Vergil Cola
Fork of my MQTTGateway
Diff: sd-driver/README.md
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+# mbed OS SDCard Driver (sd-driver) for FAT32 Filesystem Support
+
+
+Simon Hughes
+
+20170329
+
+Version 1.00
+
+
+# Executive Summary
+
+The purpose of this document is to describe how to use the mbed OS SDCard
+driver (sd-driver) so applications can read/write
+data to flash storage cards using the standard POSIX File API
+programming interface. The sd-driver uses the SDCard SPI-mode of operation
+which is a subset of possible SDCard functionality.
+
+This repository contains the mbed-os SDCard driver for generic SPI
+SDCard support and other resources, as outlined below:
+
+- `SDBlockDevice.h` and `SDBlockDevice.cpp`. This is the SDCard driver module presenting
+ a Block Device API (derived from BlockDevice) to the underlying SDCard.
+- POSIX File API test cases for testing the FAT32 filesystem on SDCard.
+ - basic.cpp, a basic set of functional test cases.
+ - fopen.cpp, more functional tests reading/writing greater volumes of data to SDCard, for example.
+- `mbed_app.json` mbed-os application configuration file with SPI pin configurations for the CI shield and overrides for specific targets.
+ This file allows the SPI pins to be specified for the target without having to edit the implementation files.
+- This README which includes [Summary of POSIX File API Documentation](#summary-posix-api-documentation)
+ including detailed instruction on how to use the FAT filesystem and SDBlockDevice driver.
+
+The SDCard driver is maintained in this repository as a component separate from the main mbed OS repository.
+Hence the 2 repositories (mbed-os and sd-driver) have to be used together
+to deliver the FAT32 Filesystem/SDCard support. This document explains how to do this.
+
+
+# Introduction
+
+### Overview
+
+The scope of this document is to describe how applications use the FAT filesystem and sd-driver
+components to persistently store data on SDCards. The document is intended to help developers adopt the
+mbed OS POSIX File API support, and in particular to help explain:
+
+- How the software components work together to deliver the storage functionality.
+- How to work with the sd-driver and mbed OS to build the examples. The example code can easily
+ be copied into your new application code.
+- How to work with the CI Test Shield, which adds an SDCard slot to those targets that do not have already have one.
+- How to run the POSIX File API mbed Greentea test cases, which provide further example code of how to use
+ the POSIX File API.
+
+Section 1 provides an Executive Summary, describing the purpose of the sd-driver, the supporting
+software, examples, test cases and documentation.
+
+Section 2 provides an an overview of the material covered including descriptions of the major sections.
+
+Section 3 provides an overview of the mbed OS filesystem software components,
+including the inter-relationships between the application, POSIX file API, the standard c-library,
+the mbed OS filesystem and the SDCard driver (sd-driver).
+
+Section 4 describes how to build and run an example application for reading
+and writing data to an SDCard using the POSIX File API. The example begins by describing
+the procedure for building and testing on the K64F target. The final sub-sections
+describe how to use the test shield to add an SDCard slot to any mbed target,
+and hence enable the persistent storage of data on any supported target.
+
+Section 5 describes an example application which uses the raw
+BlockDevice API to read and write data to the SDCard.
+
+Section 6 describes how to build and run the SDCard POSIX File API mbed Greentea test cases.
+There are a number of functional test cases demonstrating how to use the
+mbed OS POSIX File API.
+
+Section 7 describes the POSIX File API and provides links to useful API documentation web pages.
+
+
+### Known mbed-os and sd-driver Compatible Versions
+
+The following versions of the mbed-os and sd-driver repositories are known to work together:
+
+- {mbed-os, sd-driver} = {mbed-os-5.4.0-rc2, sd-driver-0.0.1-mbed-os-5.4.0-rc2}.
+ `K64F`, `NUCLEO_F429ZI` and `UBLOX_EVK_ODIN_W2` fopen and basic filesystem tests working.
+- {mbed-os, sd-driver} = {mbed-os-5.4.0, sd-driver-0.0.2-mbed-os-5.4.0}.
+ `K64F`, `NUCLEO_F429ZI` and `UBLOX_EVK_ODIN_W2` fopen and basic filesystem tests working.
+- {mbed-os, sd-driver} = {mbed-os-5.4.1, sd-driver-0.0.3-mbed-os-5.4.1}.
+
+To find the latest compatible versions, use the following command to see the messages attached to the tags
+in the sd-driver repository:
+
+ ex_app7/$ cd sd-driver
+ ex_app7/sd-driver$ git tag -n
+ sd-driver-0.0.1-mbed-os-5.3.4 Version compatible with mbed-os-5.3.4, and private_mbedos_filesystems-0.0.1-mbed-os-5.3.4.
+ sd-driver-0.0.2-mbed-os-5.4.0 Updated README.md to include worked exmaples and restructuring of information.
+ sd-driver-0.0.3-mbed-os-5.4.1 Version compatible with mbed-os-5.4.1.
