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Topic: Shared SPI Bus - RFID reader & Display (Read 148 times) previous topic - next topic



So I know there are quite a few topics on shared SPI bus, but I still can't wrap my head around this. I have an RC522 rfid reader, which I use in SPI mode and works perfect. Then I also have a TFT display, the HXD8357D from Adafruit, which also uses the SPI bus. I know that they need to have same MOSI, MISO and SCK, but different SS pins. Yet it doesn't work. Connections are as follows:

     RC522 Connections:                                    HXD8357 Connections:
     SDA (SS) - Pin 10                                                CS - Pin 7   
     SCK - Pin 13                                                       SCK - Pin 13
     MOSI - Pin 11                                                     MOSI - Pin 11
     MISO - Pin 12                                                     MISO - Pin 12   
     IRQ -  Not connected                                           D/C - Pin 9
     GND - GND                                                        GND - GND   
     RST - Pin 5
     3.3V - 3.3V                                                        5V - 5V Arduino   

I can of course add the code, although it's like 500 lines. Hope someone can give me a suggestion on this.

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