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diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/tests/utest/semihost_fs/semihost_fs.cpp b/tmk_core/tool/mbed/mbed-sdk/libraries/tests/utest/semihost_fs/semihost_fs.cpp
new file mode 100644
index 000000000..adb49025f
--- /dev/null
+++ b/tmk_core/tool/mbed/mbed-sdk/libraries/tests/utest/semihost_fs/semihost_fs.cpp
@@ -0,0 +1,63 @@
+#include "TestHarness.h"
+#include "mbed.h"
+#include "semihost_api.h"
+#include <stdio.h>
+
+#define FILENAME      "/local/out.txt"
+#define TEST_STRING   "Hello World!"
+
+TEST_GROUP(FirstTestGroup)
+{
+
+    FILE *test_open(const char *mode) {
+        FILE *f = fopen(FILENAME, mode);
+        return f;
+    }
+
+    bool test_write(FILE *f, char *str, int str_len) {
+        int n = fprintf(f, str);
+        return (n == str_len) ? true : false;
+    }
+
+    bool test_read(FILE *f, char *str, int str_len) {
+        int n = fread(str, sizeof(unsigned char), str_len, f);
+        return (n == str_len) ? true : false;
+    }
+
+    bool test_close(FILE *f) {
+        int rc = fclose(f);
+        return rc ? true : false;
+    }
+
+};
+
+TEST(FirstTestGroup, FirstTest)
+{
+    CHECK_TEXT(semihost_connected(), "Semihost not connected")
+
+    LocalFileSystem local("local");
+
+    char *str = TEST_STRING;
+    char *buffer = (char *)malloc(sizeof(unsigned char) * strlen(TEST_STRING));
+    int str_len = strlen(TEST_STRING);
+
+    CHECK_TEXT(buffer != NULL, "Buffer allocation failed");
+    CHECK_TEXT(str_len > 0, "Test string is empty (len <= 0)");
+
+    {
+        // Perform write / read tests
+        FILE *f = NULL;
+        // Write
+        f = test_open("w");
+        CHECK_TEXT(f != NULL, "Error opening file for writing")
+        CHECK_TEXT(test_write(f, str, str_len), "Error writing file");
+        CHECK_TEXT(test_close(f) != EOF, "Error closing file after write");
+
+        // Read
+        f = test_open("r");
+        CHECK_TEXT(f != NULL, "Error opening file for reading")
+        CHECK_TEXT(test_read(f, buffer, str_len), "Error reading file");
+        CHECK_TEXT(test_close(f) != EOF, "Error closing file after read");
+    }
+    CHECK(strncmp(buffer, str, str_len) == 0);
+}