+
+
+### Known Issues With This Document
+
+There are no known issues with this document.
+
+
+# Overview of mbed OS Filesystem Software Component Stack
+
+
+ ------------------------
+ | |
+ | Application | // This application uses the POSIX File API
+ | | // to read/write data to persistent storage backends.
+ ------------------------
+
+ ------------------------ // POSIX File API (ISO).
+
+ ------------------------
+ | |
+ | libc | // The standard c library implementation
+ | | // e.g. newlib.
+ ------------------------
+
+ ------------------------ // sys_xxx equivalent API.
+
+ ------------------------
+ | |
+ | mbed_retarget.cpp | // Target specific mapping layer.
+ | |
+ ------------------------
+
+ ------------------------ // Filesystem Upper Edge API.
+
+ ------------------------
+ | |
+ | File System | // File system wrappers and implementation.
+ | |
+ ------------------------
+
+ ------------------------ // FS Lower Edge API (Block Store Interface).
+
+ ------------------------
+ | Block API |
+ | Device Driver | // The SDCard driver, for example.
+ | e.g. sd-driver |
+ ------------------------
+
+ ------------------------ // SPI.h interface.
+
+ ------------------------
+ | |
+ | SPI | // SPI subsystem (C++ classes and C-HAL implementation).
+ | |
+ ------------------------
+
+ Figure 1. mbedOS generic architecture of filesystem software stack.
+
+The figure above shows the mbed OS software component stack used for data
+storage on SDCard:
+
+- At the top level is the application component which uses the standard POSIX File API
+ to read and write application data to persistent storage.
+- The newlib standard library (libc) stdio.h interface (POSIX File API)
+ implementation is used as it's optimised for resource limited embedded systems.
+- mbed_retarget.cpp implements the libc back-end file OS handlers and maps them
+ to the FileSystem.
+- The File System code (hosted in mbed-os) is composed of 2 parts:
+ - The mbed OS file system wrapper classes (e.g. FileSystem, File, FileBase classes)
+ which are used to present a consistent API to the retarget module for different
+ (third-party) file system implementations.
+ - The FAT filesystem implementation code.
+ The [FATFS: Generic FAT File System Module](http://elm-chan.org/fsw/ff/00index_e.html)
+ (ChanFS) has been integrated within mbed-os.
+- The Block API Device Driver. The SDCard driver is an example of a persistent storage driver.
+ It's maintained as a separate component from the mbed OS repository (in this repository).
+- The SPI module provides the mbed OS generic SPI API. This functionality is maintained in
+ mbed OS.
+
+
+# SDCard POSIX File API Example App for Reading/Writing Data
+
+### Overview
+
+This section describes how to build and run an example application that
+uses the POSIX File API to read and write data to SDCard. The discussion begins by
+descibing how to run the example on the FRDM K64F target, but this is later
+generalised to all target platforms that have the standard
+Arduino form factor headers. Tthe Continuous Integration (CI) Test Shield
+can be inserted into the headers to add a SDCard slot to the target.
+
+The example code is a modified version of the
+[mbed-os-example-fat-filesystem](https://github.com/ARMmbed/mbed-os-example-fat-filesystem) example
+modified for use with the sd-driver.
+
+The following sub-sections describe the steps for building and running the example:
+
+- The [Pre-Requisites](#pre-requisites) section describes the development environment used for this example.
+ Other similar development environments can be used.
+- The [Create the Example Project](#create-the-example-project) section describes how the application project is created
+ by including the mbed-os and sd-driver code.
+- The [Build the Example Project](#build-the-example-project) section describes how to build the example application.
+- The [Insert SDCard into K64F](#insert-sdcard-into-k64f) section describes how to select a card and insert it into the
+ SDCard slot on the K64F.
+- The [Run the Example Binary on the K64F](#run-the-example-binary-on-the-k64f) section describes how to run the
+ example binary on the target and verify the example has run correctly.
+- The [Testing with an SDCard on Target XYZ](#testing-with-an-sdcard-on-target-xyx) section describes the use
+ of Continuous Integration Test Shield, which hosts an SDCard slot. By inserting the CI test shield into the
+ Arduino headers of an mbed target platform, the SDCard/FAT Filesystem components can be used to store data
+ persistently on any standard mbed target development board.
+
+
+### <a name="pre-requisites"></a> Pre-Requisites
+
+To work through this example, you should have a working development environment on your machine. For example,
+the following tools should be installed:
+
+- A compiler e.g. arm-none-eabi-gcc.
+- Python 2.7.9 or later.
+- [mbed Greentea](https://github.com/armmbed/greentea), the mbed OS test tool.
+- Git Bash or a similar git command line tool to interact with the ARM mbed GitHub repositories.
+- [mbed-cli](https://github.com/armmbed/mbed-cli), the tool used to make mbed OS application and test builds.
+
+For more information on how to setup a development environment, please review the documentation on the
+[mbed documentation site](https://docs.mbed.com).
