#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/spi.h"
#include "hardware/adc.h"

#define NOISE_PIN 26
#define SPI_PORT spi0
#define SCK_PIN 18
#define SDI_PIN 19
#define CS_PIN 17

int main() {
  stdio_init_all();
  // while (true) {
  //   printf("Hello, Wokwi!\n");
  //   sleep_ms(250);
  // }
  adc_init();
  adc_gpio_init(26);
  adc_select_input(0);

  spi_init(SPI_PORT, 500000);
  gpio_set_function(SCK_PIN, GPIO_FUNC_SPI);
  gpio_set_function(SDI_PIN, GPIO_FUNC_SPI);

  gpio_init(CS_PIN);
  gpio_set_dir(CS_PIN, GPIO_OUT);
  gpio_put(CS_PIN, 1);

  printf("Starting RP2040\n");
  while (1) {
    gpio_put(CS_PIN, 0);
    const char msg[] = "Hello\n";
    printf("Sending: %s", msg);
    spi_write_blocking(SPI_PORT, (uint8_t*)msg, sizeof(msg) - 1);
    gpio_put(CS_PIN, 1);
    sleep_ms(500);

    uint16_t noise = adc_read();  // use adc_read() not gpio_get() for analog pin
    printf("Noise Level: %d\n", noise);
    sleep_ms(500);
  }
}