Need advice for ST7735 Display with Touch

[ams-hh]

Hello,
until now I used an ILI9341 display with Touch. Both Touch and display SPI interface come with all pins and I used the following configuration
-DILI9341_DRIVER=1
-DTFT_WIDTH=240
-DTFT_HEIGHT=320
-DTFT_MISO=12
-DTFT_MOSI=7
-DTFT_SCLK=6
-DTFT_CS=9
-DTFT_DC=15
-DTFT_RST=17
;-DTFT_BL=21
-DTOUCH_CS=5
-DLOAD_GLCD=1
-DLOAD_FONT2=1
-DLOAD_FONT4=1
-DLOAD_FONT6=1
-DLOAD_FONT7=1
-DLOAD_FONT8=1
-DLOAD_GFXFF=1
-DSMOOTH_FONT=1
-DSPI_FREQUENCY=27000000

And everything works well. (THANKS TO BODMER)

Now I need real small display with Touch and the only one I coud find is an ST7735 based 1.8 inch.

Link > (Variant: 1.8 inch with Touch)

Before ordering, I wanted to clarify the interface....
The difference to the mentioned ILI9341 display above is that this one's TFT SPI Interface does not come with SDI/SDO but with AO. As I learned from User-Sertup.h:
"// The DC (Data Command) pin may be labelled AO or RS (Register Select)"
OK so far.

But .... until now I used the SDI/SDO/SCK from display and touch in parallel. (SDO & touch SDO wired-or with two diods).
Because of the AO-pin, which is, if I understood right, a combined in/iout, ths cannot be done any more...?

So the question is:

• How to wire such a display and
• How to define the config TFT_xxx. (TOUCH_CS keeps pin T_CS, I believe)

Is there anybody who has done this before? (For sure!)

Regards
Andree

[ams-hh]

Solved it.
My asumptions regarding the AO pin were wrong.
Everything is straight forward.
The mentioned 160x128 Display can be wired as follows:

And the definitions (in platformio.ini) looks like:

[env:ST7735_esp32S3]
build_flags = 
  -DUSER_SETUP_LOADED=1
  
  ; Define the TFT driver, pins etc here:

  -DST7735_DRIVER=1
  -DST7735_GREENTAB=1
  -DTFT_WIDTH=128
  -DTFT_HEIGHT=160

  -DTFT_MISO=10
  -DTFT_MOSI=5
  -DTFT_SCLK=9
  -DTFT_CS=1
  -DTFT_DC=4
  -DTFT_RST=2

  -DTOUCH_CS=18

  -DLOAD_GLCD=1
  -DLOAD_FONT2=1
  -DLOAD_FONT4=1
  -DLOAD_FONT6=1
  -DLOAD_FONT7=1
  -DLOAD_FONT8=1
  -DLOAD_GFXFF=1
  -DSMOOTH_FONT=1
  -DSPI_FREQUENCY=27000000

The used GPIO from the ESP32-S3 are more or less randomly, as long as no strapping pins are selected.

[ams-hh]

Had to make one addition:
#define TFT_RGB_ORDER=TFT_RGB
is required because Red/Blue were inverted.
(And show up correctly with this #define)
So the correct platformio.ini is:

[env:ST7735_esp32S3]
build_flags = 
  -DUSER_SETUP_LOADED=1
  
  ; Define the TFT driver, pins etc here:

  -DST7735_DRIVER=1
  -DST7735_GREENTAB=1
  -DTFT_RGB_ORDER=TFT_RGB
  -DTFT_WIDTH=128
  -DTFT_HEIGHT=160

  -DTFT_MISO=10
  -DTFT_MOSI=5
  -DTFT_SCLK=9
  -DTFT_CS=1
  -DTFT_DC=4
  -DTFT_RST=2

  -DTOUCH_CS=18

  -DLOAD_GLCD=1
  -DLOAD_FONT2=1
  -DLOAD_FONT4=1
  -DLOAD_FONT6=1
  -DLOAD_FONT7=1
  -DLOAD_FONT8=1
  -DLOAD_GFXFF=1
  -DSMOOTH_FONT=1
  -DSPI_FREQUENCY=27000000