tests/adxl345: add functionnal test

Signed-off-by: dylad <dylan.laduranty@mesotic.com>

tests/driver_adxl345/Makefile

@@ -0,0 +1,7 @@
+APPLICATION = driver_adxl345
+include ../Makefile.tests_common
+
+USEMODULE += xtimer
+USEMODULE += adxl345
+
+include $(RIOTBASE)/Makefile.include

tests/driver_adxl345/README.md

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+# About
+This is a test application for the ADXL345 accelerometer.
+
+# Datasheet
+http://www.analog.com/media/en/technical-documentation/data-sheets/ADXL345.pdf
+
+# Usage
+This test application will initialize the ADXL345 sensor with the following parameters:
+ - I2C device address set to 0x53
+ - full scale parameter set to +/-16 g
+ - 200 Hz output data-rate
+
+See RIOT/drivers/adxl345_params.h for the default configuration.
+
+After initialization, the sensor reads the x-, y-, z-axis values every 100ms
+and prints them to STDOUT.

tests/driver_adxl345/main.c

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+/*
+ * Copyright (C) 2017 Mesotic SAS
+ *
+ * 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       ADXL345 test application
+ *
+ * @author      Dylan Laduranty <dylan.laduranty@mesotic.com>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "adxl345.h"
+#include "adxl345_params.h"
+#include "xtimer.h"
+
+#define SLEEP_DELAY 100 * 1000U
+
+int main(void)
+{
+    adxl345_t dev;
+    adxl345_data_t data;
+
+    puts("ADXL345 test application");
+    printf("Initializing ADXL345 accelerometer at I2C_DEV(%i)... ",
+           adxl345_params->i2c);
+
+    if (adxl345_init(&dev, adxl345_params) == ADXL345_OK) {
+        puts("[OK]\n");
+    }
+    else {
+        puts("[Failed]");
+        return -1;
+    }
+
+   while(1) {
+        adxl345_read(&dev, &data);
+        printf("Acceleration [in mg]: X axis:%d Y axis:%d Z axis:%d\n",
+                data.x, data.y, data.z);
+        xtimer_usleep(SLEEP_DELAY);
+    }
+    return 0;
+}