# Custom Inverter Chip example

Start the simulation. The green LED shows the output of the inverter.

For more information: https://docs.wokwi.com/chips-api/getting-started


README.md

diagram.json

// For information and examples see:
// https://docs.wokwi.com/chips-api/getting-started

#include "wokwi-api.h"
#include <stdio.h>
#include <stdlib.h>

typedef struct {
  pin_t pin_in;
  pin_t pin_out;
} chip_state_t;

static void chip_pin_change(void *user_data, pin_t pin, uint32_t value) {
  chip_state_t *chip = (chip_state_t*)user_data;
  printf("Pin change: %d %d\n", pin, value);
  pin_write(chip->pin_out, !value);
}

void chip_init(void) {
  chip_state_t *chip = malloc(sizeof(chip_state_t));
  chip->pin_in = pin_init("IN", INPUT);
  chip->pin_out = pin_init("OUT", OUTPUT);
  pin_write(chip->pin_out, !pin_read(chip->pin_in));

  const pin_watch_config_t config = {
    .edge = BOTH,
    .pin_change = chip_pin_change,
    .user_data = chip,
  };
  pin_watch(chip->pin_in, &config);
}