+
+
+### <a name="create-the-example-project"></a> Create the Example Project
+
+First create the top level application directory sd_ex1 and move into it:
+
+ simhug01@E107851:/d/demo_area$ mkdir sd_ex1
+ simhug01@E107851:/d/demo_area$ cd sd_ex1
+ simhug01@E107851:/d/demo_area/sd_ex1$
+
+Next, perform the "mbed new" operation to download the mbed-os repository into this directory:
+
+ simhug01@E107851:/d/demo_area/sd_ex1$ mbed new .
+ [mbed] Creating new program "ex_sdcard" (git)
+ [mbed] Adding library "mbed-os" from "https://github.com/ARMmbed/mbed-os" at branch latest
+ [mbed] Updating reference "mbed-os" -> "https://github.com/ARMmbed/mbed-os/#5faf4b26c5954d15c7c1cccac6498e0c690ad101"
+ warning: LF will be replaced by CRLF in mbed-os.lib.
+ The file will have its original line endings in your working directory.
+ (mx1_venv1) simhug01@E107851:/d/demo_area/sd_ex1$ ls -1
+ mbed-os
+ mbed-os.lib
+ mbed_settings.py
+ (mx1_venv1) simhug01@E107851:/d/demo_area/sd_ex1$
+
+Next, get add the sd-driver component to the application project:
+
+ simhug01@E107851:/d/demo_area/sd_ex1$ mbed add sd-driver
+ <trace removed>
+ simhug01@E107851:/d/demo_area/sd_ex1$
+
+Next, copy the example1.cpp file and `mbed_app.json` files from inside the sd-driver directory to the top level sd_ex1 directory:
+
+ simhug01@E107851:/d/demo_area/sd_ex1$ cp sd-driver/features/TESTS/examples/example1.cpp .
+ simhug01@E107851:/d/demo_area/sd_ex1$ cp sd-driver/config/mbed_app.json .
+ simhug01@E107851:/d/demo_area/sd_ex1$
+
+The `mbed_app.json` file specifies the SPI bus pin configuration for different targets.
+The file includes a specific configuration of the K64F which is used
+because the mbed compile command specifies the K64F build target. The `mbed_app.json` file
+is described in more detail in the [Testing with an SDCard on Target XYZ](#testing-with-an-sdcard-on-target-xyx) section.
+
+### <a name="build-the-example-project"></a> Build the Example Project
+
+Next, build the example application:
+
+ simhug01@E107851:/d/demo_area/sd_ex1$ mbed compile -m K64F -t GCC_ARM
+
+
+#### WARNING: "mbed new ." command and possible mbed-os sd-driver versioning incompatibilities
+
+If you experience problems building the example then it may mean the version
+of the mbed-os repository created with the "mbed new ." command is not compatible with
+the sd-driver repository version created with "mbed add sd-driver" command. This is because:
+
+- The "mbed new ." creates the mbed-os repository at the latest "Release" e.g. `mbed-os-5.4.0`.
+- The "mbed add sd-driver" command creates the sd-driver repository at the latest version of
+ master i.e. the tip of master. Changes may be present that are not compatible with
+ the latest mbed-os release e.g. in preparation for the next release.
+
+This situation can be resolved by checking out compatible versions of the repositories as
+described in the section [Setting mbed-os/sd-driver Repositories To Compatible Versions](#settting-repos-to-compatible-versions)
+
+### <a name="insert-sdcard-into-k64f"></a> Insert SDCard into K64F
+
+The examples and test cases have been run on a K64F with the following pre-formatted microSDHC cards:
+
+- Kingston 2GB mircoSDHC card.
+- Kingston 8GB mircoSDHC card.
+- SanDisk 16GB mircoSDHC ultra card.
+
+If the card requires formatting then the following procedure is known to work:
+
+- Insert microSD card into SD adapter in USB stick (or similar) so the microSD card can be insert into windows PC.
+- Within file explorer, right click/Format on the USB drive.
+- Select FAT32, 4096 cluster size, Quick Format.
+- Format the drive.
+
+The microSD card should then be ready for use in the K64F. Insert the formatted card
+into the SDCard slot on the K64F PCB.
+
+
+### <a name="run-the-example-binary-on-the-k64f"></a> Run the Example Binary on the K64F
+
+Once the binary is built, copy the binary from `/d/demo_area/sd_ex1/BUILD/K64F/GCC_ARM/example1.bin` to the K64F.
+After connecting a serial console and resetting the target, the following trace should be seen:
+
+ Welcome to the filesystem example.
+ Opening a new file, numbers.txt. done.
+ Writing decimal numbers to a file (20/20) done.
+ Closing file. done.
+ Re-opening file read-only. done.
+ Dumping file to screen.
+ 0
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ 9
+ 10
+ 11
+ 12
+ 13
+ 14
+ 15
+ 16
+ 17
+ 18
+ 19
+ EOF.
+ Closing file. done.
