tests/cpu_efm32_drivers: add test application

tests/cpu_efm32_drivers/Makefile

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+BOARD ?= sltb001a
+include ../Makefile.tests_common
+
+BOARD_WHITELIST := ikea-tradfri \
+                   slstk3401a \
+                   slstk3402a \
+                   sltb001a \
+                   slwstk6000b-slwrb4150a \
+                   slwstk6000b-slwrb4162a \
+                   slwstk6220a \
+                   stk3200 \
+                   stk3600 \
+                   stk3700
+
+USEMODULE += efm32_coretemp
+
+include $(RIOTBASE)/Makefile.include

tests/cpu_efm32_drivers/README.md

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+# EFM32 CPU Drivers
+
+## Introduction
+The EFM32 CPU has additional drivers that can be used. This test application
+ensure that these drivers work.
+
+Current tests includes:
+* EFM32 core temperature driver
+
+## Expected result
+The test application compiles for EFM32-based boards.

tests/cpu_efm32_drivers/main.c

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+/*
+ * Copyright (C) 2020 Bas Stottelaar <basstottelaar@gmail.com>
+ *
+ * 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 EFM32 specific drivers
+ *
+ * @author      Bas Stottelaar <basstottelaar@gmail.com>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "coretemp.h"
+
+static void test_coretemp(void)
+{
+    puts("Testing internal EFM32 temperature driver.");
+
+    /* initialize the sensor */
+    int result = coretemp_init();
+
+    if (result == 0) {
+        puts("Driver initialization OK.");
+    }
+    else {
+        printf("Driver initialization failed: %d.", result);
+        return;
+    }
+
+    /* read temperature */
+    int16_t temperature = coretemp_read();
+
+    printf("Temperature: %d.%02d C\n", temperature / 100, temperature % 100);
+}
+
+int main(void)
+{
+    test_coretemp();
+
+    return 0;
+}