lps22hb barometer driver

src/drivers/barometer/lps22hb/LPS22HB_SPI.cpp

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+/****************************************************************************
+ *
+ *   Copyright (c) 2018 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 LPS22HB_SPI.cpp
+ *
+ * SPI interface for LPS22HB
+ */
+
+#include "LPS22HB.hpp"
+
+#include <cstring>
+
+#include <px4_config.h>
+
+#include <drivers/device/spi.h>
+#include <drivers/drv_device.h>
+
+#ifdef PX4_SPIDEV_LPS22HB
+
+/* SPI protocol address bits */
+#define DIR_READ			(1<<7)
+#define DIR_WRITE			(0<<7)
+
+device::Device *LPS22HB_SPI_interface(int bus);
+
+class LPS22HB_SPI : public device::SPI
+{
+public:
+	LPS22HB_SPI(int bus, uint32_t device);
+	virtual ~LPS22HB_SPI() = default;
+
+	virtual int	init();
+	virtual int	read(unsigned address, void *data, unsigned count);
+	virtual int	write(unsigned address, void *data, unsigned count);
+
+};
+
+device::Device *
+LPS22HB_SPI_interface(int bus)
+{
+	return new LPS22HB_SPI(bus, PX4_SPIDEV_LPS22HB);
+}
+
+LPS22HB_SPI::LPS22HB_SPI(int bus, uint32_t device) : SPI("LPS22HB_SPI", nullptr, bus, device, SPIDEV_MODE3, 10000000)
+{
+	_device_id.devid_s.devtype = DRV_BARO_DEVTYPE_LPS22HB;
+}
+
+int
+LPS22HB_SPI::init()
+{
+	int ret = SPI::init();
+
+	if (ret != OK) {
+		DEVICE_DEBUG("SPI init failed");
+		return -EIO;
+	}
+
+	// read WHO_AM_I value
+	uint8_t id = 0;
+
+	if (read(WHO_AM_I, &id, 1)) {
+		DEVICE_DEBUG("read_reg fail");
+		return -EIO;
+	}
+
+	if (id != LPS22HB_ID_WHO_AM_I) {
+		DEVICE_DEBUG("ID byte mismatch (%02x != %02x)", LPS22HB_ID_WHO_AM_I, id);
+		return -EIO;
+	}
+
+	return OK;
+}
+
+int
+LPS22HB_SPI::write(unsigned address, void *data, unsigned count)
+{
+	uint8_t buf[32];
+
+	if (sizeof(buf) < (count + 1)) {
+		return -EIO;
+	}
+
+	buf[0] = address | DIR_WRITE;
+	memcpy(&buf[1], data, count);
+
+	return transfer(&buf[0], &buf[0], count + 1);
+}
+
+int
+LPS22HB_SPI::read(unsigned address, void *data, unsigned count)
+{
+	uint8_t buf[32];
+
+	if (sizeof(buf) < (count + 1)) {
+		return -EIO;
+	}
+
+	buf[0] = address | DIR_READ;
+
+	int ret = transfer(&buf[0], &buf[0], count + 1);
+	memcpy(data, &buf[1], count);
+	return ret;
+}
+
+#endif /* PX4_SPIDEV_LPS22HB */