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Forum Index : Microcontroller and PC projects : Can't get touch to run with ILI9341

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dddns
Guru

Joined: 20/09/2024
Location: Germany
Posts: 687
Posted: 12:03pm 27 Oct 2025
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Hello,

I remember there was a discussion how this issue could be solved
by modifying the circuit. Something with removing a diode and adding a bridge/resistor.
But I cannot remember what exactly there is to do.

Would somebody who knows please help me or point me to the discussion?

Many thanks!
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10545
Posted: 12:13pm 27 Oct 2025
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no mod needed for the ili9341. The mod applies to the ili9488
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 5405
Posted: 12:17pm 27 Oct 2025
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Hi dddns,

Look at U2, there is something between pin 7 and 8. A short ?

Volhout
PicomiteVGA PETSCII ROBOTS
 
dddns
Guru

Joined: 20/09/2024
Location: Germany
Posts: 687
Posted: 12:37pm 27 Oct 2025
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  Volhout said  Hi dddns,

Look at U2, there is something between pin 7 and 8. A short ?

Volhout


Thank you for answers.

@Volhout
After I posted the picture I saw it for the first time. Even with two reading glasses as sandwich this was not visible to me.

I will give an update
 
dddns
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Joined: 20/09/2024
Location: Germany
Posts: 687
Posted: 09:29am 28 Oct 2025
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I got it :)

it was a bumpy ride but finally everything is working.
First there was this short and another electrical issue.
And then a longer journey to find a pin assignment which works with all devices.
Touch was not possible to get to run clean as use this config, e.g Option touch gp20,gp21 wold not work. Having system spi on gp22,gp23,gp20 doesn't work either.
But no problem, this is working:
PicoMite MMBasic USB RP2350B Edition V6.01.00RC9
OPTION SERIAL CONSOLE COM2,GP8,GP9
OPTION SYSTEM SPI GP2,GP3,GP0
OPTION LCD SPI GP14,GP15,GP12
OPTION SYSTEM I2C GP4,GP5
OPTION FLASH SIZE 16777216
OPTION COLOURCODE ON
OPTION KEYBOARD US, 0, 0, 150, 50
OPTION PICO OFF
OPTION CPUSPEED (KHz) 378000
OPTION LCDPANEL CONSOLE 7,,, 50
OPTION DISPLAY 30, 53
OPTION LCDPANEL ILI9341BUFF, LANDSCAPE,GP16,GP17,GP18,GP19
OPTION LCD BACKLIGHT 50
OPTION TOUCH GP26,GP27
GUI CALIBRATE 0, 3984, 3772, -869, -639
OPTION SDCARD GP10
OPTION KEYBOARD REPEAT 150,50
OPTION AUDIO GP6,GP7', ON PWM CHANNEL 3
OPTION RTC AUTO ENABLE
OPTION DEFAULT FONT 7, 1
OPTION PSRAM PIN GP47
 
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