1 | /*
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2 | * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without modification,
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6 | * are permitted provided that the following conditions are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright notice,
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9 | * this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 | * this list of conditions and the following disclaimer in the documentation
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12 | * and/or other materials provided with the distribution.
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13 | * 3. The name of the author may not be used to endorse or promote products
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14 | * derived from this software without specific prior written permission.
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15 | *
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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25 | * OF SUCH DAMAGE.
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26 | *
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27 | * This file is part of the lwIP TCP/IP stack.
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28 | *
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29 | */
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30 |
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31 | #include <lwip/opt.h>
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32 | #include <lwip/sys.h>
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33 | #include <lwip/sio.h>
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34 |
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35 | #include <stdio.h>
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36 | #include <stdarg.h>
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37 |
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38 | #ifdef _MSC_VER
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39 | #pragma warning (push, 3)
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40 | #endif
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41 | #include <windows.h>
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42 | #ifdef _MSC_VER
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43 | #pragma warning (pop)
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44 | #endif
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45 | #include "lwipcfg.h"
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46 |
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47 | /** When 1, use COM ports, when 0, use named pipes (for simulation). */
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48 | #ifndef SIO_USE_COMPORT
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49 | #define SIO_USE_COMPORT 1
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50 | #endif
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51 |
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52 | /** If SIO_USE_COMPORT==1, use COMx, if 0, use a pipe (default) */
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53 | #if SIO_USE_COMPORT
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54 | #define SIO_DEVICENAME "\\\\.\\COM"
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55 | #else
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56 | #define SIO_DEVICENAME "\\\\.\\pipe\\lwip"
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57 | #endif
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58 |
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59 | #if SIO_USE_COMPORT
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60 | #ifndef SIO_COMPORT_SPEED
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61 | #define SIO_COMPORT_SPEED 115200
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62 | #endif
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63 | #ifndef SIO_COMPORT_BYTESIZE
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64 | #define SIO_COMPORT_BYTESIZE 8
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65 | #endif
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66 | #ifndef SIO_COMPORT_STOPBITS
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67 | #define SIO_COMPORT_STOPBITS 0 /* ONESTOPBIT */
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68 | #endif
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69 | #ifndef SIO_COMPORT_PARITY
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70 | #define SIO_COMPORT_PARITY 0 /* NOPARITY */
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71 | #endif
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72 | #endif /* SIO_USE_COMPORT */
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73 |
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74 | static int sio_abort = 0;
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75 |
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76 | /* \\.\pipe\lwip0 */
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77 | /* pppd /dev/ttyS0 logfile mylog debug nocrtscts local noauth noccp ms-dns 212.27.54.252 192.168.0.4:192.168.0.5
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78 | */
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79 |
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80 | /**
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81 | * SIO_DEBUG: Enable debugging for SIO.
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82 | */
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83 | #ifndef SIO_DEBUG
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84 | #define SIO_DEBUG LWIP_DBG_OFF
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85 | #endif
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86 |
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87 | #if SIO_USE_COMPORT
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88 | /** When using a real COM port, set up the
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89 | * serial line settings (baudrate etc.)
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90 | */
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91 | static BOOL
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92 | sio_setup(HANDLE fd)
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93 | {
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94 | COMMTIMEOUTS cto;
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95 | DCB dcb;
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96 |
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97 | /* set up baudrate and other communication settings */
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98 | memset(&dcb, 0, sizeof(dcb));
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99 | /* Obtain the DCB structure for the device */
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100 | if (!GetCommState(fd, &dcb)) {
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101 | return FALSE;
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102 | }
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103 | /* Set the new data */
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104 | dcb.BaudRate = SIO_COMPORT_SPEED;
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105 | dcb.ByteSize = SIO_COMPORT_BYTESIZE;
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106 | dcb.StopBits = 0; /* ONESTOPBIT */
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107 | dcb.Parity = 0; /* NOPARITY */
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108 | dcb.fParity = 0; /* parity is not used */
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109 | /* do not use flow control */
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110 | /*dcb.fOutxDsrFlow = dcb.fDtrControl = 0;
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111 | dcb.fOutxCtsFlow = dcb.fRtsControl = 0;
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112 | dcb.fErrorChar = dcb.fNull = 0;
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113 | dcb.fInX = dcb.fOutX = 0;
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114 | dcb.XonChar = dcb.XoffChar = 0;
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115 | dcb.XonLim = dcb.XoffLim = 100;*/
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116 |
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117 | /* Set the new DCB structure */
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118 | if (!SetCommState(fd, &dcb)) {
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119 | return FALSE;
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120 | }
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121 |
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122 | memset(&cto, 0, sizeof(cto));
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123 | if(!GetCommTimeouts(fd, &cto))
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124 | {
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125 | return FALSE;
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126 | }
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127 | /* change read timeout, leave write timeout as it is */
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128 | cto.ReadIntervalTimeout = 1;
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129 | cto.ReadTotalTimeoutMultiplier = 0;
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130 | cto.ReadTotalTimeoutConstant = 1; /* 1 ms */
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131 | if(!SetCommTimeouts(fd, &cto)) {
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132 | return FALSE;
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133 | }
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134 |
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135 | return TRUE;
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136 | }
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137 | #endif /* SIO_USE_COMPORT */
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138 |
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139 | /**
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140 | * Opens a serial device for communication.
