serial.c

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// Copyright (c) 2010-2016 The YP-Spur Authors, except where otherwise indicated.
//
// 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 <math.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif  // HAVE_CONFIG_H

/* ボディパラメータ */
#include <shvel-param.h>

/* yp-spur用 */
#include <serial.h>
#include <communication.h>
#include <utility.h>
#include <param.h>
#include <ypspur-coordinator.h>
#include <yprintf.h>

#include <errno.h>
double SER_BAUDRATE;

/* serial */
#if !defined(__MINGW32__)

// Unix用コード
#include <sys/select.h>
#include <sys/termios.h>
int g_device_port = 0;
struct termios g_oldtio;

#else

// Windows用コード
#include <windows.h>
HANDLE g_hdevices = NULL;
DCB g_olddcb;
COMMTIMEOUTS g_oldcto;

#endif  // !defined(__MINGW32__)

#if !defined(__MINGW32__)
speed_t i2baud(int baud)
{
  switch (baud)
  {
    case 0:
      return B0;
    case 9600:
      return B9600;
    case 19200:
      return B19200;
    case 38400:
      return B38400;
#ifdef B57600
    case 57600:
      return B57600;
#endif  // B57600
#ifdef B128000
    case 128000:
      return B128000;
#endif  // B128000
#ifdef B115200
    case 115200:
      return B115200;
#endif  // B115200
#ifdef B230400
    case 230400:
      return B230400;
#endif  // B230400
#ifdef B460800
    case 460800:
      return B460800;
#endif  // B460800
#ifdef B576000
    case 576000:
      return B576000;
#endif  // B576000
#ifdef B921600
    case 921600:
      return B921600;
#endif  // B921600
  }
  return -1;
}

int baud2i(speed_t baud)
{
  switch (baud)
  {
    case B0:
      return 0;
    case B9600:
      return 9600;
    case B19200:
      return 19200;
    case B38400:
      return 38400;
#ifdef B57600
    case B57600:
      return 57600;
#endif  // B57600
#ifdef B128000
    case B128000:
      return 128000;
#endif  // B128000
#ifdef B115200
    case B115200:
      return 115200;
#endif  // B115200
#ifdef B230400
    case B230400:
      return 230400;
#endif  // B230400
#ifdef B460800
    case B460800:
      return 460800;
#endif  // B460800
#ifdef B576000
    case B576000:
      return 576000;
#endif  // B576000
#ifdef B921600
    case B921600:
      return 921600;
#endif  // B921600
  }
  return -1;
}
#else
DWORD i2baud(int baud)
{
  switch (baud)
  {
    case 9600:
      return CBR_9600;
    case 19200:
      return CBR_19200;
    case 38400:
      return CBR_38400;
    case 115200:
      return CBR_115200;
    case 128000:
      return CBR_128000;
  }
  return CBR_110;
}
#endif  // !defined(__MINGW32__)

// ポートが接続可能か調べる
int serial_tryconnect(char *device_name)
{
#if !defined(__MINGW32__)
  // Unix用
  g_device_port = open(device_name, O_RDWR);
  if (g_device_port < 0)
  {
    return 0;
  }
  close(g_device_port);
#else
  // Windows用
  // ファイルハンドラの作成
  g_hdevices = CreateFile(device_name, GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
  if (g_hdevices == INVALID_HANDLE_VALUE)
  {
    return 0;
  }
  CloseHandle(g_hdevices);
#endif  // !defined(__MINGW32__)
  return 1;
}

int recieve_throw(char *buf, int len, double t, void *data)
{
  buf[len] = 0;
  strcat((char *)data, buf);
  if (strstr((char *)data, "\n\n"))
  {
    return -2;
  }
  return 0;
}

int serial_change_baudrate(int baud)
{
#if !defined(__MINGW32__)
  struct termios newtio;
  int ret, errnum;
  char buf[2048];

  memset(&newtio, 0, sizeof(newtio));  // 新しいポートの設定の構造体をクリアする

  // シリアルのボーレートを設定
  // 8bit 通信
  // スタートビット1
  // エンドビット１
  // パリティー無し
  // 合計 10bit

  newtio.c_cflag = CS8 | CLOCAL | CREAD | CRTSCTS;
  errno = 0;
  ret = cfsetispeed(&newtio, i2baud(baud));
  if (ret < 0)
  {
    errnum = errno;
    yprintf(OUTPUT_LV_ERROR, "Error: Failed to set input baud rate to %d\n", baud);
    yprintf(OUTPUT_LV_DEBUG, "Error: cfsetispeed: %s(%d)\n", strerror(errnum), errnum);
    return 0;
  }
  errno = 0;
  ret = cfsetospeed(&newtio, i2baud(baud));
  if (ret < 0)
  {
    errnum = errno;
    yprintf(OUTPUT_LV_ERROR, "Error: Failed to set output baud rate to %d\n", baud);
    yprintf(OUTPUT_LV_DEBUG, "Error: cfsetospeed: %s(%d)\n", strerror(errnum), errnum);
    return 0;
  }
  SER_BAUDRATE = (double)baud;
  newtio.c_iflag = IGNPAR;  // パリティエラーのデータは無視する
  newtio.c_oflag = 0;       // Disable implementation dependent processing

