/*
  Wokwi Custom XOR chip example
*/


void setup() {}

void loop() {}


xor-chip-example.ino

diagram.json

// Wokwi Custom Chip - For information and examples see:
// https://docs.wokwi.com/chips-api/getting-started
//
// SPDX-License-Identifier: MIT
// Copyright (C) 2022 Uri Shaked / wokwi.com

#include "wokwi-api.h"
#include <stdio.h>
#include <stdlib.h>

typedef struct {
  pin_t pin_a;
  pin_t pin_b;
  pin_t pin_out;
} chip_state_t;

static void update_output(chip_state_t *chip) {
  uint32_t a = pin_read(chip->pin_a);
  uint32_t b = pin_read(chip->pin_b);
  uint32_t q = a ^ b;
  printf("Update output: %d %d => %d\n", a, b, q);
  pin_write(chip->pin_out, a ^ b);
}

static void chip_pin_change(void *user_data, pin_t pin, uint32_t value) {
  update_output((chip_state_t*)user_data);
}

void chip_init() {
  chip_state_t *chip = malloc(sizeof(chip_state_t));
  chip->pin_a = pin_init("A", INPUT);
  chip->pin_b = pin_init("B", INPUT);
  chip->pin_out = pin_init("OUT", OUTPUT);

  const pin_watch_config_t watch_config = {
    .edge = BOTH,
    .pin_change = chip_pin_change,
    .user_data = chip,
  };
  pin_watch(chip->pin_a, &watch_config);
  pin_watch(chip->pin_b, &watch_config);
  update_output(chip);
}
