |
What about using these with longer legs?! Andre ... such a GURU? | ||||
Poppy Guru Joined: 25/07/2019 Location: GermanyPosts: 486 |
Is the item you are talking about exactly this one (circuit diagram)? Andre ... such a GURU? | ||||
Poppy Guru Joined: 25/07/2019 Location: GermanyPosts: 486 |
Try ILI9481 ... Is the item you are talking about exactly this one (circuit diagram)? Actually now I am a little more confused. Is there any important difference between these 2 boards concerning compatibility? Pico_Eval-Board Pico-Res-Touch ... or will both work without any problems? Andre ... such a GURU? | ||||
matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8578 |
Both of them wire the display in parallel and then use shift registers to create a SPI I/F (hence all the extra chips). This does not present the same as a normal SPI connected ILI9488 and it appears from cdeagle doesn't work. The only driver I have ever written to use this sort of connection is the ILI9481 driver which may or may not be compatible. I don't have one of these displays so am unable to test and/or get it working. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5714 |
What about using these with longer legs?! ------------ I'm not sure I like that idea of synthesized SPI on those displays. It's rather like creating a new serial interface that's neither I2C nor true SPI. Just checking ebay for a 10ft barge pole to keep them away. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8578 |
cdeagle Please try the attached PicoMiteV5.07.00b29.zip Use the option OPTION LCDPANEL ILI9488W,GP8,GP15,GP9,GP13 Edited 2021-10-17 18:29 by matherp |
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cdeagle Senior Member Joined: 22/06/2014 Location: United StatesPosts: 261 |
Peter, Results from b29. Asterisk is text that TBS doesn't like. > option system spi gp10,gp11,gp12 > option lcdpanel ILI9488W,gp8,gp15,gp9,gp13 Error : Orientation > option list OPTION SYSTEM SPI GP10,GP11,GP12 OPTION LCDPANEL ST7789Read, *,NULL,NULL,NULL > text 10,10, "testing" Error : Display not configured |
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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8578 |
Sorry missed the orientation in the command option lcdpanel ILI9488W,L,gp8,gp15,gp9,gp13 and found something else as well - new version in a minute Edited 2021-10-17 19:31 by matherp |
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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8578 |
Please do OPTION RESET before loading this PicoMiteV5.07.00b29.zip OPTION SYSTEM SPI GP10,GP11,GP12 OPTION LCDPANEL ILI9488W, LANDSCAPE,GP8,GP15,GP9,GP13 |
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cdeagle Senior Member Joined: 22/06/2014 Location: United StatesPosts: 261 |
Peter, In order to turn off the grey-to-white display of the 9488, I have to set BACKLIGHT 5. Then I cannot see any graphics on the display. If I leave BACKLIGHT 100, the display seems to work, at least simple text and GUI TEST LCDPANEL. Of course it's hard to read. Here's a photo of the display with BACKLIGHT 10 and GUI TEST LCDPANEL running. David |
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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8578 |
Just to confirm, the new ILI9488W driver is working but the backlight is overpowering? Try this version (last try possible without a display) PicoMite.zip Edited 2021-10-17 20:20 by matherp |
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cdeagle Senior Member Joined: 22/06/2014 Location: United StatesPosts: 261 |
Peter, ILI9488W driver is working. Latest uf2 has reduced the display backlight almost completely. Still some on the right side of the display. Photo attached. David |
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matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8578 |
This is now using the initialisation specified by Waveshare in their demo code so nothing more I can do. The rest of the light bleed is presumably just down to the way the display is made. I'll post this version as a new beta. |
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cdeagle Senior Member Joined: 22/06/2014 Location: United StatesPosts: 261 |
Thanks for your help Peter. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5714 |
It doesn't appear to be a very even backlight at all. Changing the brightness will be a compromise at best - it's the way the display is assembled. Either that or there's a bank of LEDs down the dark side that isn't working. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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