Switching from NRF24L01 to SPI TFT?

I have an NRF24L01 and an SPI ILI9341 TFT connected to my arduino nano. They work well separately, but once they are together, the TFT just can’t be refreshed, after I do anything with the NRF module.
I have tried setting LOW/HIGH the Chip select pins of the two devices in any possible combinations, but the NRF module ALWAYS keeps working (I can see on the serial monitor I receive data), but the TFT only does the thing that I have written in the setup(). For example in I put my “displayStaticElements()” after the radio.begin(), the TFT would do nothing.

So I am sure the problem is switching between the two SPI devices. But how?

#include <SPI.h>             
#include <nRF24L01.h>
#include <RF24.h>
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include "Fonts/FreeSans18pt7b.h"
#include "Fonts/FreeSans12pt7b.h"

#define NRF_CSN 8
#define NRF_CE 7
RF24 radio(NRF_CE, NRF_CSN);    // CE, CSN
const byte address[6] = "00001";

#define TFT_DC 9
#define TFT_CS 3
#define TFT_RST 6
#define TFT_MISO 12
#define TFT_MOSI 11
#define TFT_CLK 13
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST, TFT_MISO);

struct packageOfWeatherData{
    float temperature;
    float humidity;
    float heatindex;
  };
typedef struct packageOfWeatherData PackageOfWeatherData;
PackageOfWeatherData weatherDataPackage;

float inTemp;
float inHum;
float outTemp;
float outHum;
float prevOutTemp;
float prevOutHum;

void setup() {
  pinMode(TFT_CS, OUTPUT);
  pinMode(NRF_CSN, OUTPUT);
  
  tft.begin();
  tft.setRotation(0);
  displayStaticElements();      //displaying square frame, line, celsius/humidity symbols, only need once
  
  radio.begin();
  radio.openReadingPipe(1, address);
  radio.setPALevel(RF24_PA_MAX);
  radio.setChannel(100);
  radio.setDataRate(RF24_250KBPS);
  radio.startListening();

 // SPI.begin();
  Serial.begin(9600);
  
}
  
void loop() {

    if (radio.available()) {
      radio.read(&weatherDataPackage, sizeof(weatherDataPackage));

      Serial.println("new data");
      
     if(weatherDataPackage.temperature != outTemp || weatherDataPackage.humidity != outHum){
        prevOutTemp = outTemp;
        prevOutHum = outHum;
        outTemp = weatherDataPackage.temperature;
        outHum = weatherDataPackage.humidity;
        Serial.println(outTemp);

        digitalWrite(NRF_CSN, HIGH);
       }
  }


  digitalWrite(TFT_CS, LOW);                        // DOES NOT WORK
  tft.setTextSize(2);
  tft.setCursor(75,88); tft.print(outTemp,1);         //display outside temp
  delay(1000);

}



void displayStaticElements(){
  
      tft.fillScreen(ILI9341_BLACK);                      // fill entire screen with black
      tft.drawRoundRect(0,0,240,320,13,ILI9341_WHITE);    // draw a rounder rectangular frame
      tft.drawFastHLine(15,159,210,0xC618);               // two horizontal light grey lines in the half of the display
      tft.drawFastHLine(15,160,210,0xC618);
      
      tft.setFont(&FreeSans18pt7b); tft.setTextColor(ILI9341_WHITE); tft.setTextSize(0);
      tft.setCursor(15,40); tft.print("Kint:");
      tft.setCursor(15,200); tft.print("Bent:");
    
      tft.setFont(&FreeSans12pt7b); tft.setTextSize(2);
      tft.setCursor(186,88); tft.print("C");
      tft.setCursor(180,141); tft.print("%");
      tft.setCursor(186,240); tft.print("C");
      tft.setCursor(180,300); tft.print("%");
      
      tft.setFont(&FreeSans12pt7b); tft.setTextSize(0); 
      tft.setCursor(173,64); tft.print("o");
      tft.setCursor(173,216); tft.print("o");
  }

I presume this line is intended to make the TFT active

  digitalWrite(TFT_CS, LOW);                        // DOES NOT WORK

and I wonder if it needs to be accompanied by a line to disable the nRF24 - perhaps

  digitalWrite(NRF_CSN, HIGH);
  digitalWrite(TFT_CS, LOW);                        // DOES NOT WORK

I can't recall whether HIGH or LOW is the active state, but that is easy to check..

...R

Yes, they are, but no matter how I set them, the NRF module is always active.

tosoki_tibor:
Yes, they are,

I don't know what that means.

the NRF module is always active.

Does this mean that the nRF module is working properly - reliably transmitting and receiving?

...R