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141 | *
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142 | * @param devnum device number
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143 | * @return handle to serial device if successful, NULL otherwise
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144 | */
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145 | sio_fd_t sio_open(u8_t devnum)
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146 | {
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147 | HANDLE fileHandle = INVALID_HANDLE_VALUE;
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148 | CHAR fileName[256];
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149 | LWIP_DEBUGF(SIO_DEBUG, ("sio_open(%lu)\n", (DWORD)devnum));
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150 | #if SIO_USE_COMPORT
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151 | snprintf(fileName, 255, SIO_DEVICENAME"%lu", (DWORD)(devnum));
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152 | #else /* SIO_USE_COMPORT */
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153 | snprintf(fileName, 255, SIO_DEVICENAME"%lu", (DWORD)(devnum & ~1));
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154 | if ((devnum & 1) == 0) {
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155 | fileHandle = CreateNamedPipeA(fileName, PIPE_ACCESS_DUPLEX, PIPE_TYPE_BYTE | PIPE_NOWAIT,
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156 | PIPE_UNLIMITED_INSTANCES, 102400, 102400, 100, NULL);
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157 | } else
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158 | #endif /* SIO_USE_COMPORT */
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159 | {
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160 | fileHandle = CreateFileA(fileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
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161 | }
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162 | if (fileHandle != INVALID_HANDLE_VALUE) {
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163 | sio_abort = 0;
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164 | #if !SIO_USE_COMPORT
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165 | if (devnum & 1) {
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166 | DWORD mode = PIPE_NOWAIT;
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167 | if (!SetNamedPipeHandleState(fileHandle, &mode, NULL, NULL)) {
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168 | LWIP_DEBUGF(SIO_DEBUG, ("sio_open(%lu): SetNamedPipeHandleState failed. GetLastError() returns %d\n",
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169 | (DWORD)devnum, GetLastError()));
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170 | }
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171 | } else
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172 | #endif /* !SIO_USE_COMPORT */
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173 | {
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174 | FlushFileBuffers(fileHandle);
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175 | }
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176 | #if SIO_USE_COMPORT
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177 | if(!sio_setup(fileHandle)) {
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178 | CloseHandle(fileHandle);
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179 | LWIP_DEBUGF(SIO_DEBUG, ("sio_open(%lu): sio_setup failed. GetLastError() returns %lu\n",
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180 | (DWORD)devnum, GetLastError()));
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181 | return NULL;
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182 | }
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183 | #endif /* SIO_USE_COMPORT */
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184 | LWIP_DEBUGF(SIO_DEBUG, ("sio_open: file \"%s\" successfully opened.\n", fileName));
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185 | printf("sio_open: file \"%s\" (%d) successfully opened: 0x%08x\n", fileName, devnum, LWIP_PTR_NUMERIC_CAST(unsigned int, fileHandle));
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186 | return (sio_fd_t)(fileHandle);
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187 | }
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188 | LWIP_DEBUGF(SIO_DEBUG, ("sio_open(%lu) failed. GetLastError() returns %lu\n",
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189 | (DWORD)devnum, GetLastError()));
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190 | printf("sio_open(%lu) failed. GetLastError() returns %lu\n",
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191 | (DWORD)devnum, GetLastError());
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192 | return NULL;
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193 | }
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194 |
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195 | /**
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196 | * Sends a single character to the serial device.
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197 | *
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198 | * @param c character to send
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199 | * @param fd serial device handle
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200 | *
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201 | * @note This function will block until the character can be sent.
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202 | */
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203 | void sio_send(u8_t c, sio_fd_t fd)
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204 | {
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205 | DWORD dwNbBytesWritten = 0;
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206 | LWIP_DEBUGF(SIO_DEBUG, ("sio_send(%lu)\n", (DWORD)c));
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207 | while ((!WriteFile((HANDLE)(fd), &c, 1, &dwNbBytesWritten, NULL)) || (dwNbBytesWritten < 1)) {
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208 | }
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209 | }
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210 |
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211 | /**
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212 | * Receives a single character from the serial device.
