From 8679629f8c9f6a45b3b44ca2f2f613232b7607dd Mon Sep 17 00:00:00 2001
From: Pavel Vymetálek <pavel@vym.cz>
Date: Wed, 20 Jan 2021 10:48:34 +0100
Subject: Port initialization changes for MAC OS

---
 sercp.c | 47 ++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 36 insertions(+), 11 deletions(-)

diff --git a/sercp.c b/sercp.c
index f85871b..f19fea4 100644
--- a/sercp.c
+++ b/sercp.c
@@ -18,6 +18,10 @@
 /*
  * IFDEFS inspired here:
  * https://iq.opengenus.org/detect-operating-system-in-c/
+ *
+ *  vmin, vtime insipired here:
+ * 	// http://unixwiz.net/techtips/termios-vmin-vtime.html
+ *
  */
 
 #ifdef _WIN32
@@ -162,7 +166,7 @@ void TestArgs (int argc, char *argv[])
 		};
 		c = getopt_long (argc, argv, "d:b:w:rvh", long_options, &option_index);
 		if (c == -1) {
-			// konec parametru
+			// end of arguments
 			break;
 		}
 		switch (c) {
@@ -172,7 +176,6 @@ void TestArgs (int argc, char *argv[])
 #else
 				sprintf(SERIALDEVICE, "%s", optarg);
 #endif
-//				printf ("Serial port: %s\n", SERIALDEVICE);
 				break;
 			case 'b':
 				baud_rate = atoi(optarg);
@@ -656,8 +659,10 @@ void sercpSend(void) {
 		}
 	}
 	printf("\nFile sent...\n");
-	// FIXME na __APPLE__ tady pomaha pockat
-	// sleep_ms(5000);
+#ifdef __APPLE__
+	// FIXME on __APPLE__ this waiting helps
+	sleep_ms(wait_ms);
+#endif
 	fclose(tap_fd);
 }
 
@@ -705,11 +710,30 @@ int OpenUart() {
 #else
 	struct termios oldtio, newtio;
 	/* open the device to be non-blocking (read will return immediatly) */
-	serial_fd = open(SERIALDEVICE, O_RDWR | O_NOCTTY | O_NONBLOCK | O_NDELAY);
+	serial_fd = open(SERIALDEVICE, O_RDWR | O_NOCTTY | O_NONBLOCK);	 	//	| O_NDELAY
 	if (serial_fd < 0) {
 		perror(SERIALDEVICE);
 		return(-1);
 	}
+#ifdef __APPLE__
+	// Note that open() follows POSIX semantics: multiple open() calls to the same file will succeed
+	// unless the TIOCEXCL ioctl is issued. This will prevent additional opens except by root-owned
+	// processes.
+	// See tty(4) <x-man-page//4/tty> and ioctl(2) <x-man-page//2/ioctl> for details.
+	if (ioctl(serial_fd, TIOCEXCL) == -1) {
+		printf("Error setting TIOCEXCL on %s - %s(%d).\n", SERIALDEVICE, strerror(errno), errno);
+		return (-1);
+	}
+
+	// Now that the device is open, clear the O_NONBLOCK flag so subsequent I/O will block.
+	// See fcntl(2) <x-man-page//2/fcntl> for details.
+	if (fcntl(serial_fd, F_SETFL, 0) == -1) {
+		printf("Error clearing O_NONBLOCK %s - %s(%d).\n", SERIALDEVICE, strerror(errno), errno);
+		return (-1);
+	}
+
+
+#endif
 	tcgetattr(serial_fd, &oldtio); /* save current port settings */
 	bzero(&newtio, sizeof (newtio));
 	cfmakeraw(&newtio);
@@ -743,19 +767,21 @@ int OpenUart() {
       newtio.c_cflag = B38400;
       break;
 	}
-	cfsetspeed(&newtio, baud_rate);
+	cfsetospeed(&newtio, baud_rate);
+	cfsetispeed(&newtio, baud_rate);		// set ispeed same as ospeed (see POSIX)
 #if defined (__APPLE__) || defined (BSD)
-// 	newtio.c_cflag |= CS8 | CLOCAL | CREAD | CCTS_OFLOW | CRTS_IFLOW;
-	newtio.c_cflag |= CS8 | CLOCAL | CREAD;
+	newtio.c_cflag |= CS8 | CLOCAL | CREAD | CCTS_OFLOW | CRTS_IFLOW | HUPCL;
 #else
 	newtio.c_cflag |= CS8 | CLOCAL | CREAD | CRTSCTS;
 #endif
 	newtio.c_iflag &= ~(IXON | IXOFF | IXANY);
 	newtio.c_oflag &= ~(OPOST);
+	newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);		// raw input
 	printf ("Serial device: %s, communication speed is: %d Bd\n", SERIALDEVICE, baud_rate);
+
 	// http://unixwiz.net/techtips/termios-vmin-vtime.html
-	newtio.c_cc[VMIN] = 0;
-	newtio.c_cc[VTIME] = 0;
+	newtio.c_cc[VMIN] = 1;	// minimum number to read
+	newtio.c_cc[VTIME] = 1; // time to wait
 	tcsetattr(serial_fd, TCSANOW, &newtio);
 	sleep_ms(20);
 	tcflush(serial_fd, TCIOFLUSH);
@@ -765,7 +791,6 @@ int OpenUart() {
 
 
 
-
 /************************************************************************/
 /************************************************************************/
 int main(int argc, char** argv, char** env)
-- 
cgit