LCD + another SPI device on a mega?

Other Hardware Displays
1

Hi

I have this display (KHB31FC2)

And this RFID reader (RFID-RC522)

Library: RFID.zip from this page (I also tried the MFRC522 library. Same issue)

When i connect the shield and the reader, the rfid doesn't work. When i unplug the display shield, the rfid works.

I am just using an example sketch that looks like this:

#include <SPI.h>
#include <RFID.h>

#define SDA_DIO 45
#define RESET_DIO 22
RFID RC522(SDA_DIO, RESET_DIO); 

void setup()
{ 
  
  Serial.begin(9600);
  SPI.begin(); 
  RC522.init();
}

void loop()
{

  if (RC522.isCard())
  {
   
    RC522.readCardSerial();
    Serial.println("Card detected:");
    for(int i=0;i<5;i++)
    {
    Serial.print(RC522.serNum[i],DEC);
    }
    Serial.println();
  }
  delay(1000);
}

The connection between the arduino mega and RFID-RC522 look like this:

RFID Mega
--------- ---------
SDA 45
SCK 52
MOSI 51
MISO 50
GND GND
RST 22
3.3V 3.3V
IRQ Not connected
2

I solved it by cutting the MOSI pin off of the icsp header on the arduino. - Looks like its only used for the sd card anyway. Touch still works, screen works, rfid works.