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213 | *
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214 | * @param fd serial device handle
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215 | *
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216 | * @note This function will block until a character is received.
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217 | */
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218 | u8_t sio_recv(sio_fd_t fd)
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219 | {
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220 | DWORD dwNbBytesReadden = 0;
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221 | u8_t byte = 0;
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222 | LWIP_DEBUGF(SIO_DEBUG, ("sio_recv()\n"));
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223 | while ((sio_abort == 0) && ((!ReadFile((HANDLE)(fd), &byte, 1, &dwNbBytesReadden, NULL)) || (dwNbBytesReadden < 1)));
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224 | LWIP_DEBUGF(SIO_DEBUG, ("sio_recv()=%lu\n", (DWORD)byte));
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225 | return byte;
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226 | }
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227 |
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228 | /**
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229 | * Reads from the serial device.
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230 | *
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231 | * @param fd serial device handle
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232 | * @param data pointer to data buffer for receiving
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233 | * @param len maximum length (in bytes) of data to receive
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234 | * @return number of bytes actually received - may be 0 if aborted by sio_read_abort
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235 | *
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236 | * @note This function will block until data can be received. The blocking
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237 | * can be cancelled by calling sio_read_abort().
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238 | */
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239 | u32_t sio_read(sio_fd_t fd, u8_t* data, u32_t len)
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240 | {
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241 | BOOL ret;
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242 | DWORD dwNbBytesReadden = 0;
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243 | LWIP_DEBUGF(SIO_DEBUG, ("sio_read()...\n"));
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244 | ret = ReadFile((HANDLE)(fd), data, len, &dwNbBytesReadden, NULL);
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245 | LWIP_DEBUGF(SIO_DEBUG, ("sio_read()=%lu bytes -> %d\n", dwNbBytesReadden, ret));
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246 | LWIP_UNUSED_ARG(ret);
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247 | return dwNbBytesReadden;
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248 | }
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249 |
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250 | /**
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251 | * Tries to read from the serial device. Same as sio_read but returns
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252 | * immediately if no data is available and never blocks.
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253 | *
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254 | * @param fd serial device handle
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255 | * @param data pointer to data buffer for receiving
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256 | * @param len maximum length (in bytes) of data to receive
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257 | * @return number of bytes actually received
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258 | */
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259 | u32_t sio_tryread(sio_fd_t fd, u8_t* data, u32_t len)
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260 | {
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261 | /* @todo: implement non-blocking read */
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262 | BOOL ret;
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263 | DWORD dwNbBytesReadden = 0;
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264 | LWIP_DEBUGF(SIO_DEBUG, ("sio_read()...\n"));
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265 | ret = ReadFile((HANDLE)(fd), data, len, &dwNbBytesReadden, NULL);
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266 | LWIP_DEBUGF(SIO_DEBUG, ("sio_read()=%lu bytes -> %d\n", dwNbBytesReadden, ret));
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267 | LWIP_UNUSED_ARG(ret);
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268 | return dwNbBytesReadden;
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269 | }
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270 |
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271 | /**
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272 | * Writes to the serial device.
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273 | *
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274 | * @param fd serial device handle
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275 | * @param data pointer to data to send
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276 | * @param len length (in bytes) of data to send
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277 | * @return number of bytes actually sent
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278 | *
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279 | * @note This function will block until all data can be sent.
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280 | */
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281 | u32_t sio_write(sio_fd_t fd, u8_t* data, u32_t len)
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282 | {
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283 | BOOL ret;
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284 | DWORD dwNbBytesWritten = 0;
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285 | LWIP_DEBUGF(SIO_DEBUG, ("sio_write()...\n"));
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286 | ret = WriteFile((HANDLE)(fd), data, len, &dwNbBytesWritten, NULL);
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287 | LWIP_DEBUGF(SIO_DEBUG, ("sio_write()=%lu bytes -> %d\n", dwNbBytesWritten, ret));
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288 | LWIP_UNUSED_ARG(ret);
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289 | return dwNbBytesWritten;
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290 | }
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291 |
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292 | /**
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293 | * Aborts a blocking sio_read() call.
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294 | * @todo: This currently ignores fd and aborts all reads
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295 | *
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296 | * @param fd serial device handle
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297 | */
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298 | void sio_read_abort(sio_fd_t fd)
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299 | {
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300 | LWIP_UNUSED_ARG(fd);
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301 | LWIP_DEBUGF(SIO_DEBUG, ("sio_read_abort() !!!!!...\n"));
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302 | sio_abort = 1;
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303 | return;
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304 | }
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