Snapdragon RC pwm: Only reserve one MAVLink buffer

src/drivers/snapdragon_rc_pwm/CMakeLists.txt

@@ -35,6 +35,7 @@ px4_add_module(
 	MAIN snapdragon_rc_pwm
 	COMPILE_FLAGS
 		-Os
+		-DMAVLINK_COMM_NUM_BUFFERS=1
 	SRCS
 		snapdragon_rc_pwm.cpp
 	DEPENDS

src/drivers/snapdragon_rc_pwm/snapdragon_rc_pwm.cpp

@@ -52,6 +52,7 @@
 #include <termios.h>
 #include <uORB/topics/input_rc.h>
 #include <uORB/topics/actuator_controls.h>
+
 #include <v1.0/mavlink_types.h>
 #include <v1.0/common/mavlink.h>
 
@@ -155,7 +156,7 @@ void task_main(int argc, char *argv[])
 				mavlink_message_t msg;
 
 				for (int i = 0; i < len; ++i) {
-					if (mavlink_parse_char(MAVLINK_COMM_1, serial_buf[i], &msg, &serial_status)) {
+					if (mavlink_parse_char(MAVLINK_COMM_0, serial_buf[i], &msg, &serial_status)) {
 						// have a message, handle it
 						handle_message(&msg);
 					}