2 * Copyright (C) 2009 Nils Faerber <nils.faerber@kernelconcepts.de>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 int open_uart(char *device, speed_t baud)
35 device = "/dev/ttyS0";
36 fd = open(device, O_RDWR | O_NOCTTY);
38 fprintf(stderr, "Can't open serial port: %s (%d)\n", strerror(errno), errno);
42 tcflush(fd, TCIOFLUSH);
43 if (tcgetattr(fd, &ti) < 0) {
44 fprintf(stderr, "Can't get port settings: %s (%d)\n", strerror(errno), errno);
51 ti.c_cflag &= ~CRTSCTS;
52 //ti.c_cflag |= CRTSCTS;
53 //ti.c_cflag |= PARENB;
59 cfsetospeed(&ti, baud);
60 if (tcsetattr(fd, TCSANOW, &ti) < 0) {
61 fprintf(stderr, "Can't change port settings: %s (%d)\n", strerror(errno), errno);
66 tcflush(fd, TCIOFLUSH);
67 if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK) < 0) {
68 fprintf(stderr, "Can't set non blocking mode: %s (%d)\n", strerror(errno), errno);
81 void put_uart(uint8_t ch)
83 if (write(fd, &ch, 1) < 0)
84 fprintf(stderr, "UART write error\n");
87 void write_uart(char *buf, int size)
93 ret = write(fd, buf, size);
95 fprintf(stderr, "UART write error\n");
98 } while (remain && (ret>=0));
101 uint8_t get_uart(uint8_t *ch)
103 int res = read(fd, ch, 1);
104 return res > 0 ? res : 0;
107 int uart_read(char *rxbuf, int maxlen)
109 return read(fd, rxbuf, maxlen);
112 void close_uart(void)