1 files changed, 100 insertions, 0 deletions
diff --git a/nuttx/configs/px4io/include/drv_ppm_input.h b/nuttx/configs/px4io/include/drv_ppm_input.h
new file mode 100644
index 000000000..78c424154
--- /dev/null
+++ b/nuttx/configs/px4io/include/drv_ppm_input.h
@@ -0,0 +1,100 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 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 PPM input decoder.
+ *
+ * Works in conjunction with the HRT driver, exports a device node
+ * and a message queue (if message queues are enabled).
+ *
+ * Note that the device node supports both blocking and non-blocking
+ * opens, but actually never blocks.  A nonblocking open will return
+ * EWOULDBLOCK if there has not been an update since the last read,
+ * while a blocking open will always return the most recent data.
+ */
+
+#include <sys/ioctl.h>
+
+#define _PPM_INPUT_BASE		0x7600
+
+/*
+ * Fetch the state of the PPM input detector.
+ */
+#define PPM_INPUT_STATUS	_IOC(_PPM_INPUT_BASE, 0)
+
+typedef enum {
+	PPM_STATUS_NO_SIGNAL		= 0,
+	PPM_STATUS_SIGNAL_CURRENT	= 1,
+} ppm_input_status_t;
+
+/*
+ * Fetch the number of channels decoded (only valid when PPM_STATUS_SIGNAL_CURRENT).
+ */
+#define PPM_INPUT_CHANNELS	_IOC(_PPM_INPUT_BASE, 1)
+
+typedef int ppm_input_channel_count_t;
+
+/*
+ * Device node
+ */
+#define PPM_DEVICE_NODE		"/dev/ppm_input"
+
+/*
+ * Message queue; if message queues are supported, PPM input data is
+ * supplied to the queue when a frame is decoded.
+ */
+#ifndef CONFIG_DISABLE_MQUEUE
+# define PPM_MESSAGE_QUEUE	"ppm_input"
+#endif
+
+/* 
+ * Private hook from the HRT driver to the PPM decoder.
+ *
+ * This function is called for every edge of the incoming PPM
+ * signal.
+ *
+ * @param reset		If true, the decoder should be reset (e.g.)
+ *			capture failure was detected.
+ * @param count		The counter value at which the edge
+ *			was captured.
+ */
+
+void	ppm_input_decode(bool reset, uint16_t count);
+
+/*
+ * PPM input initialisation function.
+ *
+ * If message queues are enabled, and mq_name is not NULL, received input
+ * is posted to the message queue as an array of 16-bit unsigned channel values.
+ */
+int	ppm_input_init(const char *mq_name);
+\ No newline at end of file