LED toggle using SPI

Solving Approach

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Code

#include <SPI.h>

#define SS_PIN 10
#define BUTTON_PIN 2

bool ledState = false;
const uint8_t DEBOUNCE_DELAY = 50;

unsigned long lastDebounceTime = 0;
uint8_t lastStableState = HIGH;
uint8_t currentState = HIGH;

void setup() {
  pinMode(SS_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  
  SPI.begin();
  digitalWrite(SS_PIN, HIGH);  
}

void loop() {
  if (debouncedPress()) {
    ledState = !ledState;

    digitalWrite(SS_PIN, LOW);              
    SPI.transfer(ledState ? 0x01 : 0x00);   
    digitalWrite(SS_PIN, HIGH);             
  }
}

bool debouncedPress() {
  uint8_t reading = digitalRead(BUTTON_PIN);

  if (reading != lastStableState) {
    lastDebounceTime = millis();
    lastStableState = reading;
  }

  if ((millis() - lastDebounceTime) > DEBOUNCE_DELAY && reading != currentState) {
    currentState = reading;
    return (currentState == LOW);
  }

  return false;
}

Output

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