+ Opening root directory. done.
+ Printing all filenames:
+ numbers.txt
+ Closeing root directory. done.
+ Filesystem Demo complete.
+
+
+### <a name="testing-with-an-sdcard-on-target-xyx"></a> Testing with an SDCard on Target XYZ
+
+The standard way to test is with the mbed CI Test Shield plugged into the
+target board. This pin mapping for this configuration is parameterised in
+the `mbed_app.json` file.
+
+The following is an example of the `mbed_app.json` file available in the repository:
+
+ {
+ "config": {
+ "UART_RX": "D0",
+ "UART_TX": "D1",
+ "DIO_0": "D0",
+ "DIO_1": "D1",
+ "DIO_2": "D2",
+ "DIO_3": "D3",
+ "DIO_4": "D4",
+ "DIO_5": "D5",
+ "DIO_6": "D6",
+ "DIO_7": "D7",
+ "DIO_8": "D8",
+ "DIO_9": "D9",
+ "SPI_CS": "D10",
+ "SPI_MOSI": "D11",
+ "SPI_MISO": "D12",
+ "SPI_CLK": "D13",
+ "I2C_SDA": "D14",
+ "I2C_SCL": "D15",
+ "I2C_TEMP_ADDR":"0x90",
+ "I2C_EEPROM_ADDR":"0xA0",
+ "AIN_0": "A0",
+ "AIN_1": "A1",
+ "AIN_2": "A2",
+ "AIN_3": "A3",
+ "AIN_4": "A4",
+ "AIN_5": "A5",
+ "AOUT" : "A5",
+ "PWM_0": "D3",
+ "PWM_1": "D5",
+ "PWM_2": "D6",
+ "PWM_3": "D9",
+ "DEBUG_MSG": 0,
+ "DEVICE_SPI": 1,
+ "FSFAT_SDCARD_INSTALLED": 1
+ },
+ "target_overrides": {
+ "DISCO_F051R8": {
+ "SPI_MOSI": "SPI_MOSI",
+ "SPI_MISO": "SPI_MISO",
+ "SPI_CLK": "SPI_SCK",
+ "SPI_CS": "SPI_CS"
+ },
+ "K20D50M": {
+ "SPI_MOSI": "PTD2",
+ "SPI_MISO": "PTD3",
+ "SPI_CLK": "PTD1",
+ "SPI_CS": "PTC2"
+ },
+ "KL22F": {
+ "SPI_MOSI": "PTD6",
+ "SPI_MISO": "PTD7",
+ "SPI_CLK": "PTD5",
+ "SPI_CS": "PTD4"
+ },
+ "KL25Z": {
+ "SPI_MOSI": "PTD2",
+ "SPI_MISO": "PTD3",
+ "SPI_CLK": "PTD1",
+ "SPI_CS": "PTD0"
+ },
+ "KL43Z": {
+ "SPI_MOSI": "PTD6",
+ "SPI_MISO": "PTD7",
+ "SPI_CLK": "PTD5",
+ "SPI_CS": "PTD4"
+ },
+ "KL46Z": {
+ "SPI_MOSI": "PTD6",
+ "SPI_MISO": "PTD7",
+ "SPI_CLK": "PTD5",
+ "SPI_CS": "PTD4"
+ },
+ "K64F": {
+ "SPI_MOSI": "PTE3",
+ "SPI_MISO": "PTE1",
+ "SPI_CLK": "PTE2",
+ "SPI_CS": "PTE4"
+ },
+ "K66F": {
+ "SPI_MOSI": "PTE3",
+ "SPI_MISO": "PTE1",
+ "SPI_CLK": "PTE2",
+ "SPI_CS": "PTE4"
+ },
+ "LPC11U37H_401": {
+ "SPI_MOSI": "SDMOSI",
+ "SPI_MISO": "SDMISO",
+ "SPI_CLK": "SDSCLK",
+ "SPI_CS": "SDSSEL"
+ },
+ "LPC2368": {
+ "SPI_MOSI": "p11",
+ "SPI_MISO": "p12",
+ "SPI_CLK": "p13",
+ "SPI_CS": "p14"
+ },
+ "NUCLEO_L031K6": {
+ "SPI_MOSI": "SPI_MOSI",
+ "SPI_MISO": "SPI_MISO",
+ "SPI_CLK": "SPI_SCK",
+ "SPI_CS": "SPI_CS"
+ },
+ "nRF51822": {
+ "SPI_MOSI": "p12",
+ "SPI_MISO": "p13",
+ "SPI_CLK": "p15",
+ "SPI_CS": "p14"
+ },
+ "RZ_A1H": {
+ "SPI_MOSI": "P8_5",
+ "SPI_MISO": "P8_6",
+ "SPI_CLK": "P8_3",
+ "SPI_CS": "P8_4"
+ }
+ }
+ }
+
+Note the following things about the `mbed_app.json` file:
+
+- The `mbed_app.json` file is used to define target specific symbols for the SPI pins connecting the SDCard slot to the target MCU:
+ - "SPI\_CS". This is the Chip Select line.
