Add help and check for serial port

alvieboy · Oct 30, 2009 · 43812f1 · 43812f1
1 parent bea1799
commit 43812f1
Showing 1 changed file with 14 additions and 1 deletion.
diff --git a/UI/display.c b/UI/display.c
@@ -121,12 +121,25 @@ gboolean vref_changed(GtkWidget *widget)
 	return TRUE;
 }
 
+int help(char*cmd)
+{
+	printf("Usage: %s serialport\n\n",cmd);
+	printf("  example: %s /dev/ttyUSB0\n\n",cmd);
+	return -1;
+}
+
 int main(int argc,char **argv)
 {
 	GtkWidget*scale_zoom;
 	gtk_init(&argc,&argv);
 	unsigned char data[512];
-	serial_init(argv[1]);
+
+	if (argc<2)
+		return help(argv[0]);
+
+	if (serial_init(argv[1])<0)
+		return -1;
+
 	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);