main.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <locale.h>
#include <termios.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdbool.h>
#include <unistd.h>

/* #include "gui.h" */

int configure_interface(int fd) {
	struct termios tty;

	memset(&tty, 0, sizeof(tty));

	// Get the current options for the port.
	if (tcgetattr(fd, &tty) != 0) {
		fprintf(stderr, "error %d from tcgetattr: %s\n", errno, strerror(errno));
		return -1;
	}

	// Set the baud rates to 19200
	/* cfsetispeed(&tty, B9600); */
	/* cfsetospeed(&tty, B9600); */

	/* tcflush(fd, TCIFLUSH); */

	tcflush(fd, TCIFLUSH);
	// INPCK added....
	tty.c_cflag = B9600 | CS8 | CSTOPB | CREAD | CLOCAL | HUPCL | INPCK;
	tty.c_lflag &= ~(ECHO | ECHONL | ICANON);
	tty.c_cc[VTIME] = 10;
	tty.c_cc[VMIN] = 1;
	cfsetispeed(&tty, B9600);
	cfsetospeed(&tty, B9600);

	/* tty.c_cflag      = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit chars */
	/* tty.c_iflag     &= ~IGNBRK;                      // disable break processing */
	/* tty.c_lflag      = 0;                            // no signaling chars, no echo, no canonical processing */
	/* tty.c_oflag      = 0;                            // no remapping, no delays */
	/* tty.c_cc[VMIN]   = 0;                            // XXX: read doesn't block */
	/* tty.c_cc[VTIME]  = 5;                            // XXX: 0.5 seconds read timeout */

	/* tty.c_iflag     &= ~(IXON | IXOFF | IXANY);      // shut off xon/xoff ctrl */
	/* tty.c_cflag     |= (CLOCAL | CREAD);             // ignore modem controls, enable reading */
	/* tty.c_cflag     &= ~(PARENB | PARODD | CSTOPB);  // disable parity */

	if (tcsetattr(fd, TCSANOW, &tty) != 0) {
		fprintf(stderr, "error %d from tcsetattr: %s\n", errno, strerror(errno));
		return -1;
	}

	return 0;
}

int main(int argc, char *argv[]) {
	/* gui_loop(); */

	char *portname = "/dev/ttyUSB0";
	int fd = open(portname, O_RDWR /* | O_NOCTTY  | O_SYNC */);
	if (fd < 0) {
		fprintf(stderr, "error %d opening %s: %s", errno, portname, strerror(errno));
		return EXIT_FAILURE;
	}

	if (configure_interface(fd) != 0)
		return EXIT_FAILURE;

	/* bool buf[4]; */
	/* uint8_t buf = 0; */
	int n = 0;
	uint8_t data = 1;
	(void)data;
	uint8_t buf;
	(void)buf;
	/* int i = 0, n = 0; */
	/* memset(buf, '\0', sizeof(buf)); */

	while (true) {
		n = write(fd, &data, sizeof(data));
		if (n == 0)
			fprintf(stderr, "error: wrote 0 byte(s)!\n");
		else
			printf("wrote %d byte(s)\n", n);


		/* n = read(fd, &buf, sizeof(uint8_t)); */
		/* (void)n; */
		/* printf("read: %d\n", buf); */

		sleep(1);
	}

	close(fd);
	return EXIT_SUCCESS;
}

// vim: noexpandtab