From a42ec7df1b417a34e072a68c6e34240a97d5ba80 Mon Sep 17 00:00:00 2001
From: Lorenz Meier <lm@inf.ethz.ch>
Date: Tue, 8 Jul 2014 13:50:24 +0200
Subject: [PATCH] MS5611: Deal with missing external bus

---
 src/drivers/ms5611/ms5611_spi.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/drivers/ms5611/ms5611_spi.cpp b/src/drivers/ms5611/ms5611_spi.cpp
index 00d016aed3..5234ce8d6b 100644
--- a/src/drivers/ms5611/ms5611_spi.cpp
+++ b/src/drivers/ms5611/ms5611_spi.cpp
@@ -118,7 +118,11 @@ device::Device *
 MS5611_spi_interface(ms5611::prom_u &prom_buf, bool external_bus)
 {
 	if (external_bus) {
+		#ifdef PX4_SPI_BUS_EXT
 		return new MS5611_SPI(PX4_SPI_BUS_EXT, (spi_dev_e)PX4_SPIDEV_EXT_BARO, prom_buf);
+		#else
+		return nullptr;
+		#endif
 	} else {
 		return new MS5611_SPI(PX4_SPI_BUS_SENSORS, (spi_dev_e)PX4_SPIDEV_BARO, prom_buf);
 	}