264 lines
7.4 KiB
C
264 lines
7.4 KiB
C
/*
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Cross-platform serial / RS232 library
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Version 0.21, 11/10/2015
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-> LINUX and MacOS implementation
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-> rs232-linux.c
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The MIT License (MIT)
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Copyright (c) 2013-2015 Frédéric Meslin, Florent Touchard
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Email: fredericmeslin@hotmail.com
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Website: www.fredslab.net
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Twitter: @marzacdev
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#if defined(__unix__) || defined(__unix) || \
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defined(__APPLE__) && defined(__MACH__)
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#define _DARWIN_C_SOURCE
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#include "rs232.h"
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#include <unistd.h>
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#ifndef __USE_MISC
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#define __USE_MISC // For CRTSCTS
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#endif
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#include <termios.h>
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#include <fcntl.h>
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#include <dirent.h>
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#define __USE_SVID // For strdup
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/*****************************************************************************/
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/** Base name for COM devices */
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#if defined(__APPLE__) && defined(__MACH__)
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static const char * devBases[] = {
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"tty."
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};
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static int noBases = 1;
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#else
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static const char * devBases[] = {
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"ttyACM", "ttyUSB", "rfcomm", "ttyS"
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};
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static int noBases = 4;
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#endif
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/*****************************************************************************/
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typedef struct {
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char * port;
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int handle;
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} COMDevice;
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#define COM_MAXDEVICES 64
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static COMDevice comDevices[COM_MAXDEVICES];
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static int noDevices = 0;
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/*****************************************************************************/
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/** Private functions */
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void _AppendDevices(const char * base);
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int _BaudFlag(int BaudRate);
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/*****************************************************************************/
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int comEnumerate()
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{
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for (int i = 0; i < noDevices; i++) {
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if (comDevices[i].port) free(comDevices[i].port);
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comDevices[i].port = NULL;
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}
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noDevices = 0;
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for (int i = 0; i < noBases; i++)
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_AppendDevices(devBases[i]);
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return noDevices;
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}
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void comTerminate()
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{
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comCloseAll();
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for (int i = 0; i < noDevices; i++) {
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if (comDevices[i].port) free(comDevices[i].port);
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comDevices[i].port = NULL;
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}
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}
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int comGetNoPorts()
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{
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return noDevices;
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}
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/*****************************************************************************/
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int comFindPort(const char * name)
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{
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int p;
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for (p = 0; p < noDevices; p++)
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if (strcmp(name, comDevices[p].port) == 0)
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return p;
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return -1;
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}
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const char * comGetInternalName(int index)
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{
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#define COM_MAXNAME 128
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static char name[COM_MAXNAME];
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if (index >= noDevices || index < 0)
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return NULL;
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sprintf(name, "/dev/%s", comDevices[index].port);
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return name;
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}
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const char * comGetPortName(int index) {
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if (index >= noDevices || index < 0)
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return NULL;
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return comDevices[index].port;
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}
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/*****************************************************************************/
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int comOpen(int index, int baudrate)
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{
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if (index >= noDevices || index < 0)
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return 0;
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// Close if already open
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COMDevice * com = &comDevices[index];
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if (com->handle >= 0) comClose(index);
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// Open port
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printf("Try %s \n", comGetInternalName(index));
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int handle = open(comGetInternalName(index), O_RDWR | O_NOCTTY | O_NDELAY);
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if (handle < 0)
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return 0;
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printf("Open %s \n", comGetInternalName(index));
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// General configuration
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struct termios config;
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memset(&config, 0, sizeof(config));
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tcgetattr(handle, &config);
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config.c_iflag &= ~(INLCR | ICRNL);
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config.c_iflag |= IGNPAR | IGNBRK;
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config.c_oflag &= ~(OPOST | ONLCR | OCRNL);
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config.c_cflag &= ~(PARENB | PARODD | CSTOPB | CSIZE | CRTSCTS);
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config.c_cflag |= CLOCAL | CREAD | CS8;
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config.c_lflag &= ~(ICANON | ISIG | ECHO);
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int flag = _BaudFlag(baudrate);
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cfsetospeed(&config, flag);
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cfsetispeed(&config, flag);
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// Timeouts configuration
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config.c_cc[VTIME] = 1;
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config.c_cc[VMIN] = 0;
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//fcntl(handle, F_SETFL, FNDELAY);
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// Validate configuration
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if (tcsetattr(handle, TCSANOW, &config) < 0) {
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close(handle);
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return 0;
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}
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com->handle = handle;
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return 1;
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}
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void comClose(int index)
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{
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if (index >= noDevices || index < 0)
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return;
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COMDevice * com = &comDevices[index];
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if (com->handle < 0)
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return;
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tcdrain(com->handle);
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close(com->handle);
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com->handle = -1;
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}
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void comCloseAll()
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{
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for (int i = 0; i < noDevices; i++)
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comClose(i);
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}
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/*****************************************************************************/
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int comWrite(int index, const char * buffer, size_t len)
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{
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if (index >= noDevices || index < 0)
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return 0;
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if (comDevices[index].handle <= 0)
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return 0;
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int res = write(comDevices[index].handle, buffer, len);
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if (res < 0)
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res = 0;
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return res;
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}
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int comRead(int index, char * buffer, size_t len)
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{
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if (index >= noDevices || index < 0)
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return 0;
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if (comDevices[index].handle <= 0)
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return 0;
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int res = read(comDevices[index].handle, buffer, len);
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if (res < 0)
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res = 0;
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return res;
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}
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/*****************************************************************************/
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int _BaudFlag(int BaudRate)
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{
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switch(BaudRate)
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{
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case 50: return B50; break;
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case 110: return B110; break;
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case 134: return B134; break;
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case 150: return B150; break;
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case 200: return B200; break;
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case 300: return B300; break;
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case 600: return B600; break;
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case 1200: return B1200; break;
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case 1800: return B1800; break;
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case 2400: return B2400; break;
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case 4800: return B4800; break;
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case 9600: return B9600; break;
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case 19200: return B19200; break;
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case 38400: return B38400; break;
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case 57600: return B57600; break;
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case 115200: return B115200; break;
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case 230400: return B230400; break;
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default : return B0; break;
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}
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}
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void _AppendDevices(const char * base)
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{
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size_t baseLen = strlen(base);
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struct dirent * dp;
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// Enumerate devices
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DIR * dirp = opendir("/dev");
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while ((dp = readdir(dirp)) && noDevices < COM_MAXDEVICES) {
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if (strlen(dp->d_name) >= baseLen) {
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if (memcmp(base, dp->d_name, baseLen) == 0) {
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COMDevice * com = &comDevices[noDevices ++];
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com->port = (char *) strdup(dp->d_name);
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com->handle = -1;
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}
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}
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}
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closedir(dirp);
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}
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#endif // unix
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