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NPHighview

Senior Member

Joined: 02/09/2020
Location: United States
Posts: 200

Posted: 10:48pm 09 Jun 2023

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After attempting to port hhtg1968's program to the WebMite and the WaveShare Pico-Eval-Board display, I think I may have either uncovered a misunderstanding on my part, or an error in the WebMite documentation or firmware.

Page 133 of the WebMite manual says

Quote PIXEL(x,y [,page_number]) Returns the colour of a pixel on an LCD display. ... The display must use one of the SSD1963, ILI9341, ILI9488, or ST7789_320 controllers.

Here is the "minimal" test program I wrote:

Rem minimal test of ILI9844W functionality
CLS RGB(Blue)
Print MM.Info(LCDPANEL), MM.Info(VERSION)
Print Pixel(MM.HRes/2, MM.VRes/2)

Here is the result:

> RUN
ILI9488W 5.070801
[4] Print Pixel(MM.HRes/2, MM.VRes/2)
Error : Invalid on this display

Here is my setup:

WebMite MMBasic Version 5.07.08b1
OPTION SYSTEM SPI GP10,GP11,GP12
OPTION AUTORUN 4
OPTION COLOURCODE ON
OPTION POWER PWM ON
OPTION DISPLAY 60, 132
OPTION LCDPANEL ILI9488W, RPORTRAIT,GP8,GP15,GP9,GP13
OPTION WIFI ***********, *********
OPTION TOUCH GP16,GP17
GUI CALIBRATE 1, 139, 272, 840, 1285
OPTION SDCARD GP22, GP5, GP18, GP19

Live in the Future. It's Just Starting Now!

disco4now

Guru

Joined: 18/12/2014
Location: Australia
Posts: 897

Posted: 11:18pm 09 Jun 2023

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ILI9488 and ILI9488W are implemented differently. ILI9488W does not allow read on the SPI so the Pixel function can not work.

Latest F4 Latest H7

lizby
Guru

Joined: 17/05/2016
Location: United States
Posts: 3150

Posted: 11:19pm 09 Jun 2023

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Works for me.

PicoMite MMBasic Version 5.07.07RC7
Copyright 2011-2023 Geoff Graham
Copyright 2016-2023 Peter Mather

>
> AUTOSAVE
Rem minimal test of ILI9844W functionality
CLS RGB(Blue)
Print MM.Info(LCDPANEL), MM.Info(VERSION)
Print Pixel(MM.HRes/2, MM.VRes/2)
Saved 100 bytes
> save "ILI9488-pixel.bas"
> run
ILI9488 5.0707
252
> list
Rem minimal test of ILI9844W functionality
CLS RGB(Blue)
Print MM.Info(LCDPANEL), MM.Info(VERSION)
Print Pixel(MM.HRes/2, MM.VRes/2)
> ?hex$(pixel(mm.hres/2,mm.vres/2))
FC
>
> option list
PicoMite MMBasic Version 5.07.07RC7
OPTION SYSTEM SPI GP18,GP19,GP16
OPTION KEYBOARD US
OPTION CPUSPEED (KHz) 378000
OPTION LCDPANEL ILI9488, RLANDSCAPE,GP21,GP20,GP17
OPTION GUI CONTROLS 40
OPTION TOUCH GP22,GP7
GUI CALIBRATE 0, 158, 282, 1252, 887

Are you sure your ILI9488 supports MISO (does BLIT READ work?)?

PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed

phil99

Guru

Joined: 11/02/2018
Location: Australia
Posts: 2138

Posted: 11:22pm 09 Jun 2023

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https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=16001&LastEntry=Y#205585#205585

Search TBS, a lot has been said on this topic.

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 9129

Posted: 07:37am 10 Jun 2023

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The ILI9488W is not the ILI9488. The manual is correct. The ILI9488W does not and can not support reading the framebuffer. Check the schematic to understand why

NPHighview

Senior Member

Joined: 02/09/2020
Location: United States
Posts: 200

Posted: 08:51pm 10 Jun 2023

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Thank you, Peter. I suppose the "W" means "Write-Only".

Live in the Future. It's Just Starting Now!

hhtg1968
Senior Member

Joined: 25/05/2023
Location: Germany
Posts: 123

Posted: 09:08pm 10 Jun 2023

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meanwhile i posted version 5 of this simulation...

lifepx5.bas.zip

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