// Custom chips playground
// See https://link.wokwi.com/custom-chips-alpha for more info

void setup() {
}

void loop() {
    delay(100);
}


timer-chip.ino

diagram.json

Timer Chip

timer.chip.json

#include "wokwi-api.h"
#include <stdio.h>
#include <stdlib.h>

#define PIN_TIMER0 0
#define PIN_TIMER1 1
#define PIN_TIMER2 2
#define PIN_TIMER3 3

typedef struct {
  const char *pin_name;
  pin_t pin;
  uint8_t led_state;
} timer_data_t;

static void create_timer(char *pin_name, uint32_t interval);

void chip_init(void) {
  setvbuf(stdout, NULL, _IOLBF, 1024); // Limit output buffering to a single line
  printf("\nchip_init() begin\n");
  create_timer("TIMER0",  500000);
  create_timer("TIMER1", 1000000);
  create_timer("TIMER2", 1500000);
  create_timer("TIMER3", 2000000);
}

void chip_timer_callback(void *user_data) {
  timer_data_t *data = (timer_data_t*)user_data;
  printf("chip_timer_event called for pin %s\n", data->pin_name);
  pin_write(data->pin, data->led_state);
  data->led_state = !data->led_state;
}

void create_timer(char *pin_name, uint32_t interval) {
  timer_data_t *timer_data = (timer_data_t*)malloc(sizeof(timer_data_t));
  timer_data->pin_name = pin_name;
  timer_data->pin = pin_init(pin_name, OUTPUT);
  timer_data->led_state = 0;

  const timer_config_t config = {
    .callback = chip_timer_callback,
    .user_data = timer_data,
  };
  timer_t timer_id = timer_init(&config);
  timer_start(timer_id, interval, true);

  printf("Created timer %d on pin %s with interval: %d\n", timer_id, pin_name, interval);
}
