drivers/veml6070: initial implementation

drivers/Makefile.dep

@@ -184,6 +184,10 @@ ifneq (,$(filter srf08,$(USEMODULE)))
   USEMODULE += xtimer
 endif
 
+ifneq (,$(filter veml6070,$(USEMODULE)))
+  FEATURES_REQUIRED += periph_i2c
+endif
+
 ifneq (,$(filter w5100,$(USEMODULE)))
   USEMODULE += netdev2_eth
   USEMODULE += luid

drivers/Makefile.include

@@ -100,3 +100,6 @@ endif
 ifneq (,$(filter sdcard_spi,$(USEMODULE)))
     USEMODULE_INCLUDES += $(RIOTBASE)/drivers/sdcard_spi/include
 endif
+ifneq (,$(filter veml6070,$(USEMODULE)))
+    USEMODULE_INCLUDES += $(RIOTBASE)/drivers/veml6070/include
+endif

drivers/include/veml6070.h

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2017 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup    drivers_veml6070 VEML6070
+ * @ingroup     drivers_sensors
+ * @brief       Device driver interface for the VEML6070 UV sensor
+ * @{
+ *
+ * @file
+ * @brief       Device driver interface for the VEML6070 UV sensor.
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ */
+
+#ifndef VEML6070_H
+#define VEML6070_H
+
+#include "saul.h"
+#include "periph/i2c.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Integration times
+ */
+typedef enum veml6070_integrationtime {
+  VEML6070_HALF_T = 0,              /**< 1/2 T integration time */
+  VEML6070_1_T,                     /**< 1 T integration time */
+  VEML6070_2_T,                     /**< 2 T integration time */
+  VEML6070_4_T,                     /**< 4 T integration time */
+} veml6070_itime_t;
+
+/**
+ * @brief   Status and error return codes
+ */
+enum {
+    VEML6070_OK = 0,                /**< Everything was fine */
+    VEML6070_ERR_I2C                /**< Error initializing the I2C bus */
+};
+
+/**
+ * @brief Device initialization parameters
+ */
+typedef struct {
+     i2c_t i2c_dev;                 /**< I2C device which is used */
+     veml6070_itime_t itime;        /**< Integration time */
+} veml6070_params_t;
+
+/**
+ * @brief Device descriptor for the VEML6070 sensor
+ */
+typedef struct {
+    veml6070_params_t params;       /**< Device parameters */
+} veml6070_t;
+
+/**
+ * @brief Initialize the given VEML6070 device
+ *
+ * @param[out] dev          Initialized device descriptor of VEML6070 device
+ * @param[in]  params       The parameters for the VEML6070 device (integration time)
+ *
+ * @return                  VEML6070_OK on success
+ * @return                  VEML6070_ERR_I2C if given I2C is not enabled in board config
+ */
+int veml6070_init(veml6070_t *dev, const veml6070_params_t * params);
+
+/**
+ * @brief Read UV indice from the given VEML6070 device
+ *
+ * @param[in] dev           Device descriptor of VEML6070 device to read from
+ *
+ * @return                  UV indice
+ */
+uint16_t veml6070_read_uv(veml6070_t *dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* VEML6070_H */
+/** @} */

drivers/veml6070/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

drivers/veml6070/include/veml6070_params.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2017 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_veml6070
+ *
+ * @{
+ * @file
+ * @brief       Default configuration for VEML6070
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ */
+
+#ifndef VEML6070_PARAMS_H
+#define VEML6070_PARAMS_H
+
+#include "board.h"
+#include "veml6070.h"
+#include "saul_reg.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Set default configuration parameters for the VEML6070
+ * @{
+ */
+#ifndef VEML6070_PARAM_I2C_DEV
+#define VEML6070_PARAM_I2C_DEV          I2C_DEV(0)
+#endif
+#ifndef VEML6070_PARAM_ITIME
+#define VEML6070_PARAM_ITIME            VEML6070_1_T
+#endif
+
+#define VEML6070_PARAMS_DEFAULT        { .i2c_dev = VEML6070_PARAM_I2C_DEV,  \
+                                         .itime   = VEML6070_PARAM_ITIME }
+/**@}*/
+
+/**
+ * @brief   Configure VEML6070
+ */
+static const veml6070_params_t veml6070_params[] =
+{
+#ifdef VEML6070_PARAMS_BOARD
+    VEML6070_PARAMS_BOARD,
+#else
+    VEML6070_PARAMS_DEFAULT,
+#endif
+};
+
+/**
+ * @brief   Configure SAUL registry entries
+ */
+static const saul_reg_info_t veml6070_saul_reg_info[] =
+{
+    {
+        .name = "veml6070-uv"
+    }
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* VEML6070_PARAMS_H */
+/** @} */

drivers/veml6070/veml6070.c

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2017 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_veml6070
+ * @{
+ *
+ * @file
+ * @brief       Device driver implementation for the VEML6070 UV sensor.
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#include <math.h>
+
+#include "log.h"
+#include "veml6070.h"
+#include "veml6070_params.h"
+#include "periph/i2c.h"
+#include "xtimer.h"
+
+#define ENABLE_DEBUG        (0)
+#include "debug.h"
+
+#define VEML6070_ADDRH                (0x39)
+#define VEML6070_ADDRL                (0x38)
+
+/*---------------------------------------------------------------------------*
+ *                          VEML6070 Core API                                *
+ *---------------------------------------------------------------------------*/
+
+int veml6070_init(veml6070_t *dev, const veml6070_params_t * params)
+{
+    dev->params = *params;
+
+    /* Initialize I2C interface */
+    if (i2c_init_master(dev->params.i2c_dev, I2C_SPEED_NORMAL)) {
+        DEBUG("[Error] I2C device not enabled\n");
+        return -VEML6070_ERR_I2C;
+    }
+
+    /* Acquire exclusive access */
+    i2c_acquire(dev->params.i2c_dev);
+
+    i2c_write_byte(dev->params.i2c_dev, VEML6070_ADDRL,
+                   (uint8_t)(dev->params.itime << 2) | 0x02);
+
+    /* Release I2C device */
+    i2c_release(dev->params.i2c_dev);
+
+    return VEML6070_OK;
+}
+
+uint16_t veml6070_read_uv(veml6070_t *dev)
+{
+    /* Acquire exclusive access */
+    i2c_acquire(dev->params.i2c_dev);
+
+    uint8_t buffer[2];
+    i2c_read_byte(dev->params.i2c_dev, VEML6070_ADDRL, &buffer[0]);
+    i2c_read_byte(dev->params.i2c_dev, VEML6070_ADDRH, &buffer[1]);
+
+    uint16_t uv = (uint16_t)(buffer[1] << 8) | buffer[0];
+
+    /* Release I2C device */
+    i2c_release(dev->params.i2c_dev);
+
+    return uv;
+}

drivers/veml6070/veml6070_saul.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2017 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_veml6070
+ * @{
+ *
+ * @file
+ * @brief       SAUL adaption for VEML6070 UV sensor
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#include <string.h>
+
+#include "saul.h"
+#include "veml6070.h"
+#include "xtimer.h"
+
+static int read_uv(void *dev, phydat_t *res)
+{
+    veml6070_t *d = (veml6070_t *)dev;
+
+    res->val[0] = veml6070_read_uv(d);
+    res->unit = UNIT_NONE;
+    res->scale = -1;
+    return 1;
+}
+
+const saul_driver_t veml6070_uv_saul_driver = {
+    .read = read_uv,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_ANY
+};