Driver for ST7789V2 chip for 240 x 320 LCD

[Leo928]

Hi micropython-nano-gui community,

I plan to buy this no-brand LCD with below specification.

Any idea on ST7789V2 SPI 4 wires driver?

On my search, one post says ST77789V2 is "popular" hence I plan to use this display ( https://forums.raspberrypi.com/viewtopic.php?t=368936 )

Many thanks

Specification
Resolution 240(H)RGB x320(V)pixels
Pixel arrangement RGB Vertical stripe
Interface 4 Line SPI
Display Colors 65Kcolor
Drive IC ST7789V2

Pins
SCL This pin is used to be serial interface clock.
SDA SPI interface input/output pin.
RES This signal will reset the device, Signal is active low.
DC Display data/command selection pin in 4-line serial interface.
CS LCD Chip selection pin, Low enable, High disable

This says the chip has 5 versions
https://www.sitronix.com.tw/en/products/aiot-device-ddi/
V, V2, V3, VP and Vi

[peterhinch]

There are numerous variants of ST7789 displays. This doc lists supported ones. If you choose an unsupported display you'll need to experiment to see if its setup matches any of the supported ones. We can provide guidance if none of the setups matches, but there are no gurantees.

[Leo928]

Hi Peter, Many thanks. Sure they have far too many variants. From your link, this supported board use the V version https://www.waveshare.com/wiki/Pico-LCD-2 From the side by side comparison of V and V2 versions, it seems the RGB write is the same? and may work (if no other function differs??)

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On Thu, Apr 17, 2025 at 4:39 PM Peter Hinch ***@***.***> wrote: There are numerous variants of ST7789 displays. This doc <https://github.com/peterhinch/micropython-nano-gui/blob/master/DISPLAYS.md> lists supported ones. If you choose an unsupported display you'll need to experiment to see if its setup matches any of the supported ones. We can provide guidance if none of the setups matches, but there are no gurantees. — Reply to this email directly, view it on GitHub <#100 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AZ75IIVRMTMRUAWYLUVSRWD2Z5SD7AVCNFSM6AAAAAB3JGI3NOVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEOBWGQ2TIOA> . You are receiving this because you authored the thread.Message ID: <peterhinch/micropython-nano-gui/repo-discussions/100/comments/12864548@ github.com>

[Leo928]

the data sheet side-by-side comparison on RGB write

[peterhinch]

When I referred to variants I meant that different board vendors wire the display to the chip in different ways. See the display constructor arg in the docs. You may need to experiment with values for this arg.

I'm not aware of any chip variant issues.

[Leo928]

Wonder if this is supported by the driver

This particular LCD panel uses ST7789V chip.

IM3 pin is broken out on the FPC connector. IM0, IM1 and IM2 pins are fixed inside.

if IM3 high, two separate pins are used for data IN and data OUT
if IM3 low, one pin is used as data IN and OUT

many thanks

[peterhinch]

The nano-gui driver does not read data back from the panel.

The MicroPython SPI interface assumes separate MOSI and MISO lines consequently the target device should be configured thus. In the case of this driver which does not read data there is no need to define a MISO pin if your port's SPI driver allows this.

[Leo928]

Hi Peter many thanks for your wonderful software and support!

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On Sat, Apr 26, 2025 at 8:07 PM Peter Hinch ***@***.***> wrote: The nano-gui driver does not read data back from the panel. The MicroPython SPI interface assumes separate MOSI and MISO lines consequently the target device should be configured thus. In the case of this driver which does not read data there is no need to define a MISO pin if your port's SPI driver allows this. — Reply to this email directly, view it on GitHub <#100 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AZ75IIWURVVNAWXXA25DG5L23NZGVAVCNFSM6AAAAAB3JGI3NOVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEOJVGQ3TIOI> . You are receiving this because you authored the thread.Message ID: <peterhinch/micropython-nano-gui/repo-discussions/100/comments/12954749@ github.com>