+ - "SPI\_MOSI". This is the Master Out Slave In data line.
+ - "SPI\_MISO". This is the Master In Slave Out data line.
+ - "SPI\_CLK". This is the serial Clock line.
+- The default configuration defined in the "config" section is for the standard Arduino header pin mappings for the SPI bus.
+ The "config" section defines a dictionary mapping functional names to target board Arduino header pins:
+ - "SPI\_CS": "D10". This causes the MBED\_CONF\_APP\_SPI\_CS symbol to be defined in mbed\_config.h as D10, which is used in the filesystem test implementation.
+ D10 is defined in the target specific PinNames.h file.
+ - "SPI\_MOSI": "D11". This causes the MBED\_CONF\_APP\_SPI\_MOSI symbol to be defined in mbed\_config.h.
+ - "SPI\_MISO": "D12". This causes the MBED\_CONF\_APP\_SPI\_MISO symbol to be defined in mbed\_config.h.
+ - "SPI\_CLK": "D13". This causes the MBED\_CONF\_APP\_SPI\_CLK symbol to be defined in mbed\_config.h.
+- The `"target_overrides"` section is used to override the "SPI\_xxx" symbols for specific target boards, which may have an SDCard slot, for example.
+ This is the case for the K64F, where the "SPI\_xxx" are mapped to the pin names for the on-board SDCard.
+
+ ```
+ "K64F": {
+ "SPI_MOSI": "PTE3",
+ "SPI_MISO": "PTE1",
+ "SPI_CLK": "PTE2",
+ "SPI_CS": "PTE4"
+ }
+ ```
+- Thus, in the absence of any target specific definitions in the `"target_overrides"` section, all boards will default to
+ using the Arduino header configuration. For those platforms with a `"target_overrides"` section then this configuration
+ will be used in preference.
+- Hence in the case that you want to test a platform with an SDCard inserted into a
+ fitted CI test shield (rather than the on-board SDCard slot)
+ and there is a `"target_overrides"` section present in the `mbed_app.json` file, you must then delete the `"target_overrides"`
+ section before building. This will result in the default configuration being used (suitable for the CI
+ Test Shield).
+- Note when inserting the v1.0.0 CI Test Shield into the Arduino header of the target platform, the shield pins D0 and
+ D1 should be bent to be parallel to the shield PCB so they are not inserted into the Arduino header. This is because
+ some boards use the same UART on DAPLINK and D0/D1, which means the serial debug channel breaks and hence the mbed greentea
+ test suite will not work correctly. This is mainly on older ST boards and should not be a problem on
+ `K64F`, `NUCLEO_F429ZI` and `UBLOX_EVK_ODIN_W2`. Note also that the v2.0.0 CI Test Shield doesn't suffer from this
+ problem and the pins don't need to be bent.
+- When inserting the SDCard into the card slot on the CI test shield, make sure the card is fully inserted.
+ On insertion, there should be a small clicking sound when the card registers, and the back edge of the card
+ should protrude no more than ~1mm over the edge of the CI test shield PCB. If the SDCard fails to register,
+ try gently pushing the metal flexible strip in the shape of a spade at the top edge of the SDCard metal slot
+ casing with a pair of tweezers, bending it a little to lower it into the slot casing. This helps with the
+ insertion mechanism.
+
+
+### Target K64F with CI Test Shield fitted
+
+
+
+**Figure 2. The figure shows the K64F platform with the CI shield fitted.**
+
+The above figure shows the K64F with the v1.0.0 CI test shield fitted. Note:
+
+- The pins D0/D1 (top right of CI test shield) are bent sideways so as not to insert into the header.
+- The SDCard is fully inserted into the slot and overhangs the PCB by ~1mm.
+
+
+# SDBlockDevice Example Application
+
+The following sample code illustrates how to use the sd-driver Block Device API:
+
+
+ #include "mbed.h"
+ #include "SDBlockDevice.h"
+
+ // Instantiate the SDBlockDevice by specifying the SPI pins connected to the SDCard
+ // socket. The PINS are:
+ // MOSI (Master Out Slave In)
+ // MISO (Master In Slave Out)
+ // SCLK (Serial Clock)
+ // CS (Chip Select)
+ SDBlockDevice sd(p5, p6, p7, p12); // mosi, miso, sclk, cs
+ uint8_t block[512] = "Hello World!\n";
+
+ int main()
+ {
+ // call the SDBlockDevice instance initialisation method.
+ sd.init();
+
+ // Write some the data block to the device
+ sd.program(block, 0, 512);
+
+ // read the data block from the device
+ sd.read(block, 0, 512);
+
+ // print the contents of the block
+ printf("%s", block);
+
+ // call the SDBlockDevice instance de-initialisation method.
+ sd.deinit();
+ }
+
+
+# SDCard POSIX File API mbed Greentea Test Cases
+
+This section describes how to build and run the POSIX file API test cases.
