/**
 ******************************************************************************
 * @file      syscalls.c
 * @author    Auto-generated by STM32CubeIDE
 * @brief     STM32CubeIDE Minimal System calls file
 *
 *            For more information about which c-functions
 *            need which of these lowlevel functions
 *            please consult the Newlib libc-manual
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2020-2024 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */

/* Includes */
#include <sys/stat.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/times.h>
#include <unistd.h>

#include "main.h"

int _getpid(void)
{
  return 1;
}

int _kill(int pid, int sig)
{
  UNUSED(pid);
  UNUSED(sig);

  errno = EINVAL;
  return -1;
}

int _read(int file, char *ptr, int len)
{
  UNUSED(file);

  *ptr = '\0'; //未实现
  return 0;
}

int _write(int file, char *ptr, int len)
{
  if (file == STDOUT_FILENO || file == STDERR_FILENO) {
    HAL_UART_Transmit(&DBG_UART, (uint8_t*)ptr, len, 0xFFFF); //使用串口打印printf信息
  }

  return len;
}

int _close(int file)
{
  UNUSED(file);

  return -1;
}

int _fstat(int file, struct stat *st)
{
  UNUSED(file);

  st->st_mode = S_IFCHR;
  return 0;
}

int _isatty(int file)
{
  UNUSED(file);

  return 1;
}

int _lseek(int file, int ptr, int dir)
{
  UNUSED(file);
  UNUSED(ptr);
  UNUSED(ptr);

  return 0;
}