/**
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

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

#define LED_PIN 2

#define UART_ID uart0
#define BAUD_RATE 115200

// We are using pins 0 and 1, but see the GPIO function select table in the
// datasheet for information on which other pins can be used.
#define UART_TX_PIN 0
#define UART_RX_PIN 1

int main() {
  // Set up our UART with the required speed
  uart_init(UART_ID, BAUD_RATE);
  gpio_init(LED_PIN);
  gpio_set_dir(LED_PIN, GPIO_OUT);

  // Set the TX and RX pins by using the function select on the GPIO
  // Set datasheet for more information on function select
  gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
  gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);

  // Use some the various UART functions to send out data
  // In a default system, printf will also output via the default UART

  // Send out a character without any conversions
  uart_putc_raw(UART_ID, 'A');

  // Send out a character but do CR/LF conversions
  uart_putc(UART_ID, 'B');

  // Send out a string, with CR/LF conversions
  uart_puts(UART_ID, "C Hello, UART!\n");

  while (true) {
    gpio_put(LED_PIN, 1);
    uart_puts(UART_ID, "LED On\n");
    sleep_ms(1000);
    gpio_put(LED_PIN, 0);
    uart_puts(UART_ID, "LED Off\n"); 
    sleep_ms(1000);
  }
}