Two displays tft st7789, rp2040.

[MatSquikki]

Hello
I am using your library with good results on raspberry rp2040.
I wanted to use two identical displays on the two different SPIs, but I didn't understand very well how to define my pins for the second display, and how to call up the second display in my code. Can you help me with examples?

as setup I use this successfully.`
////////////////////////////////////////////////////////////////////////////////////////////
// Interface
////////////////////////////////////////////////////////////////////////////////////////////
#define TFT_PARALLEL_16_BIT

////////////////////////////////////////////////////////////////////////////////////////////
// Display driver type
////////////////////////////////////////////////////////////////////////////////////////////
#define ST7789_DRIVER

////////////////////////////////////////////////////////////////////////////////////////////
// RP2040 pins used
////////////////////////////////////////////////////////////////////////////////////////////

//#define TFT_CS -1 // Do not define, chip select control pin permanently connected to 0V

// These pins can be moved and are controlled directly by the library software
#define TFT_COUNT 2

//Definition of pin TFTsx-----------------------------
#define TFT_CS 17
#define TFT_RST 21
#define TFT_DC 20
#define TFT_MOSI 19
#define TFT_SCLK 18

//Definition of pin TFTdx----------------------------
//#define TFT1_CS 13
//#define TFT1_RST 15
//#define TFT1_DC 12
//#define TFT1_MOSI 11
//#define TFT1_SCLK 14

////////////////////////////////////////////////////////////////////////////////////////////
// Fonts to be available
////////////////////////////////////////////////////////////////////////////////////////////
#define LOAD_GLCD // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
#define LOAD_FONT2 // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
#define LOAD_FONT4 // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
#define LOAD_FONT6 // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
#define LOAD_FONT7 // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:.
#define LOAD_FONT8 // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
#define LOAD_GFXFF // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts

#define SMOOTH_FONT

////////////////////////////////////////////////////////////////////////////////////////////
`

[Bodmer]

The library only supports one SPI bus at a time. You could put 2 displays on the same SPI bus if they are of identical type and manage the chip select in the sketch. See here:
https://www.youtube.com/watch?v=WL8Xs5D2VUA

[MatSquikki]

OK, great I was what I was looking for!
Examples to study on this ??

[Bodmer]

Link from video....
https://github.com/kitecraft/Multiple_TFT_Displays

[MatSquikki]

Hello,
I tried the "Basic_Double_TFT.ino" example but it doesn't work,
even changing pins and frequencies but my displays show nothing.

[MatSquikki]

if I use "Setup_1" the display turns on and works perfectly with any example of the library.
If, on the other hand, I try to use "Setup_2" where I comment the PIN_CS and define it in my code "Prova_1", the display does not show anything.
Setup_1.txt
Setup_2 .txt
Prova_1.txt
.

[Bodmer]

I tried dual display and it is working fine so we need to find out what is odd about your hardware and software setup.

You have defined a Raspberry Pi display type in the setup, do you have that display type?

Post a link to the display vendors page.

Run the test and diagnostic sketch "Read_User_Setup" and post the serial monitor output here. Detail which board package you are using and the version number, you will find this in the Boards manager menu option.

The library does not support 16 bit displays and I see a commented out //#define TFT_PARALLEL_16_BIT. Are you using a fork of this library from somewhere else?

[MatSquikki]

Display used st7789 I attach photos.
Arduino ide version 1.8.13, board package Raspberry PI Pico / RP2040 By Earle F. Philhower version 1.12.0.
diagnostic sketch "Read_User_Setup" see File_1.
I had entered // # define TFT_PARALLEL_16_BIT because it intrigued me, but it is still not supported as a function and I had commented on it.
FIle_1.txt

[Bodmer]

How are you powering the display?

[MatSquikki]

I am feeding the display with the Pico power supply (3.3V), I also tried an external power supply (3.3V).