Added simple blinky unit test to mbed framework

examples/unit-test/mbed-blink/lib/readme.txt

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+
+This directory is intended for the project specific (private) libraries.
+PlatformIO will compile them to static libraries and link to executable file.
+
+The source code of each library should be placed in separate directory, like
+"lib/private_lib/[here are source files]".
+
+For example, see how can be organized `Foo` and `Bar` libraries:
+
+|--lib
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |- readme.txt --> THIS FILE
+|- platformio.ini
+|--src
+   |- main.c
+
+Then in `src/main.c` you should use:
+
+#include <Foo.h>
+#include <Bar.h>
+
+// rest H/C/CPP code
+
+PlatformIO will find your libraries automatically, configure preprocessor's
+include paths and build them.
+
+More information about PlatformIO Library Dependency Finder
+- http://docs.platformio.org/en/stable/librarymanager/ldf.html

examples/unit-test/mbed-blink/platformio.ini

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+# ; PlatformIO Project Configuration File
+# ;
+# ;   Build options: build flags, source filter, extra scripting
+# ;   Upload options: custom port, speed and extra flags
+# ;   Library options: dependencies, extra library storages
+# ;
+# ; Please visit documentation for the other options and examples
+# ; http://docs.platformio.org/en/stable/projectconf.html
+
+[env:bluepill_f103c8]
+platform = ststm32
+board = bluepill_f103c8
+framework = mbed
+upload_protocol = gdb
+test_port = /dev/cu.usbmodemBFDEA5F3

examples/unit-test/mbed-blink/src/main.cpp

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+#include "mbed.h"
+
+#ifndef UNIT_TEST
+DigitalOut myled(PC_13);
+
+int main(void)
+{
+        while (1) {
+                myled = 1;
+                wait(1);
+                myled = 0;
+                wait(1);
+        }
+}
+#endif

examples/unit-test/mbed-blink/test/test_main.cpp

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+#include "mbed.h"
+#include "unity.h"
+
+#ifdef UNIT_TEST
+DigitalOut myled(PC_13);
+
+void test_led_write_high(void)
+{
+        myled.write(1);
+        TEST_ASSERT_EQUAL(myled.read(), 1);
+}
+
+void test_led_write_low(void)
+{
+        myled.write(0);
+        TEST_ASSERT_EQUAL(myled.read(), 0);
+}
+
+int main(void)
+{
+        UNITY_BEGIN();
+
+        wait(1);
+// Without the above delay, the console does not print the PASS/FAIL message
+// for the first couple of unit tests
+        RUN_TEST(test_led_write_high);
+        wait(0.5);
+        RUN_TEST(test_led_write_low);
+        wait(0.5);
+        UNITY_END();
+}
+
+
+#endif

examples/unit-test/mbed-blink/upload.gdb

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+target extended-remote /dev/cu.usbmodemBFDEA5F1
+monitor swdp_scan
+attach 1
+load
+quit
+yes