airbourne/airbourne/examples/time/main.cpp

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/*
 * Copyright (c) 2017, James Jackson
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "led.h"
#include "printf.h"
#include "revo_f4.h"
#include "vcp.h"

VCP* uartPtr = NULL;

static void _putc(void* p, char c)
{
  (void)p; // avoid compiler warning about unused variable
  uartPtr->put_byte(c);
}

int main()
{
  systemInit();

  VCP vcp;
  vcp.init();
  uartPtr = &vcp;

  init_printf(NULL, _putc);

  LED warn;
  warn.init(LED1_GPIO, LED1_PIN);
  LED info;
  info.init(LED2_GPIO, LED2_PIN);

  info.off();
  warn.on();

  const int size = 9;
  uint32_t delays[] = {1000, 100, 31, 2000000, 8000, 29238, 1900, 394177, 1923984};
  uint32_t time[size];
  uint32_t supposed[size];

  while (1)
  {
    warn.toggle();
    info.toggle();
    uint64_t start = micros();
    uint64_t sum = 0;
    delayMicroseconds(delays[0]);
    sum += delays[0];
    supposed[0] = sum;
    time[0] = micros() - start;

    delayMicroseconds(delays[1]);
    sum += delays[1];
    supposed[1] = sum;
    time[1] = micros() - start;

    delayMicroseconds(delays[2]);
    sum += delays[2];
    supposed[2] = sum;
    time[2] = micros() - start;

    delayMicroseconds(delays[3]);
    sum += delays[3];
    supposed[3] = sum;
    time[3] = micros() - start;
    //    for (int i = 0; i < size; i++)
    //    {
    //      delayMicroseconds(delays[i % size]);
    //      sum += delays[i % size];
    //      supposed[i] = sum;
    //      time[i] = micros() - start;
    //    }

    for (int i = 0; i < 4; i++)
    {
      printf("now_us: %lu, delays_us: %lu\n", supposed[i], time[i]);
    }
  }
}