Change SPI Pins

Using Arduino Microcontrollers
1

Actually I don't know how
but I have found the 51 pin of Arduino mega 2560 is not working.
I have tested by blinking LED.
but this pin is required for MOSI
can I change the MOSI pin with other pin in mega?

2

No. unfortunately not.

3

You can try to use MOSI pin on ICSP header, but the chance to resolve the issue is minimal, these pins a just the same

4 
#include <SPI.h>

const int customMISOPin = 48;  // Set your custom MISO pin
const int customMOSIPin = 49;  // Set your custom MOSI pin

void setup() {
  // Set custom MISO and MOSI pins
  pinMode(customMISOPin, INPUT);
  pinMode(customMOSIPin, OUTPUT);

  // Initialize SPI with custom pins
  SPCR |= _BV(SPE);  // Enable SPI
  SPCR |= _BV(MSTR); // Set as Master
  SPCR |= _BV(CPOL); // Set clock polarity (customize as needed)
  SPCR |= _BV(CPHA); // Set clock phase (customize as needed)
  
  // Set custom pins as MISO and MOSI
  SPCR &= ~_BV(MISO); // Clear default MISO pin
  SPCR |= (customMISOPin == 50) ? _BV(MISO) : 0; // Set custom MISO pin
  
  SPCR &= ~_BV(MOSI); // Clear default MOSI pin
  SPCR |= (customMOSIPin == 51) ? _BV(MOSI) : 0; // Set custom MOSI pin

  // Set clock and data mode
  // Uncomment and customize as needed
  // SPCR |= _BV(SPR1); // Set clock frequency (customize as needed)
  // SPCR |= _BV(SPR0);
}

void loop() {
  // Your main code goes here
  
  // Example: Sending data using SPI
  digitalWrite(SS, LOW); // Set slave select LOW to enable communication
  SPI.transfer(YourData); // Replace YourData with the actual data you want to send
  digitalWrite(SS, HIGH); // Set slave select HIGH to end communication
  
  // Your loop code continues here
}

is that code will work to change the miso and mosi pins?

5

The MEGA2560 has no functionality to remap the SPI hardware interface onto other pins.

You can use a software SPI library and use any pins you like - as far as I know....

6

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