sirfmon now switches speed using the driver method.

The trick was to insert the right tcdrain() and delay combination
before changing the tty parameters,. otherwise the control message
gets trashed in the UART buffer when the baud rate change comes down.

Put a similar delay after the gpsctl call.  Probably not needed, but
it can't hurt...

1 files changed, 8 insertions, 1 deletions

diff --git a/gpsctl.c b/gpsctl.c
index b5b0cfcc..6ff16988 100644
--- a/gpsctl.c
+++ b/gpsctl.c
@@ -443,8 +443,15 @@ int main(int argc, char **argv)
 			    session.device_type->type_name);
 		status = 1;
 	    }
-	    else if (!session.device_type->speed_switcher(&session, 
+	    else if (session.device_type->speed_switcher(&session, 
 							  (speed_t)atoi(speed))) {
+		/*
+		 * See the comment attached to the 'B' command in gpsd.
+		 * Probably not needed here, but it can't hurt.
+		 */
+		(void)tcdrain(session.gpsdata.gps_fd);
+		(void)usleep(50000);
+	    } else {
 		gpsd_report(LOG_ERROR, "speed change failed.\n");
 		status = 1;
 	    }