Port expander driver first hacky version

makefiles/config_px4fmu-v2_default.mk

@@ -40,6 +40,7 @@ MODULES		+= drivers/meas_airspeed
 MODULES		+= drivers/frsky_telemetry
 MODULES		+= modules/sensors
 MODULES		+= drivers/mkblctrl
+MODULES		+= drivers/pca8574
 
 
 # Needs to be burned to the ground and re-written; for now,

makefiles/config_px4fmu-v2_test.mk

@@ -24,6 +24,7 @@ MODULES		+= drivers/lsm303d
 MODULES		+= drivers/l3gd20
 MODULES		+= drivers/hmc5883
 MODULES		+= drivers/ms5611
+MODULES		+= drivers/pca8574
 MODULES		+= systemcmds/perf
 MODULES		+= systemcmds/reboot
 MODULES		+= systemcmds/tests

src/drivers/drv_io_expander.h

@@ -0,0 +1,65 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file drv_io_expander.h
+ *
+ * IO expander device API
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <sys/ioctl.h>
+
+/*
+ * ioctl() definitions
+ */
+
+#define _IOXIOCBASE		(0x2800)
+#define _IOXIOC(_n)		(_IOC(_IOXIOCBASE, _n))
+
+/** enable the device */
+#define IOX_ENABLE		_IOXIOC(1)
+
+/** set constant values */
+#define IOX_SET_VALUE		_IOXIOC(2)
+
+/** set constant values */
+#define IOX_SET_MODE		_IOXIOC(3)
+
+/* enum passed to RGBLED_SET_MODE ioctl()*/
+enum IOX_MODE {
+	IOX_MODE_OFF,
+	IOX_MODE_ON
+};

src/drivers/pca8574/module.mk

@@ -0,0 +1,6 @@
+#
+# PCA8574 driver for RGB LED
+#
+
+MODULE_COMMAND	 = pca8574
+SRCS		 = pca8574.cpp