sdp3x: stop continuous measurement while reconfig

src/drivers/differential_pressure/sdp3x/SDP3X.cpp

@@ -72,7 +72,12 @@ SDP3X::init_sdp3x()
 int
 SDP3X::configure()
 {
-	int ret = write_command(SDP3X_CONT_MEAS_AVG_MODE);
+	int ret = write_command(SDP3X_CONT_MODE_STOP);
+
+	if (ret == PX4_OK) {
+		px4_udelay(500); // SDP3X is unresponsive for 500us after stop continuous measurement command
+		ret = write_command(SDP3X_CONT_MEAS_AVG_MODE);
+	}
 
 	if (ret != PX4_OK) {
 		perf_count(_comms_errors);

src/drivers/differential_pressure/sdp3x/SDP3X.hpp

@@ -56,6 +56,7 @@
 #define SDP3X_RESET_ADDR		0x00
 #define SDP3X_RESET_CMD			0x06
 #define SDP3X_CONT_MEAS_AVG_MODE	0x3615
+#define SDP3X_CONT_MODE_STOP		0x3FF9
 
 #define SDP3X_SCALE_PRESSURE_SDP31	60
 #define SDP3X_SCALE_PRESSURE_SDP32	240