tests/driver_ds75lx: add test application

tests/driver_ds75lx/Makefile

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+include ../Makefile.tests_common
+
+USEMODULE += ds75lx
+USEMODULE += xtimer
+
+include $(RIOTBASE)/Makefile.include

tests/driver_ds75lx/README.md

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+## About
+This is a test application for the Maxim DS75LX Temperature sensor.
+
+## Usage
+The application will initialize the DS75LX sensor and, every 2 seconds, reads
+and display the temperature measured by the sensor.

tests/driver_ds75lx/main.c

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+/*
+ * Copyright (C) 2019 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 tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for the DS75LX temperature sensor
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "ds75lx.h"
+#include "ds75lx_params.h"
+#include "xtimer.h"
+
+int main(void)
+{
+    ds75lx_t dev;
+    int result;
+
+    puts("DS75LX test application\n");
+
+    printf("+------------Initializing------------+\n");
+    result = ds75lx_init(&dev, &ds75lx_params[0]);
+    if (result != DS75LX_OK) {
+        puts("[Error] Failed to initialize DS75LX sensor");
+        return 1;
+    }
+
+    puts("Initialization successful\n");
+
+    printf("\n+--------Starting Measurements--------+\n");
+    int16_t temperature;
+    while (1) {
+        ds75lx_wakeup(&dev);
+        /* Get temperature in degrees celsius */
+        ds75lx_read_temperature(&dev, &temperature);
+        ds75lx_shutdown(&dev);
+
+        bool negative = (temperature < 0);
+        if (negative) {
+            temperature = -temperature;
+        }
+
+        printf("Temperature [°C]: %c%d.%02d\n",
+               negative ? '-': ' ',
+               (int)(temperature / 100),
+               (int)(temperature % 100));
+
+        xtimer_sleep(2);
+    }
+
+    return 0;
+}