don't get my display to display anything

Hardware Arduino Due
6

Hi David,

it is working now. Yesterday before I asked I almost had it right except for that I had changed the value in tft.init(240, 240, SPI_MODE2) to mode 0 and afterwards (when I had wired it correctly) did not set it back to mode 2. I am currently using it with an ultrasonic device to measure distance. Here's the main code for the display:

#include <Adafruit_GFX.h>    // Core graphics library
#include <Adafruit_ST7789.h> // Hardware-specific library for ST7789
#include <SPI.h>             // Arduino SPI library

#define TFT_CS    10  // define chip select pin
#define TFT_DC    9  // define data/command pin
#define TFT_RST   8  // define reset pin, or set to -1 and connect to Arduino RESET pin
 
// Initialize Adafruit ST7789 TFT library
Adafruit_ST7789 tft = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_RST);

int distance;

[...]


void setup() {
[...]
tft.init(240, 240, SPI_MODE2);tft.setRotation(2);
tft.fillScreen(ST77XX_BLUE);
}

void testdrawtext(int text, uint16_t color, uint8_t size,char *text2) {
  tft.setCursor(0, 0);
  tft.setTextColor(color);
  tft.setTextSize(size);
  tft.setTextWrap(true);
  tft.print(text);
  tft.print(text2);
}

[...]

void loop() {

[...]

  tft.fillScreen(ST77XX_BLUE);
  testdrawtext(distance, ST77XX_WHITE,6,"cm");}

[...]
}

and the wiring as you said (instead of #11 and #13 use D75, D76 i.e. MOSI (SDA), SCK), rest as in the simple-circuit.com link above.

Thanks for you help, David!

also thanks to ard_newbie for the links

step1