Problem using dual displays with RP2040_PIO_SPI

[crstrater]

Hello, I'm trying to get the Animated_Eyes_2 example working on a Feather RP2040 with two these 1.54" wide angle TFT displays from Adafruit (https://www.adafruit.com/product/3787). I've only been able to get anything to display at all with RP2040_PIO_SPI defined. Whenever I try to write to both displays only the display with the CS pin defined in my user setup is written to. When I run the Animated_Eyes_2 example you can see both eyes flickering on one screen. If I change the user setup to the pin the other display is wired to, it will write both images on that display. This is also the case the when using the Multiple TFT Displays example [url=https://github.com/kitecraft/Multiple_TFT_Displays]here.[/url] The displays are only written to once in that example, but you can see the text meant for display 2 on display 1, as that is overwriting what was already on display 1.

I've verified that both displays work and the wiring is fine, and I've been able to modify the graphicstest sketch from the Adafruit ST7789 library to write to both screens. I've been able to modify the original Uncanny Eyes project as well, but the framerate is way too slow with the 240x240 screens. Bellow is my user setup for TFT_eSPI and the example multi display sketch. Thank you for your help!

#define USER_SETUP_ID 303

// Define to disable all #warnings in library (can be put in User_Setup_Select.h)
//#define DISABLE_ALL_LIBRARY_WARNINGS

#define ST7789_DRIVER      // Full configuration option, define additional parameters below for this display

#define RP2040_PIO_SPI
#define RPI_DISPLAY_TYPE

#define TFT_WIDTH  240
#define TFT_HEIGHT 240

#define CGRAM_OFFSET      // Library will add offsets required

#define TFT_CS 7   	// Chip Select pin
#define TFT_DC 8	// Data Command control pin 
#define TFT_RST 9
#define TFT_SCLK 18
#define TFT_MOSI 19
//#define TFT_MISO 20 // RX PIN - Not Connected

#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_FONT8N // Font 8. Alternative to Font 8 above, slightly narrower, so 3 digits fit a 160 pixel TFT
#define LOAD_GFXFF  // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts

#define SMOOTH_FONT

#define SPI_FREQUENCY       40000000
#define SPI_READ_FREQUENCY  20000000
//#define SPI_TOUCH_FREQUENCY  2500000

TFT_eSPI_MultiDisplay.ino

/*
In the TFT_ESPI user_setup.h file
be sure to comment out the line for TFT_CS
//#define TFT_CS   21  // Chip select control pin
*/

#include <SPI.h>
#include <TFT_eSPI.h> // Hardware-specific library

#define firstScreenCS 7
#define secondScreenCS 11
TFT_eSPI tft = TFT_eSPI();       // Invoke custom library


void setup() {
  pinMode(firstScreenCS, OUTPUT);
  digitalWrite(firstScreenCS, HIGH);
  
  pinMode(secondScreenCS, OUTPUT);
  digitalWrite(secondScreenCS, HIGH);
  

  // We need to 'init' both displays
  // at the same time. so set both cs pins low
  digitalWrite(firstScreenCS, LOW);
  digitalWrite(secondScreenCS, LOW);
  
  tft.init();
  tft.setTextSize(2);
  
  // Set both cs pins HIGH, or 'inactive'
  digitalWrite(firstScreenCS, HIGH);
  digitalWrite(secondScreenCS, HIGH);



  /*
   Update the first screen
   all 'tft.' call must be done
   after setting the cs pin low
  */
  digitalWrite(firstScreenCS, LOW);
  tft.setRotation(1);  
  tft.fillScreen(TFT_RED);
  tft.setCursor(0,10);
  tft.print("Hello World.\nI'm display #1");
  // set the cs pin back to HIGH when finished
  // with this particular display
  digitalWrite(firstScreenCS, HIGH);


  // Update the second screen
  digitalWrite(secondScreenCS, LOW);
  tft.setRotation(2);  
  tft.fillScreen(TFT_GREEN);
  tft.setCursor(0,10);
  tft.print("Hello World.\nI'm display #2");
  digitalWrite(secondScreenCS, HIGH);

  
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(100);
}