examples: add temperature test

Author: bradjc

examples/tests/temperature/Makefile

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+# Makefile for user application
+
+# Specify this directory relative to the current application.
+TOCK_USERLAND_BASE_DIR = ../../..
+
+# Which files to compile.
+C_SRCS := $(wildcard *.c)
+
+# Include userland master makefile. Contains rules and flags for actually
+# building the application.
+include $(TOCK_USERLAND_BASE_DIR)/AppMakefile.mk

examples/tests/temperature/README.md

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+Simple Temperature Test
+=======================
+
+Uses libtock-sync to read the temperature sensor.

examples/tests/temperature/main.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libtock-sync/sensors/temperature.h>
+
+int main(void) {
+  returncode_t ret;
+
+  if (!libtock_temperature_exists()) {
+    printf("[Temperature] No temperature sensor found.\n");
+    exit(-1);
+  }
+
+  int temp;
+  ret = libtocksync_temperature_read(&temp);
+  if (ret != RETURNCODE_SUCCESS) {
+    printf("[Temperature] Error reading temperature sensor.\n");
+    printf("[Temperature] %s\n", tock_strrcode(ret));
+    exit(-2);
+  }
+
+  int temp_ones       = temp / 100;
+  int temp_hundredths = temp - (temp_ones * 100);
+  printf("[Temperature] %d.%d deg C\n", temp_ones, temp_hundredths);
+
+  return 0;
+}