+The following steps are covered:
+
+- [Create the FAT/SDCard Application Project](#create-fat-sdcard-application-project).
+ This section describes how to git clone the mbed OS and sd-driver repositories containing the
+ code and test cases of interest.
+- [Build the mbed OS Test Cases](#build-the-mbedos-test-cases). This section
+ describes how to build the mbed OS test cases.
+- [Insert a microSD Card Into the K64F for Greentea Testing](#greentea-insert-sdcard-into-k64f).This section
+ describes how to format (if required) a microSD card prior to running the tests.
+- [Run the POSIX File Test Case](#run-the-posix-file-test-cases).This section
+ describes how to run the POSIX file test cases.
+
+
+### <a name="create-fat-sdcard-application-project"></a> Create the FAT/SDCard Application Project
+
+This section describes how to create an application project combining the
+mbed-os and sd-driver repositories into a single project.
+In summary the following steps will be covered in this section:
+
+- A top level application project directory is created. The directory name is ex_app1.
+- In the ex_app1 directory, the mbed-os repository is cloned.
+- In the ex_app1 directory at the same level as the mbed-os directory, the sd-driver repository is cloned.
+- The `mbed_app.json` file is copied from the `sd-driver/config/mbed_app.json` to the ex_app1 directory.
+
+First create the top level application directory ex_app1 and move into it:
+
+ simhug01@E107851:/d/demo_area$ mkdir ex_app1
+ simhug01@E107851:/d/demo_area$ pushd ex_app1
+
+Next, get a clone of public mbed OS repository in the following way:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ git clone git@github.com:/armmbed/mbed-os
+ <trace removed>
+ simhug01@E107851:/d/demo_area/ex_app1$
+
+Next, get a clone of the sd-driver repository:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ git clone git@github.com:/armmbed/sd-driver
+ <trace removed>
+ simhug01@E107851:/d/demo_area/ex_app1$
+
+Finally, copy the `mbed_app.json` application configuration file from `sd-driver/config/mbed_app.json` to the ex_app1 directory:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ cp sd-driver/config/mbed_app.json .
+ simhug01@E107851:/d/demo_area/ex_app1$
+
+The `mbed_app.json` file specifies the SPI bus pin configuration for different targets,
+and is discussed in the [Testing with an SDCard on Target XYZ](#testing-with-an-sdcard-on-target-xyx) section.
+
+
+### <a name="build-the-mbedos-test-cases"></a> Build the mbed OS Test Cases
+
+Build the test cases for the K64F target using the following command:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ mbed -v test --compile -t GCC_ARM -m K64F --app-config mbed_app.json
+ <trace removed>
+ simhug01@E107851:/d/demo_area/ex_app1$
+
+The build trace is quite extensive but on a successful build you should see the following output at the end of the log:
+
+ Build successes:
+ * K64F::GCC_ARM::MBED-BUILD
+ * K64F::GCC_ARM::MBED-OS-FEATURES-FEATURE_LWIP-TESTS-MBEDMICRO-NET-CONNECTIVITY
+ <trace removed>
+ * K64F::GCC_ARM::MBED-OS-FEATURES-TESTS-FILESYSTEM-FAT_FILE_SYSTEM
+ * K64F::GCC_ARM::MBED-OS-FEATURES-TESTS-FILESYSTEM-HEAP_BLOCK_DEVICE
+ * K64F::GCC_ARM::MBED-OS-FEATURES-TESTS-FILESYSTEM-UTIL_BLOCK_DEVICE
+ <trace removed>
+ * K64F::GCC_ARM::SD-DRIVER-FEATURES-TESTS-FILESYSTEM-BASIC
+ * K64F::GCC_ARM::SD-DRIVER-FEATURES-TESTS-FILESYSTEM-FOPEN
+
+ Build skips:
+ * K64F::GCC_ARM::MBED-OS-FEATURES-FEATURE_LWIP-TESTS-MBEDMICRO-NET-TCP_PACKET_PRESSURE
+ <trace removed>
+
+
+Notice the following tests in the sd-driver tree are listed above:
+
+- `K64F::GCC_ARM::SD-DRIVER-FEATURES-TESTS-FILESYSTEM-BASIC`
+- `K64F::GCC_ARM::SD-DRIVER-FEATURES-TESTS-FILESYSTEM-FOPEN`
+
+
+The FAT32/SDCard test cases are at following locations in the source code tree:
+
+ /d/demo_area/ex_app1/sd-driver/features/TESTS/filesystem/basic/basic.cpp
+ /d/demo_area/ex_app1/sd-driver/features/TESTS/filesystem/fopen/fopen.cpp
+
+
+#### <a name="settting-repos-to-compatible-versions"></a> Setting mbed-os/sd-driver Repositories To Compatible Versions
+
+The sd-driver master HEAD and the mbed-os master HEAD should be compatible
+with one another and therefore no specific tagged versions need to be checked out.
