117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
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/*
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* Copyright (C) 2009 Nicole Faerber <nicole.faerber@dpin.de>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdint.h>
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#include <termios.h>
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static int fd = -1;
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int open_uart(char *device, speed_t baud)
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{
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struct termios ti;
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if (!device)
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device = "/dev/ttyS0";
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fd = open(device, O_RDWR | O_NOCTTY);
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if (fd < 0) {
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fprintf(stderr, "Can't open serial port '%s': %s (%d)\n", device, strerror(errno), errno);
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fd = -1;
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return -1;
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}
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tcflush(fd, TCIOFLUSH);
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if (tcgetattr(fd, &ti) < 0) {
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fprintf(stderr, "Can't get port settings: %s (%d)\n", strerror(errno), errno);
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close(fd);
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fd = -1;
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return -1;
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}
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cfmakeraw(&ti);
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ti.c_cflag |= CLOCAL;
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ti.c_cflag &= ~CRTSCTS;
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//ti.c_cflag |= CRTSCTS;
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//ti.c_cflag |= PARENB;
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ti.c_cflag |= IGNBRK;
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ti.c_cc[VMIN] = 1;
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ti.c_cc[VTIME] = 0;
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if (baud == 0)
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baud = B115200;
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cfsetospeed(&ti, baud);
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if (tcsetattr(fd, TCSANOW, &ti) < 0) {
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fprintf(stderr, "Can't change port settings: %s (%d)\n", strerror(errno), errno);
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close(fd);
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fd = -1;
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return -1;
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}
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tcflush(fd, TCIOFLUSH);
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if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK) < 0) {
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fprintf(stderr, "Can't set non blocking mode: %s (%d)\n", strerror(errno), errno);
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close(fd);
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fd = -1;
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return -1;
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}
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return 0;
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}
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int uart_get_fd(void)
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{
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return fd;
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}
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void put_uart(uint8_t ch)
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{
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if (write(fd, &ch, 1) < 0)
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fprintf(stderr, "UART write error\n");
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}
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void write_uart(char *buf, int size)
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{
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int remain = size;
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int ret;
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do {
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ret = write(fd, buf, size);
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if (ret < 0)
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fprintf(stderr, "UART write error\n");
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remain -= ret;
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buf += ret;
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} while (remain && (ret>=0));
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}
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uint8_t get_uart(uint8_t *ch)
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{
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int res = read(fd, ch, 1);
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return res > 0 ? res : 0;
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}
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int uart_read(char *rxbuf, int maxlen)
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{
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return read(fd, rxbuf, maxlen);
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}
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void close_uart(void)
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{
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close(fd);
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fd = -1;
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}
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