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electricat

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Joined: 30/11/2020
Location: Lithuania
Posts: 299

Posted: 06:57am 30 Nov 2021

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Hi,

I have 2.8 display driven by ili9325DS and by manufacturer set to i80-system 8-bit interface. (and I did not found locally any better offers. All china knockouts and no names. And sellers do not know (!) what they are selling :( )

Now, I lifted LCD and I see, I could change it to 8-bit 4 wires Serial Peripheral Interface. IM0-IM3 Lines are accessible and places for resistors populated. I would lift IM2 signal via additional resistor, ground DB10-DB17 lines, and all should be fine.

But what next?
The goal is not to save 8 I/O pins, but OPTION LCDPANEL.
Not sure any already built in LCD initialisations would match.
Any ideas?
Edited 2021-11-30 16:58 by electricat

My MMBasic 'sand box'

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10616

Posted: 08:51am 30 Nov 2021

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Quote But what next?

You will need to check that the row and column addressing are the same as the ILI9341 as well as the command to put the controller into write mode. Most controllers seem to have standardised on these so there is a good chance.
The ILI9341 driver is unlikely to initialise it properly so you then need to find an initialisation sequence for this controller. Armed with this it should then be possible to POKE the SPI and GPIO registers from Basic to send the new initialisation. You will need to dig into the RP2040 reference manual to understand how to do this but it shouldn't be too difficult.

This is a quite a bit of work and I really recommend the Waveshare displays that are made for the Pico and are fully supported by the firmware. They are good value and certainly in the UK don't take too long to arrive.

electricat

Senior Member

Joined: 30/11/2020
Location: Lithuania
Posts: 299

Posted: 10:32am 30 Nov 2021

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Found in online stocks few days away from me, this one ILI9488
https://www.waveshare.com/pico-restouch-lcd-3.5.htm

Thank you for pointing me, matherp!
P.S. Didn`t knew wavshare has line for pico already.

My MMBasic 'sand box'

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