| 1 | /* |
| 2 | * boblight |
| 3 | * Copyright (C) Bob 2009 |
| 4 | * |
| 5 | * boblight is free software: you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the |
| 7 | * Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * boblight is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 13 | * See the GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <iostream>//debug |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <unistd.h> |
| 23 | #include <fcntl.h> |
| 24 | |
| 25 | #include "../serialport.h" |
| 26 | #include "../baudrate.h" |
| 27 | #include "../../util/misc.h" |
| 28 | #include "../../util/timeutils.h" |
| 29 | |
| 30 | using namespace std; |
| 31 | |
| 32 | CSerialPort::CSerialPort() |
| 33 | { |
| 34 | m_fd = -1; |
| 35 | } |
| 36 | |
| 37 | CSerialPort::~CSerialPort() |
| 38 | { |
| 39 | Close(); |
| 40 | } |
| 41 | |
| 42 | int CSerialPort::Write(uint8_t* data, int len) |
| 43 | { |
| 44 | fd_set port; |
| 45 | |
| 46 | if (m_fd == -1) |
| 47 | { |
| 48 | m_error = "port closed"; |
| 49 | return -1; |
| 50 | } |
| 51 | |
| 52 | int byteswritten = 0; |
| 53 | |
| 54 | while (byteswritten < len) |
| 55 | { |
| 56 | FD_ZERO(&port); |
| 57 | FD_SET(m_fd, &port); |
| 58 | int returnv = select(m_fd + 1, NULL, &port, NULL, NULL); |
| 59 | if (returnv == -1) |
| 60 | { |
| 61 | m_error = GetErrno(); |
| 62 | return -1; |
| 63 | } |
| 64 | |
| 65 | returnv = write(m_fd, data + byteswritten, len - byteswritten); |
| 66 | if (returnv == -1) |
| 67 | { |
| 68 | m_error = GetErrno(); |
| 69 | return -1; |
| 70 | } |
| 71 | byteswritten += returnv; |
| 72 | } |
| 73 | |
| 74 | //print what's written to stdout for debugging |
| 75 | // if (m_tostdout) |
| 76 | // { |
| 77 | // printf("%s write:", m_name.c_str()); |
| 78 | // for (int i = 0; i < byteswritten; i++) |
| 79 | // printf(" %02x", (unsigned int)data[i]); |
| 80 | |
| 81 | // printf("\n"); |
| 82 | // } |
| 83 | |
| 84 | return byteswritten; |
| 85 | } |
| 86 | |
| 87 | int CSerialPort::Read(uint8_t* data, int len, int iTimeoutMs /*= -1*/) |
| 88 | { |
| 89 | fd_set port; |
| 90 | struct timeval timeout, *tv; |
| 91 | int64_t now, target; |
| 92 | int bytesread = 0; |
| 93 | |
| 94 | if (m_fd == -1) |
| 95 | { |
| 96 | m_error = "port closed"; |
| 97 | return -1; |
| 98 | } |
| 99 | |
| 100 | if (iTimeoutMs >= 0) |
| 101 | { |
| 102 | now = GetTimeMs(); |
| 103 | target = now + (int64_t) iTimeoutMs; |
| 104 | } |
| 105 | |
| 106 | while (bytesread < len && (iTimeoutMs < 0 || target > now)) |
| 107 | { |
| 108 | if (iTimeoutMs < 0) |
| 109 | { |
| 110 | tv = NULL; |
| 111 | } |
| 112 | else |
| 113 | { |
| 114 | timeout.tv_sec = ((long int)target - (long int)now) / (long int)1000.; |
| 115 | timeout.tv_usec = ((long int)target - (long int)now) % (long int)1000.; |
| 116 | tv = &timeout; |
| 117 | } |
| 118 | |
| 119 | FD_ZERO(&port); |
| 120 | FD_SET(m_fd, &port); |
| 121 | int returnv = select(m_fd + 1, &port, NULL, NULL, tv); |
| 122 | |
| 123 | if (returnv == -1) |
| 124 | { |
| 125 | m_error = GetErrno(); |
| 126 | return -1; |
| 127 | } |
| 128 | else if (returnv == 0) |
| 129 | { |
| 130 | break; //nothing to read |
| 131 | } |
| 132 | |
| 133 | returnv = read(m_fd, data + bytesread, len - bytesread); |
| 134 | if (returnv == -1) |
| 135 | { |
| 136 | m_error = GetErrno(); |
| 137 | return -1; |
| 138 | } |
| 139 | |
| 140 | bytesread += returnv; |
| 141 | |
| 142 | if (iTimeoutMs > 0) |
| 143 | now = GetTimeMs(); |
| 144 | } |
| 145 | |
| 146 | //print what's read to stdout for debugging |
| 147 | // if (m_tostdout && bytesread > 0) |
| 148 | // { |
| 149 | // printf("%s read:", m_name.c_str()); |
| 150 | // for (int i = 0; i < bytesread; i++) |
| 151 | // printf(" %02x", (unsigned int)data[i]); |
| 152 | // |
| 153 | // printf("\n"); |
| 154 | // } |
| 155 | |
| 156 | return bytesread; |
| 157 | } |
