93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
// Copyright 2011 Juri Glass, Mathias Runge, Nadim El Sayed
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// DAI-Labor, TU-Berlin
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//
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// This file is part of libSML.
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//
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// libSML is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// libSML is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with libSML. If not, see <http://www.gnu.org/licenses/>.
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <termios.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sml/sml_file.h>
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#include <sml/sml_transport.h>
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int serial_port_open(const char* device) {
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int bits;
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struct termios config;
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memset(&config, 0, sizeof(config));
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int fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
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if (fd < 0) {
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printf("error: open(%s): %s\n", device, strerror(errno));
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return -1;
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}
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// set RTS
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ioctl(fd, TIOCMGET, &bits);
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bits |= TIOCM_RTS;
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ioctl(fd, TIOCMSET, &bits);
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tcgetattr( fd, &config ) ;
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// set 8-N-1
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config.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
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config.c_oflag &= ~OPOST;
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config.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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config.c_cflag &= ~(CSIZE | PARENB | PARODD | CSTOPB);
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config.c_cflag |= CS8;
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// set speed to 9600 baud
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cfsetispeed( &config, B9600);
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cfsetospeed( &config, B9600);
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tcsetattr(fd, TCSANOW, &config);
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return fd;
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}
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void transport_receiver(unsigned char *buffer, size_t buffer_len) {
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// the buffer contains the whole message, with transport escape sequences.
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// these escape sequences are stripped here.
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sml_file *file = sml_file_parse(buffer + 8, buffer_len - 16);
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// the sml file is parsed now
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// read here some values ..
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// this prints some information about the file
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sml_file_print(file);
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// free the malloc'd memory
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sml_file_free(file);
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}
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int main(int argc, char **argv) {
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// this example assumes that a EDL21 meter sending SML messages via a
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// serial device. Adjust as needed.
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char *device = "/dev/cu.usbserial";
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int fd = serial_port_open(device);
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if (fd > 0) {
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// listen on the serial device, this call is blocking.
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sml_transport_listen(fd, &transport_receiver);
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close(fd);
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}
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return 0;
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}
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