+However, in the case that you experience problems building, checkout out the compatible
+tagged version of each repository, as shown below:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ pushd mbed-os
+ simhug01@E107851:/d/demo_area/ex_app1$ git checkout tags/mbed-os-5.4.0
+ simhug01@E107851:/d/demo_area/ex_app1$ popd
+ simhug01@E107851:/d/demo_area/ex_app1$ pushd sd-driver
+ simhug01@E107851:/d/demo_area/ex_app1$ git checkout tags/sd-driver-0.0.2-mbed-os-5.4.0
+ simhug01@E107851:/d/demo_area/ex_app1$ popd
+
+In the above:
+
+- `mbed-os-5.4.0` should be replaced with the latest mbed-os release tag.
+- For an mbed-os release tag `mbed-os-x.y.z`, use the equivalent sd-driver tag `sd-driver-a.b.c-mbed-os-x.y.z`
+ where `a.b.c` is the latest version code for the `mbed-os-x.y.z` tag.
+
+### <a name="greentea-insert-sdcard-into-k64f"></a> Insert SDCard into K64F for Greentea Testing
+
+See the previous section for [Insert SDCard into K64F](#insert-sdcard-into-k64f) for details.
+
+
+### <a name="run-the-posix-file-test-cases"></a> Run the POSIX File Test Case
+
+To setup for running the test cases, connect the K64F development board to your
+PC using a suitable USB cable.
+
+All tests can be run using the following command:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ mbedgt -VS
+ <trace removed>
+
+However, it's possible to run a particular test case using the following form of the mbedgt command:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ mbedgt -VS --test-by-names=<test-name>
+
+The names of the tests can be listed using:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ mbedgt -VS --list
+
+For example, to run the basic test use:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ mbedgt -VS --test-by-names=sd-driver-features-tests-filesystem-basic
+
+To run the fopen test use:
+
+ simhug01@E107851:/d/demo_area/ex_app1$ mbedgt -VS --test-by-names=sd-driver-features-tests-filesystem-fopen
+
+On a successful run, results similar to the following will be shown:
+
+ mbedgt: test suite report:
+ +--------------+---------------+-------------------------------------------+--------+--------------------+-------------+
+ | target | platform_name | test suite | result | elapsed_time (sec) | copy_method |
+ +--------------+---------------+-------------------------------------------+--------+--------------------+-------------+
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | OK | 151.46 | shell |
+ +--------------+---------------+-------------------------------------------+--------+--------------------+-------------+
+ mbedgt: test suite results: 1 OK
+ mbedgt: test case report:
+ +--------------+---------------+-------------------------------------------+----------------------------------------------------------------------------------------+--------+--------+--------+--------------------+
+ | target | platform_name | test suite | test case | passed | failed | result | elapsed_time (sec) |
+ +--------------+---------------+-------------------------------------------+----------------------------------------------------------------------------------------+--------+--------+--------+--------------------+
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_01: fopen()/fwrite()/fclose() directories/file in multi-dir filepath. | 1 | 0 | OK | 7.57 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_02: fopen(r) pre-existing file try to write it. | 1 | 0 | OK | 0.2 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_03: fopen(w+) pre-existing file try to write it. | 1 | 0 | OK | 0.41 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_04: fopen() with a filename exceeding the maximum length. | 1 | 0 | OK | 0.11 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_06: fopen() with bad filenames (minimal). | 1 | 0 | OK | 0.1 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_07: fopen()/errno handling. | 1 | 0 | OK | 0.07 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_08: ferror()/clearerr()/errno handling. | 1 | 0 | OK | 0.1 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_09: ftell() handling. | 1 | 0 | OK | 0.17 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_10: remove() test. | 1 | 0 | OK | 1.28 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_11: rename(). | 1 | 0 | OK | 2.3 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_12: opendir(), readdir(), closedir() test. | 1 | 0 | OK | 3.57 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_13: mkdir() test. | 1 | 0 | OK | 1.21 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_14: stat() test. | 1 | 0 | OK | 1.47 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_15: format() test. | 1 | 0 | OK | 26.12 |
+ | K64F-GCC_ARM | K64F | sd-driver-features-tests-filesystem-fopen | FSFAT_FOPEN_TEST_16: write/check n x 25kB data files. | 1 | 0 | OK | 87.11 |
+ +--------------+---------------+-------------------------------------------+----------------------------------------------------------------------------------------+--------+--------+--------+--------------------+
+ mbedgt: test case results: 15 OK
+ mbedgt: completed in 152.35 sec
+
+
+# <a name="summary-posix-api-documentation"></a> Summary of POSIX File API Documentation
+
+### POSIX File API
+
+mbed OS supports a subset of the POSIX File API, as outlined below:
+
+- [clearerr()](https://linux.die.net/man/3/clearerr).
+ - STATUS: Basic testing implemented. Working.
+- [fclose()](https://linux.die.net/man/3/fclose).