| 158 | |
| 159 | //setting all this stuff up is a pain in the ass |
| 160 | bool CSerialPort::Open(string name, int baudrate, int databits/* = 8*/, int stopbits/* = 1*/, int parity/* = PAR_NONE*/) |
| 161 | { |
| 162 | m_name = name; |
| 163 | m_error = GetErrno(); |
| 164 | |
| 165 | if (databits < 5 || databits > 8) |
| 166 | { |
| 167 | m_error = "Databits has to be between 5 and 8"; |
| 168 | return false; |
| 169 | } |
| 170 | |
| 171 | if (stopbits != 1 && stopbits != 2) |
| 172 | { |
| 173 | m_error = "Stopbits has to be 1 or 2"; |
| 174 | return false; |
| 175 | } |
| 176 | |
| 177 | if (parity != PAR_NONE && parity != PAR_EVEN && parity != PAR_ODD) |
| 178 | { |
| 179 | m_error = "Parity has to be none, even or odd"; |
| 180 | return false; |
| 181 | } |
| 182 | |
| 183 | m_fd = open(name.c_str(), O_RDWR | O_NOCTTY | O_NDELAY); |
| 184 | |
| 185 | if (m_fd == -1) |
| 186 | { |
| 187 | m_error = GetErrno(); |
| 188 | return false; |
| 189 | } |
| 190 | |
| 191 | fcntl(m_fd, F_SETFL, 0); |
| 192 | |
| 193 | if (!SetBaudRate(baudrate)) |
| 194 | { |
| 195 | return false; |
| 196 | } |
| 197 | |
| 198 | m_options.c_cflag |= (CLOCAL | CREAD); |
| 199 | m_options.c_cflag &= ~HUPCL; |
| 200 | |
| 201 | m_options.c_cflag &= ~CSIZE; |
| 202 | if (databits == 5) m_options.c_cflag |= CS5; |
| 203 | if (databits == 6) m_options.c_cflag |= CS6; |
| 204 | if (databits == 7) m_options.c_cflag |= CS7; |
| 205 | if (databits == 8) m_options.c_cflag |= CS8; |
| 206 | |
| 207 | m_options.c_cflag &= ~PARENB; |
| 208 | if (parity == PAR_EVEN || parity == PAR_ODD) |
| 209 | m_options.c_cflag |= PARENB; |
| 210 | if (parity == PAR_ODD) |
| 211 | m_options.c_cflag |= PARODD; |
| 212 | |
| 213 | #ifdef CRTSCTS |
| 214 | m_options.c_cflag &= ~CRTSCTS; |
| 215 | #elif defined(CNEW_RTSCTS) |
| 216 | m_options.c_cflag &= ~CNEW_RTSCTS; |
| 217 | #endif |
| 218 | |
| 219 | if (stopbits == 1) m_options.c_cflag &= ~CSTOPB; |
| 220 | else m_options.c_cflag |= CSTOPB; |
| 221 | |
| 222 | //I guessed a little here |
| 223 | m_options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | XCASE | ECHOK | ECHONL | ECHOCTL | ECHOPRT | ECHOKE | TOSTOP); |
| 224 | |
| 225 | if (parity == PAR_NONE) |
| 226 | { |
| 227 | m_options.c_iflag &= ~INPCK; |
| 228 | } |
| 229 | else |
| 230 | { |
| 231 | m_options.c_iflag |= INPCK | ISTRIP; |
| 232 | } |
| 233 | |
| 234 | m_options.c_iflag &= ~(IXON | IXOFF | IXANY | BRKINT | INLCR | IGNCR | ICRNL | IUCLC | IMAXBEL); |
| 235 | m_options.c_oflag &= ~(OPOST | ONLCR | OCRNL); |
| 236 | |
| 237 | if (tcsetattr(m_fd, TCSANOW, &m_options) != 0) |
| 238 | { |
| 239 | m_error = GetErrno(); |
| 240 | return false; |
| 241 | } |
| 242 | |
| 243 | //non-blocking port |
| 244 | fcntl(m_fd, F_SETFL, FNDELAY); |
| 245 | |
| 246 | return true; |
| 247 | } |
| 248 | |
| 249 | void CSerialPort::Close() |
| 250 | { |
| 251 | if (m_fd != -1) |
| 252 | { |
| 253 | close(m_fd); |
| 254 | m_fd = -1; |
| 255 | m_name = ""; |
| 256 | m_error = ""; |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | bool CSerialPort::SetBaudRate(int baudrate) |
| 261 | { |
| 262 | int rate = IntToRate(baudrate); |
| 263 | if (rate == -1) |
| 264 | { |
| 265 | char buff[255]; |
| 266 | sprintf(buff, "%i is not a valid baudrate", baudrate); |
| 267 | m_error = buff; |
| 268 | return false; |
| 269 | } |
| 270 | |
| 271 | //get the current port attributes |
| 272 | if (tcgetattr(m_fd, &m_options) != 0) |
| 273 | { |
| 274 | m_error = GetErrno(); |
| 275 | return false; |
| 276 | } |
| 277 | |
| 278 | if (cfsetispeed(&m_options, rate) != 0) |
| 279 | { |
| 280 | m_error = GetErrno(); |
| 281 | return false; |
| 282 | } |
| 283 | |
| 284 | if (cfsetospeed(&m_options, rate) != 0) |
| 285 | { |
| 286 | m_error = GetErrno(); |
| 287 | return false; |
| 288 | } |
| 289 | |
| 290 | return true; |
| 291 | } |