153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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int set_interface_attribs(int fd, int speed)
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{
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struct termios tty;
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if (tcgetattr(fd, &tty) < 0)
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{
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printf("Error from tcgetattr: %s\n", strerror(errno));
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return -1;
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}
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cfsetospeed(&tty, (speed_t)speed);
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cfsetispeed(&tty, (speed_t)speed);
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tty.c_cflag |= (CLOCAL | CREAD); /* ignore modem controls */
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tty.c_cflag &= ~CSIZE;
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tty.c_cflag |= CS8; /* 8-bit characters */
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tty.c_cflag &= ~PARENB; /* no parity bit */
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tty.c_cflag &= ~CSTOPB; /* only need 1 stop bit */
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tty.c_cflag &= ~CRTSCTS; /* no hardware flowcontrol */
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/* setup for non-canonical mode */
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tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY);
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tty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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tty.c_oflag &= ~OPOST;
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/* fetch bytes as they become available */
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tty.c_cc[VMIN] = 0;
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tty.c_cc[VTIME] = 0;
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if (tcsetattr(fd, TCSANOW, &tty) != 0)
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{
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printf("Error from tcsetattr: %s\n", strerror(errno));
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return -1;
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}
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return 0;
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}
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void set_mincount(int fd, int mcount)
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{
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struct termios tty;
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if (tcgetattr(fd, &tty) < 0)
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{
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printf("Error tcgetattr: %s\n", strerror(errno));
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return;
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}
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tty.c_cc[VMIN] = mcount ? 1 : 0;
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tty.c_cc[VTIME] = 5; /* half second timer */
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if (tcsetattr(fd, TCSANOW, &tty) < 0)
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printf("Error tcsetattr: %s\n", strerror(errno));
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}
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void print_attributes(int fd )
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{
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struct termios attr;
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if(tcgetattr(fd,&attr) == -1)
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printf("tcgetattr failed.");
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printf("ibaud:%i",cfgetispeed(&attr));
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printf("obaud:%i",cfgetospeed(&attr));
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}
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int main()
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{
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char *portname = "/dev/ttyACM0";
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int fd;
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int wlen;
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fd = open(portname, O_RDWR | O_NOCTTY | O_SYNC);
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if (fd < 0)
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{
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printf("Error opening %s: %s\n", portname, strerror(errno));
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return -1;
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}
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/*baudrate 115200, 8 bits, no parity, 1 stop bit */
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set_interface_attribs(fd, B38400);
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//set_mincount(fd, 0); /* set to pure timed read */
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print_attributes(fd);
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unsigned char buf[80];
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buf[0] = '0';
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printf("Reading\n");
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/* simple noncanonical input */
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do
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{
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int rdlen;
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int displayStringFl = 0;
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/* simple output */
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wlen = write(fd, buf, 1);
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if (wlen != 1)
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{
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printf("Error from write: %d, %d\n", wlen, errno);
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}
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tcdrain(fd); /* delay for output */
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//rdlen = read(fd, buf, sizeof(buf) - 1);
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rdlen = read(fd, buf, 1);
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printf(".");
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if (rdlen > 0)
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{
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printf("rdlen:%i\n",rdlen);
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if(displayStringFl)
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{
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buf[rdlen] = 0;
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printf("Read %d: \"%s\"\n", rdlen, buf);
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}
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else
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{
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unsigned char *p;
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printf("Read %d:", rdlen);
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for (p = buf; rdlen-- > 0; p++)
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printf(" 0x%x", *p);
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printf("\n");
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}
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}
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else
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if (rdlen < 0)
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{
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printf("Error from read: %d: %s\n", rdlen, strerror(errno));
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}
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sleep(1);
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/* repeat read to get full message */
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} while (1);
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}
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