Added driver for the hdc1008 temperature/humidity sensor.

drivers/sensors/Kconfig

@@ -852,4 +852,33 @@ config SENSORS_ADT7320
 	---help---
 		Enables support for the ADT7320 Driver
 
+config SENSORS_HDC1008
+	bool "TI HDC1008 temperature and humidity sensor"
+	default n
+	select I2C
+	---help---
+		Enable driver support for the TI HDC1008 temperature and humidity sensor.
+
+if SENSORS_HDC1008
+
+config HDC1008_I2C_ADDRESS
+  hex "HDC1008 I2C address"
+  default 0x40
+  range 0x40 0x43
+  ---help---
+    The I2C address of the HDC1008 sensor. It can be configured via straps to
+    a value between 0x40 and 0x43.
+
+config HDC1008_I2C_FREQUENCY
+	int "HDC1008 I2C frequency"
+	default 400000
+	range 1 400000
+
+config HDC1008_DEBUG
+	bool "Debug support for the HDC1008"
+	default n
+	---help---
+		Enables debug features for the HDC1008
+
+endif # SENSORS_HDC1008
 endif # SENSORS

drivers/sensors/Make.defs

@@ -291,6 +291,12 @@ ifeq ($(CONFIG_SENSORS_ZEROCROSS),y)
   CSRCS += zerocross.c
 endif
 
+# TI HDC100X
+
+ifeq ($(CONFIG_SENSORS_HDC1008),y)
+  CSRCS += hdc1008.c
+endif
+
 # Include sensor driver build support
 
 DEPPATH += --dep-path sensors

include/nuttx/sensors/hdc1008.h

@@ -0,0 +1,109 @@
+/****************************************************************************
+ * include/nuttx/sensors/hdc1008.h
+ *
+ *   Copyright (C) 2020 Pelle Windestam. 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 NuttX 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.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTT_SENSORS_HDC1008_H
+#define __INCLUDE_NUTT_SENSORS_HDC1008_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/sensors/ioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Default address if both address pins are grounded */
+
+#define CONFIG_HDC1008_ADDR 0x40
+
+/* Modes of operation. Used in the calls to ioctl(). */
+
+#define HDC1008_MEAS_TEMPERATURE  0x00
+#define HDC1008_MEAS_HUMIDITY     0x01
+#define HDC1008_MEAS_T_AND_RH     0x02
+
+/* IOCTL commands */
+
+#define SNIOC_RESET                 _SNIOC(0x0001) /* Soft Reset */
+#define SNIOC_SET_OPERATIONAL_MODE  _SNIOC(0x0002) /* Mode: 0, 1, 2 */
+#define SNIOC_SET_RESOLUTION_T      _SNIOC(0x0003) /* Resolution: 11, 14 */
+#define SNIOC_SET_RESOLUTION_RH     _SNIOC(0x0004) /* Resolution: 8, 11, 14 */
+#define SNIOC_SET_HEATER_MODE       _SNIOC(0x0005) /* Heater on or off */
+#define SNIOC_GET_CONFIGURATION     _SNIOC(0x0006) /* Read config register */
+#define SNIOC_MEASURE               _SNIOC(0x0007) /* Perform measurement */
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct i2c_master_s;  /* Forward reference */
+
+/* Structure with measurement data. Temperature is scaled by 100 and humidity
+ * by 10.
+ */
+
+struct hdc1008_conv_data_s
+{
+  int temperature;
+  int humidity;
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: hdc1008_register
+ *
+ * Description:
+ *   Register the HDC1008 character device as 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/temp0"
+ *   i2c     - An instance of the I2C interface to use to communicate with
+ *             the HDC1008
+ *   addr    - The I2C address of the HDC1008. The I2C address is
+ *             configurable by two address pins, in the range of 0x40-0x43
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int hdc1008_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+                     uint8_t addr);
+
+#endif /* __INCLUDE_NUTT_SENSORS_HDC1008_H */