i2c_spi_buses: improve info output for external buses

platforms/common/i2c_spi_buses.cpp

@@ -392,6 +392,19 @@ bool BusInstanceIterator::external() const
 	}
 }
 
+int BusInstanceIterator::externalBusIndex() const
+{
+	if (busType() == BOARD_INVALID_BUS) {
+		return 0;
+
+	} else if (busType() == BOARD_SPI_BUS) {
+		return _spi_bus_iterator.externalBusIndex();
+
+	} else {
+		return _i2c_bus_iterator.externalBusIndex();
+	}
+}
+
 I2CBusIterator::FilterType BusInstanceIterator::i2cFilter(I2CSPIBusOption bus_option)
 {
 	switch (bus_option) {
@@ -486,14 +499,28 @@ int I2CSPIDriverBase::module_start(const BusCLIArguments &cli, BusInstanceIterat
 		// print some info that we are running
 		switch (iterator.busType()) {
 		case BOARD_I2C_BUS:
-			PX4_INFO_RAW("%s #%i on I2C bus %d%s\n",
-				     instance->ItemName(), runtime_instance, iterator.bus(), iterator.external() ? " (external)" : "");
+			PX4_INFO_RAW("%s #%i on I2C bus %d", instance->ItemName(), runtime_instance, iterator.bus());
+
+			if (iterator.external()) {
+				PX4_INFO_RAW(" (external, equal to '-b %i')\n", iterator.externalBusIndex());
+
+			} else {
+				PX4_INFO_RAW("\n");
+			}
+
 			break;
 
 		case BOARD_SPI_BUS:
-			PX4_INFO_RAW("%s #%i on SPI bus %d (devid=0x%x)%s\n",
-				     instance->ItemName(), runtime_instance, iterator.bus(), PX4_SPI_DEV_ID(iterator.devid()),
-				     iterator.external() ? " (external)" : "");
+			PX4_INFO_RAW("%s #%i on SPI bus %d (devid=0x%x)",
+				     instance->ItemName(), runtime_instance, iterator.bus(), PX4_SPI_DEV_ID(iterator.devid()));
+
+			if (iterator.external()) {
+				PX4_INFO_RAW(" (external, equal to '-b %i')\n", iterator.externalBusIndex());
+
+			} else {
+				PX4_INFO_RAW("\n");
+			}
+
 			break;
 
 		case BOARD_INVALID_BUS:

platforms/common/include/px4_platform_common/i2c.h

@@ -89,6 +89,8 @@ public:
 
 	const px4_i2c_bus_t &bus() const { return px4_i2c_buses[_index]; }
 
+	int externalBusIndex() const { return _external_bus_counter; }
+
 	bool external() const { return px4_i2c_bus_external(bus()); }
 
 private:

platforms/common/include/px4_platform_common/i2c_spi_buses.h

@@ -153,6 +153,7 @@ public:
 	uint32_t devid() const;
 	spi_drdy_gpio_t DRDYGPIO() const;
 	bool external() const;
+	int externalBusIndex() const;
 
 	void addInstance(I2CSPIInstance *instance);
 

platforms/common/include/px4_platform_common/spi.h

@@ -154,6 +154,8 @@ public:
 
 	uint32_t devid() const { return px4_spi_buses[_index].devices[_bus_device_index].devid; }
 
+	int externalBusIndex() const { return _external_bus_counter; }
+
 	bool external() const { return px4_spi_bus_external(bus()); }
 
 private: