tinyUSB/examples/device/board_test/src/main.c

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "bsp/board_api.h"

/* Blink pattern
 * - 250 ms  : button is not pressed
 * - 1000 ms : button is pressed (and hold)
 */
enum {
  BLINK_PRESSED = 250,
  BLINK_UNPRESSED = 1000
};

#define HELLO_STR   "Hello from TinyUSB\r\n"

int main(void) {
  board_init();
  board_led_write(true);

  uint32_t start_ms = 0;
  bool led_state = false;

  while (1) {
    uint32_t interval_ms = board_button_read() ? BLINK_PRESSED : BLINK_UNPRESSED;

    int ch = board_getchar();
    if (ch > 0) {
      board_putchar(ch);
    }

    // Blink and print every interval ms
    if (!(board_millis() - start_ms < interval_ms)) {
      start_ms = board_millis();

      if (ch < 0) {
        // skip if echoing
        printf(HELLO_STR);
        board_uart_write(HELLO_STR, strlen(HELLO_STR));
      }

      board_led_write(led_state);
      led_state = 1 - led_state; // toggle
    }
  }
}

#ifdef ESP_PLATFORM
void app_main(void) {
  main();
}
#endif