--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/serial/serport.c	Sat Mar 20 19:19:46 2021 +0000
@@ -0,0 +1,57 @@
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <asm/ioctls.h>
+#include <asm/termbits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int target_fd;
+
+open_serial_port(ttyport)
+	char *ttyport;
+{
+	target_fd = open(ttyport, O_RDWR|O_NONBLOCK);
+	if (target_fd < 0) {
+		perror(ttyport);
+		exit(1);
+	}
+	ioctl(target_fd, TIOCEXCL);
+	return 0;
+}
+
+set_serial_params(br)
+{
+	struct termios2 target_termios;
+
+	target_termios.c_iflag = IGNBRK;
+	target_termios.c_oflag = 0;
+	target_termios.c_cflag = BOTHER|CLOCAL|HUPCL|CREAD|CS8|CSTOPB|PARENB;
+	target_termios.c_lflag = 0;
+	target_termios.c_cc[VMIN] = 1;
+	target_termios.c_cc[VTIME] = 0;
+	target_termios.c_ispeed = br;
+	target_termios.c_ospeed = br;
+	if (ioctl(target_fd, TCSETSF2, &target_termios) < 0) {
+		perror("TCSETSF2");
+		exit(1);
+	}
+	return 0;
+}
+
+set_serial_nonblock(state)
+	int state;
+{
+	ioctl(target_fd, FIONBIO, &state);
+}
+
+serial_card_reset()
+{
+	int mctl_arg = TIOCM_DTR | TIOCM_RTS;
+
+	ioctl(target_fd, TIOCMBIS, &mctl_arg);
+	usleep(20000);
+	ioctl(target_fd, TCFLSH, TCIFLUSH);
+	ioctl(target_fd, TIOCMBIC, &mctl_arg);
+}