Add test case for the jc42 temperature sensor

tests/driver_jc42/Makefile

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+APPLICATION = driver_jc42
+include ../Makefile.tests_common
+
+USEMODULE += jc42
+USEMODULE += xtimer
+
+# set default device parameters in case they are undefined
+TEST_I2C ?= 0
+TEST_I2C_ADDR ?= 0x18
+TEST_I2C_SPEED ?= I2C_SPEED_NORMAL
+
+# export parameters
+CFLAGS += -DTEST_I2C=$(TEST_I2C)
+CFLAGS += -DTEST_I2C_ADDR=$(TEST_I2C_ADDR)
+CFLAGS += -DTEST_I2C_SPEED=$(TEST_I2C_SPEED)
+
+include $(RIOTBASE)/Makefile.include

tests/driver_jc42/README.md

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+# JC42 Driver Test
+
+## Introduction
+This test will test if the jc42 compatible temperature sensor is working.
+
+## Configuration
+There are three parameters to configure:
+
+* `TEST_I2C` — I2C device to use.
+* `TEST_I2C_ADDR` — The sensor address (usually 0x18).
+* `TEST_I2C_SPEED` — The sensor address (usually I2C_SPEED_NORMAL).
+
+## Expected result
+The sensor should continuously (every 1 sec) output the temperature. The precision should be two digits.

tests/driver_jc42/main.c

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+/*
+ * Copyright (C) 2017 Koen Zandberg <koen@bergzand.net>
+ *
+ * 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 jc42 sensor driver
+ *
+ * @author      Koen Zandberg <koen@bergzand.net>
+ *
+ * @}
+ */
+
+#ifndef TEST_I2C
+#error "TEST_I2C not defined"
+#endif
+
+#ifndef TEST_I2C_ADDR
+#error "TEST_I2C_ADDR not defined"
+#endif
+
+#ifndef TEST_I2C_SPEED
+#error "TEST_I2C_SPEED not defined"
+#endif
+
+#include <stdio.h>
+
+#include "xtimer.h"
+
+#include "periph/i2c.h"
+
+#include "jc42.h"
+
+int main(void)
+{
+    jc42_t dev;
+    jc42_params_t params = {
+        .i2c = TEST_I2C,
+        .addr = TEST_I2C_ADDR,
+        .speed = TEST_I2C_SPEED,
+    };
+
+    puts("JC42 temperature sensor test application\n");
+
+    /* initialize the sensor */
+    printf("Initializing sensor...");
+
+    if (jc42_init(&dev, &params) == 0) {
+        puts("[OK]");
+    }
+    else {
+        puts("[Failed]");
+        return 1;
+    }
+
+    /* read temperature every 1 seconds */
+    int16_t temperature;
+    while (1) {
+        printf("Testing sensor communication...");
+        if (jc42_get_temperature(&dev, &temperature) == 0) {
+            puts("[OK]");
+        }
+        else {
+            puts("[Failed]");
+            return 1;
+        }
+        /* display results */
+        printf("temperature: %d.%02d C\n", temperature / 100, temperature % 100);
+
+        /* sleep between measurements */
+        xtimer_usleep(1000 * MS_IN_USEC);
+    }
+
+    return 0;
+}