# Configure Nano Every as SPI - SLAVE (with Example)

**URL:** <https://forum.arduino.cc/t/configure-nano-every-as-spi-slave-with-example/1403776>\
**Category:** Networking, Protocols, and Devices\
**Created:** [August 22, 2025, 10:23am UTC](https://forum.arduino.cc/t/configure-nano-every-as-spi-slave-with-example/1403776 "2025-08-22T10:23:32Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![knight\_electronics](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/knight_electronics/32/1127303_2.png) [@knight\_electronics](https://forum.arduino.cc/u/knight_electronics)\
**Post date:** [August 22, 2025, 10:23am UTC](https://forum.arduino.cc/t/configure-nano-every-as-spi-slave-with-example/1403776/1 "2025-08-22T10:23:32Z")

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**Arduino Nano Every Example: "Configure Nano Every as SPI - SLAVE"**

I was searching for a solution for Arduino Nano Every to set it up as SPI Slave, but I was not able to find a working C-Code (like copy paste) for this deadicated MCU.

Therefore, I've tried it out with two Arduino Nano Every Boards by myself and I could figure out a ready to use solution:

_Connection overview:_  
**Master \<-\> Slave**  
SCK (D13) \<-\> SCK (D13)  
MISO / CIPO (D12) \<-\> MISO / CIPO (D12)  
MOSI / COPI (D11) \<-\> MOSI / COPI (D11)  
CS / SS (D8) \<-\> CS / SS (D8)  
GND \<-\> GND

Both Arduino Boards are connected to the PC (with 2 separate USB cables).

**Master Code:**

```arduino
#include <SPI.h>

void setup (void) {
  Serial.begin(9600); //set baud rate

  pinMode(SS, OUTPUT);
  digitalWrite(SS, HIGH); // disable Slave Select
  SPI.begin ();
  SPI.setClockDivider(SPI_CLOCK_DIV32);//divide the clock
}

void loop (void) {
   char c;
   digitalWrite(SS, LOW); // enable Slave Select
   // send test string
   for (const char * p = "This is a TEST!\n" ; c = *p; p++) 
   {
      SPI.transfer (c);
      Serial.print(c);
   }
   digitalWrite(SS, HIGH); // disable Slave Select
   delay(2000);
}

```

**Slave Code:**

```arduino
#include <avr/io.h>
#include <avr/interrupt.h>

void setup() {
    // ... Serial initialization and other setup ...
    Serial.begin(9600); //set baud rate

    // NOTE: https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ApplicationNotes/ApplicationNotes/TB3215-Getting-Started-with-SPI-DS90003215.pdf
    
    //PORTMUX.TWISPIROUTEA &= ~PORTMUX_SPI00_bm; // cleared by default -> nothing to do
    PORTMUX.TWISPIROUTEA |= PORTMUX_SPI01_bm; // set Portmux bit SPI01 for alternative mapping of SPI pins

    // SPI in slave mode
    SPI0.CTRLA = SPI_DORD_bm | SPI_ENABLE_bm & (~SPI_MASTER_bm);

    // Set pin modes
    PORTE.DIR &= ~PIN0_bm; // MOSI
    PORTE.DIR |= PIN1_bm; // MISO
    PORTE.DIR &= ~PIN2_bm; // SCK
    PORTE.DIR &= ~PIN3_bm; // CS / SS

    // Interrupt setup
    sei(); // Enable global interrupts
    SPI0.INTCTRL = SPI_IE_bm; // SPI Interrupt enable
    SPI0.INTFLAGS |= SPI_IF_bm; // clear interruptflag - not cleared automatically

}

// SPI interrupt routine
ISR(SPI0_INT_vect) {
    Serial.print("ISR - Triggered!\n");

    SPI0.INTFLAGS |= SPI_IF_bm; // clear interruptflag - not cleared automatically
}

void loop() {
  Serial.print("And a new loop!\n");
  delay(5000);

}

```

I'll format this post maybe a little bit better in future, but I think that will help some guys, who are searching for exactly such a "template".

BR

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<div class="post-metadata">

**Author:** ![knight\_electronics](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/knight_electronics/32/1127303_2.png) [@knight\_electronics](https://forum.arduino.cc/u/knight_electronics)\
**Post date:** [August 22, 2025, 11:54am UTC](https://forum.arduino.cc/t/configure-nano-every-as-spi-slave-with-example/1403776/2 "2025-08-22T11:54:10Z")

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@spacefish: This is, I think, the solution to your issue you've raised in April 2020.  
Link: [Setting up Nano Every as SPI slave](https://forum.arduino.cc/t/setting-up-nano-every-as-spi-slave/647730)

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<div class="post-metadata">

**Author:** ![gilshultz](https://avatars.discourse-cdn.com/v4/letter/g/67e7ee/32.png) [@gilshultz](https://forum.arduino.cc/u/gilshultz)\
**Post date:** [August 23, 2025, 2:40am UTC](https://forum.arduino.cc/t/configure-nano-every-as-spi-slave-with-example/1403776/3 "2025-08-23T02:40:06Z")

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Post an annotated schematic, I do not have the time to spend on a word salad.

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<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [February 19, 2026, 2:40am UTC](https://forum.arduino.cc/t/configure-nano-every-as-spi-slave-with-example/1403776/4 "2026-02-19T02:40:15Z")

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