gistfile1.txt

#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <time.h>
#include <string.h>

int main(int argc, char *argv[])
{
	char *uart = argv[1];
	struct termios t;
	struct timeval start, end;
	int fd, ret;
	char *buf = "abcdefghijklmnopqrs\n";
	int count;
	int len = strlen(buf);

	printf("%s\n", uart);

	fd = open(uart, O_RDWR);
	assert(fd >= 0);

	ret = tcgetattr(fd, &t);
	assert(ret == 0);

	cfsetispeed(&t, B57600);
	cfsetospeed(&t, B57600);

	ret = tcsetattr(fd, TCSANOW, &t);
	assert(ret == 0);

	count = 0;
	while(1)
	{
		struct timespec ts = {
			.tv_sec = 0,
			.tv_nsec = 16 * 1000 * 1000,
		};
		write(fd, buf, len);
		nanosleep(&ts, NULL);
		count++;
		if (count % 100 == 0)
			printf("Sent %d packets\n", count);
	}

	return 0;
}