tests/drivers: add max31855 test application

tests/drivers/max31855/Makefile

@@ -0,0 +1,6 @@
+include ../Makefile.drivers_common
+
+USEMODULE += max31855
+USEMODULE += ztimer_sec
+
+include $(RIOTBASE)/Makefile.include

tests/drivers/max31855/Makefile.ci

@@ -0,0 +1,3 @@
+BOARD_INSUFFICIENT_MEMORY := \
+    atmega8 \
+    #

tests/drivers/max31855/main.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2024 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 tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for the max31855 thermocouple-to-digital converter driver
+ *
+ * @author      Leandro Lanzieri <leandro.lanzieri@haw-hamburg.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "max31855.h"
+#include "max31855_params.h"
+#include "ztimer.h"
+
+#define DELAY   (2)
+
+int main(void)
+{
+    max31855_t dev;
+    max31855_data_t data;
+
+    puts("MAX31855 Thermocouple-to-Digital converter test application\n");
+
+    /* initialize first configured sensor */
+    printf("Initializing MAX31855 converter...\t");
+    if (max31855_init(&dev, &max31855_params[0]) == 0) {
+        puts("[OK]\n");
+    }
+    else {
+        puts("[Failed]");
+        return 1;
+    }
+
+    /* periodically convert temperature values */
+    while (1) {
+        ztimer_sleep(ZTIMER_SEC, DELAY);
+        max31855_read(&dev, &data);
+
+        if (data.fault != MAX31855_FAULT_NO_FAULT) {
+            switch (data.fault) {
+                case MAX31855_FAULT_GND_SHORT:
+                    puts("Fault: Short to GND");
+                    break;
+                case MAX31855_FAULT_VCC_SHORT:
+                    puts("Fault: Short to VCC");
+                    break;
+                case MAX31855_FAULT_OPEN_CIRCUIT:
+                    puts("Fault: Open circuit");
+                    break;
+                default:
+                    puts("Fault: Unknown");
+                    break;
+            }
+
+            continue;
+        }
+
+        printf("Thermocouple temperature: %" PRIi32 ".%"PRId32 "°C\n",
+               data.thermocouple_temperature/100, data.thermocouple_temperature%100);
+
+        printf("Internal temperature: %" PRIi32 ".%" PRId32 "°C\n",
+               data.internal_temperature/100, data.internal_temperature%100);
+    }
+
+    return 0;
+}