drivers/ad7746: Add SAUL integration

drivers/ad7746/ad7746_saul.c

+/*
+ * Copyright (C) 2019 HAW Hamburg
+ *
+ * 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_ad7746
+ * @{
+ *
+ * @file
+ * @brief       AD7746 adaption to the RIOT actuator/sensor interface
+ *
+ * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
+ *
+ * @}
+ */
+
+#include <string.h>
+#include <stdio.h>
+
+#include "saul.h"
+#include "ad7746.h"
+
+static int _read_cap(const void *dev, phydat_t *res)
+{
+    int val;
+    if (ad7746_read_capacitance_1((ad7746_t *)dev, &val)) {
+        return -ECANCELED;
+    }
+
+    res->val[0] = val;
+    res->unit = UNIT_F;
+    res->scale = -15;
+
+    return 1;
+}
+
+static int _read_temp(const void *dev, phydat_t *res)
+{
+    int val;
+    int result;
+    do {
+        result = ad7746_read_temperature_int((ad7746_t *)dev, &val);
+    } while (result == AD7746_NODATA);
+
+    if (result == AD7746_OK) {
+        res->val[0] = val;
+        res->unit = UNIT_TEMP_C;
+        res->scale = 0;
+        return 1;
+    }
+    else {
+        return -ECANCELED;
+    }
+}
+
+static int _read_volt(const void *dev, phydat_t *res)
+{
+    int val;
+    int result;
+    do {
+        result = ad7746_read_voltage_in((ad7746_t *)dev, &val);
+    } while (result == AD7746_NODATA);
+
+    if (result == AD7746_OK) {
+        res->val[0] = val;
+        res->unit = UNIT_V;
+        res->scale = -3;
+        return 1;
+    }
+    else {
+        return -ECANCELED;
+    }
+}
+
+const saul_driver_t ad7746_saul_driver_cap = {
+    .read = _read_cap,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_CAPACITANCE,
+};
+
+const saul_driver_t ad7746_saul_driver_temp = {
+    .read = _read_temp,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_TEMP
+};
+
+const saul_driver_t ad7746_saul_driver_volt = {
+    .read = _read_volt,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_VOLTAGE
+};

sys/auto_init/auto_init.c

@@ -321,6 +321,10 @@ void auto_init(void)
     extern void auto_init_gpio(void);
     auto_init_gpio();
 #endif
+#ifdef MODULE_AD7746
+    extern void auto_init_ad7746(void);
+    auto_init_ad7746();
+#endif
 #ifdef MODULE_ADCXX1C
     extern void auto_init_adcxx1c(void);
     auto_init_adcxx1c();

sys/auto_init/saul/auto_init_ad7746.c

+/*
+ * Copyright (C) 2019 HAW Hamburg
+ *
+ * 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     sys_auto_init_saul
+ * @{
+ *
+ * @file
+ * @brief       Auto initialization of AD7746
+ *
+ * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
+ *
+ * @}
+ */
+
+#ifdef MODULE_AD7746
+
+#include "assert.h"
+#include "log.h"
+
+#include "saul_reg.h"
+#include "ad7746.h"
+#include "ad7746_params.h"
+
+/**
+ * @brief   Define the number of configured sensors
+ */
+#define AD7746_NUM   (sizeof(ad7746_params) / sizeof(ad7746_params[0]))
+
+/**
+ * @brief   Allocate memory for the device descriptors.
+ */
+static ad7746_t ad7746_devs[AD7746_NUM];
+
+/**
+ * @brief   Memory for the SAUL registry entries. Each device provides
+ *          3 SAUL entries (capacitance, temperature and voltage)
+ */
+static saul_reg_t saul_entries[AD7746_NUM * 3];
+
+/**
+ * @brief   Define the number of saul info
+ */
+#define AD7746_INFO_NUM (sizeof(ad7746_saul_info) / sizeof(ad7746_saul_info[0]))
+
+/**
+ * @brief   Reference the driver structs
+ * @{
+ */
+extern saul_driver_t ad7746_saul_driver_cap;
+extern saul_driver_t ad7746_saul_driver_temp;
+extern saul_driver_t ad7746_saul_driver_volt;
+/** @} */
+
+void auto_init_ad7746(void)
+{
+    assert(AD7746_INFO_NUM == AD7746_NUM);
+
+    for (unsigned i = 0; i < AD7746_NUM; i++) {
+        LOG_DEBUG("[auto_init_saul] initializing ad7746 #%d\n", i);
+        if (ad7746_init(&ad7746_devs[i], &ad7746_params[i]) < 0) {
+            LOG_ERROR("[auto_init_saul] error initializing ad7746 #%d\n", i);
+            continue;
+        }
+        /* add capacitance driver */
+        saul_entries[i].dev = &(ad7746_devs[i]);
+        saul_entries[i].name = ad7746_saul_info[i].name;
+        saul_entries[i].driver = &ad7746_saul_driver_cap;
+        saul_reg_add(&(saul_entries[i]));
+
+        /* add temperature driver */
+        saul_entries[i + 1].dev = &(ad7746_devs[i]);
+        saul_entries[i + 1].name = ad7746_saul_info[i].name;
+        saul_entries[i + 1].driver = &ad7746_saul_driver_temp;
+        saul_reg_add(&(saul_entries[i + 1]));
+
+        /* add voltage driver */
+        saul_entries[i + 2].dev = &(ad7746_devs[i]);
+        saul_entries[i + 2].name = ad7746_saul_info[i].name;
+        saul_entries[i + 2].driver = &ad7746_saul_driver_volt;
+        saul_reg_add(&(saul_entries[i + 2]));
+    }
+}
+
+#else
+typedef int dont_be_pedantic;
+#endif /* MODULE_AD7746 */