  newtio.c_cc[VTIME] = 0; /* キャラクタ間タイマを使わない */
  newtio.c_cc[VMIN] = 1;  /* 1文字来るまで，読み込みをブロックする */

  if (tcsetattr(g_device_port, TCSAFLUSH, &newtio))
  {
    errnum = errno;
    yprintf(OUTPUT_LV_ERROR, "Error: Failed to set attribute of serial port\n");
    yprintf(OUTPUT_LV_DEBUG, "Error: tcsetattr: %s(%d)\n", strerror(errnum), errnum);
    return 0;
  }

  {  // ---> check bit rate
    struct termios term;
    speed_t isp, osp;
    errno = 0;

    ret = tcgetattr(g_device_port, &term);
    if (ret < 0)
    {
      errnum = errno;
      yprintf(OUTPUT_LV_ERROR, "Error: Failed to get  attribute of serial port\n");
      yprintf(OUTPUT_LV_DEBUG, "Error: tcgetattr: %s(%d)\n", strerror(errnum), errnum);
      return 0;
    }
    isp = cfgetispeed(&term);
    osp = cfgetospeed(&term);

    if (baud2i(isp) != baud || baud2i(osp) != baud)
    {
      // fail to set bit rate
      yprintf(OUTPUT_LV_ERROR, "Error: Requested baudrate is %d/%d, \n   but sellected baudrate is %d/%d.\n",
              baud, baud, baud2i(isp), baud2i(osp));
      return 0;
    }
  }  // <--- check bit rate

  ret = write(g_device_port, "\n\nVV\n\n", 6);
  yp_usleep(10000);
  serial_recieve(recieve_throw, buf);
#else
  // Windows用
  DCB dcb;

  // シリアルポートの状態操作
  GetCommState(g_hdevices, &dcb);  // シリアルポートの状態を取得
  dcb.fBinary = 1;
  dcb.fParity = 0;
  dcb.fOutxCtsFlow = 0;
  dcb.fOutxDsrFlow = 0;
  dcb.fDtrControl = DTR_CONTROL_DISABLE;
  dcb.fDsrSensitivity = FALSE;
  dcb.Parity = NOPARITY;
  dcb.StopBits = ONESTOPBIT;
  dcb.ByteSize = 8;
  dcb.BaudRate = i2baud(baud);
  SER_BAUDRATE = (double)baud;
  SetCommState(g_hdevices, &dcb);  // シリアルポートの状態を設定
#endif  // !defined(__MINGW32__)
  return 1;
}

// ポートをオープンして 通信の準備をする
int serial_connect(char *device_name)
{
#if !defined(__MINGW32__)
  g_device_port = open(device_name, O_RDWR);

  if (g_device_port < 0)
  {
    yprintf(OUTPUT_LV_ERROR, "Error: Can't open serial port.\n");
    return 0;
  }

  tcgetattr(g_device_port, &g_oldtio);

  serial_change_baudrate(DEFAULT_BAUDRATE);
#else
  // Windows用
  // DCB dcb;
  COMMTIMEOUTS cto;

  // ファイルハンドラの作成
  g_hdevices = CreateFile(device_name, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  if (g_hdevices == INVALID_HANDLE_VALUE)
  {
    return 0;
  }
  // シリアルポートの状態操作
  GetCommState(g_hdevices, &g_olddcb);  // シリアルポートの状態を取得
  serial_change_baudrate(DEFAULT_BAUDRATE);

  // シリアルポートのタイムアウト状態操作
  GetCommTimeouts(g_hdevices, &cto);       // タイムアウトの設定状態を取得
  GetCommTimeouts(g_hdevices, &g_oldcto);  // タイムアウトの設定状態を取得
  cto.ReadIntervalTimeout = 0;
  cto.ReadTotalTimeoutMultiplier = 0;
  cto.ReadTotalTimeoutConstant = 1000;
  cto.WriteTotalTimeoutMultiplier = 0;
  cto.WriteTotalTimeoutConstant = 1000;
  SetCommTimeouts(g_hdevices, &cto);  // タイムアウトの状態を設定
#endif  // !defined(__MINGW32__)
  return 1;
}

// ポートを閉じる
int serial_close(void)
{
#if !defined(__MINGW32__)
  // Unix用
  // 設定を元に戻す
  if (g_device_port != 0)
  {
    tcsetattr(g_device_port, TCSANOW, &g_oldtio);
    close(g_device_port);
    g_device_port = 0;
  }
#else
  // Windows用
  if (g_hdevices != NULL)
  {
    SetCommState(g_hdevices, &g_olddcb);     // シリアルポートの状態を設定
    SetCommTimeouts(g_hdevices, &g_oldcto);  // タイムアウトの状態を設定
    CloseHandle(g_hdevices);
    g_hdevices = NULL;
  }
#endif  // !defined(__MINGW32__)

  return 1;
}

void serial_flush_in(void)
{
#if !defined(__MINGW32__)
  // Unix用
  tcflush(g_device_port, TCIFLUSH);
#else
  // Windows用
  char buf[4096];

  DWORD len;
  DWORD ret;
  COMSTAT state;

  while (1)
  {
    ClearCommError(g_hdevices, &ret, &state);
    len = state.cbInQue;

    if (len > 0)
    {
      if (len > 4000)
        len = 4000;
      if (!ReadFile(g_hdevices, buf, len, &len, NULL))
      {
        return;
      }
      break;
    }
    else if (len == 0)
      break;
    yp_usleep(5000);
  }
#endif  // !defined(__MINGW32__)
}

void serial_flush_out(void)
{
#if !defined(__MINGW32__)
  // Unix用
  tcflush(g_device_port, TCOFLUSH);
#else
// Windows用
#endif  // !defined(__MINGW32__)
}

// シリアルポートからの受信処理
int serial_recieve(int (*serial_event)(char *, int, double, void *), void *data)
{
  char buf[4096];
  double receive_time;
  int retval;

  while (1)
  {
#if !defined(__MINGW32__)
    // Unix用
    fd_set rfds;
    struct timeval tv;
    size_t len;

    tv.tv_sec = 0;
    tv.tv_usec = 200000;
    FD_ZERO(&rfds);
    FD_SET(g_device_port, &rfds);

    retval = select(g_device_port + 1, &rfds, NULL, NULL, &tv);
    if (retval < 0)
    {
      int errnum;
      errnum = errno;
      yprintf(OUTPUT_LV_DEBUG, "Error: Select in serial_recieve failed. (%s)\n", strerror(errnum));
      return -1;
    }
    else if (retval == 0)
    {
      yprintf(OUTPUT_LV_DEBUG, "Error: Select timed out\n");
      return -1;
    }
    receive_time = get_time();

    len = read(g_device_port, buf, 4000);
    if (len < 0)
    {
      int errnum;
      errnum = errno;
      yprintf(OUTPUT_LV_DEBUG, "Error: Read in serial_recieve failed. (%s)\n", strerror(errnum));
      return -1;
    }
    else if (len == 0)
    {
      yprintf(OUTPUT_LV_DEBUG, "Error: Read timed out\n");
      return -1;
    }
#else
    // Windows用
    DWORD len;
    DWORD ret;
    COMSTAT state;
    int timeout_count;

    timeout_count = 0;
    while (1)
    {
      if (!ClearCommError(g_hdevices, &ret, &state))
        return -1;
      if (ret)
        return -1;
      len = state.cbInQue;
      if (len > 4000)
        len = 4000;
      if (len > 0)
        break;
      yp_usleep(5000);
      timeout_count++;
      if (timeout_count > 500 / 5)
        return -1;
    }
    receive_time = get_time();
    if (!ReadFile(g_hdevices, buf, len, &len, NULL))
    {
      return -1;
    }
    buf[len] = 0;
#endif  // !defined(__MINGW32__)
    buf[len] = 0;

    if (len > 0)
    {
      retval = serial_event(buf, len, receive_time, data);
      if (retval < 0)
        return retval;
    }
  }
}

int encode_write(char *data, int len)
{
  unsigned char buf[128];
  int encode_len, ret;

  buf[0] = COMMUNICATION_START_BYTE;
  encode_len = encode((unsigned char *)data, len, buf + 1, 126);
  buf[encode_len + 1] = COMMUNICATION_END_BYTE;

  ret = serial_write((char *)buf, encode_len + 2);
  if (ret <= 0)
  {
    return -1;
  }
  serial_flush_out();

  return 0;
}

int serial_write(char *buf, int len)
{
#if !defined(__MINGW32__)
  // Unix用
  int ret;
#else
  // Windows用
  DWORD ret;
#endif  // !defined(__MINGW32__)

  do
  {
#if !defined(__MINGW32__)
    // Unix用
    ret = write(g_device_port, buf, len);
#else
    // Windows用
    buf[len] = 0;
    WriteFile(g_hdevices, buf, len, (LPDWORD)&ret, 0);
#endif  // !defined(__MINGW32__)
    // printf("SEND: %s - %d(%d)\n",buf,len,ret);fflush(stdout);
    if (ret <= 0 && len > 0)
    {
      return -1;
    }
    len -= ret;
    buf += ret;
  } while (len > 0);

#ifdef __APPLE__
  yp_usleep(100);
#endif  // __APPLE__
  return 1;
}