+ - STATUS: Basic testing implemented. Working.
+- [ferror()](https://linux.die.net/man/3/clearerr).
+ - STATUS: Basic testing implemented.
+ - STATUS: GCC_ARM: Working.
+ - STATUS: ARMCC: ARMCC has problem with ferror(filep) where filep is NULL. Appears to work for non-NULL pointer.
+- [fgetc()](https://linux.die.net/man/3/fgets).
+ - STATUS: Basic testing implemented. Working.
+- [fgets()](https://linux.die.net/man/3/fgets).
+ - STATUS: Basic testing implemented. Working.
+- [fputc()](https://linux.die.net/man/3/fputs).
+ - STATUS: Unknown.
+- [fputs()](https://linux.die.net/man/3/fputs).
+ - STATUS: Basic testing implemented. Working.
+- [fprintf()](https://linux.die.net/man/3/fprintf).
+ - STATUS: Basic testing implemented. Working.
+- [fopen()](https://linux.die.net/man/3/fopen).
+ - STATUS: Basic testing implemented. Working.
+- [freopen()](https://linux.die.net/man/3/fopen).
+ - STATUS: This is not tested.
+- [fread()](https://linux.die.net/man/3/fread).
+ - STATUS: Basic testing implemented. Working.
+ - STATUS: n x 25kB stress test working.
+- [ftell()](https://linux.die.net/man/3/ftell).
+ - STATUS: Basic testing implemented. Working.
+- [fwrite()](https://linux.die.net/man/3/fwrite).
+ - STATUS: Basic testing implemented. Working.
+ - STATUS: n x 25kB stress test working.
+- [fseek()](https://linux.die.net/man/3/fseek)
+ - STATUS: Basic testing implemented. Working.
+- [getc()](https://linux.die.net/man/3/fgets).
+ - STATUS: Basic testing implemented. Working.
+- [gets()](https://linux.die.net/man/3/fgets).
+ - STATUS: Unknown.
+- [putc()](https://linux.die.net/man/3/fputs).
+ - STATUS: Unknown.
+- [puts()](https://linux.die.net/man/3/fputs).
+ - STATUS: Unknown.
+- [remove()](https://linux.die.net/man/3/remove)
+ - STATUS: Basic testing implemented. Working.
+- [rewind()](https://linux.die.net/man/3/rewind).
+ - STATUS: Basic testing implemented. Working.
+- [stat()](https://linux.die.net/man/2/stat)
+ - STATUS: Implemented. Working.
+ - STATUS: Not supported by ARMCC/IAR libc.
+- [tmpfile()](https://linux.die.net/man/3/tmpfile).
+ - STATUS: Not implemented.
+- [tmpnam()](https://linux.die.net/man/3/tmpnam).
+ - STATUS: Not implemented.
+
+Supported directory related operations are as follows:
+
+- [closedir()](https://linux.die.net/man/3/closedir).
+ - STATUS: Implemented. Working.
+- [mkdir()](https://linux.die.net/man/3/mkdir).
+ - STATUS: Basic testing implemented. Working.
+- [opendir()](https://linux.die.net/man/3/opendir).
+ - STATUS: Implemented. Working.
+- [readdir()](https://linux.die.net/man/3/readdir).
+ - STATUS: Implemented. Working.
+- [remove()](https://linux.die.net/man/3/remove).
+ - STATUS: Basic testing implemented. Working.
+- [rename()](https://linux.die.net/man/3/rename).
+ - STATUS: Implemented. Not tested.
+- [rewinddir()](https://linux.die.net/man/3/rewinddir).
+ - STATUS: Implemented. Found not to work. Test case not present in repo.
+- [seekdir()](https://linux.die.net/man/3/seekdir).
+ - STATUS: Implemented. Found not to work. Test case not present in repo.
+- [telldir()](https://linux.die.net/man/3/telldir).
+ - STATUS: Implemented. Found not to work. Test case not present in repo.
+
+### errno
+
+Basic errno reporting is supported, tested and known to be working.
+
+
+# Related Projects Resources
+
+The following are related mbed storage projects and useful resources:
+
+- The [mbed-os](https://github.com/ARMmbed/mbed-os) main repository.
+- The [mbed-os-example-fat-filesystem](https://github.com/ARMmbed/mbed-os-example-fat-filesystem) repository.
+ This is an example project for the mbed OS FAT filesystem.
+- The [spiflash-driver](https://github.com/armmbed/spiflash-driver) repository.
+- The [i2ceeprom-driver](https://github.com/ARMmbed/i2ceeprom-driver.git) repository.
+- The [ci-test-shield](https://github.com/ARMmbed/ci-test-shield) repository. This is the project describing
+ the mbed-os Continuous Integration test shield, together with standard tests.
+- The [mbed-HDK](https://github.com/ARMmbed/mbed-HDK) repository containing Hardware Development Kit resources
+ including the schematics for the CI test shield.
+- [POSIX File Interface ISO/IEC 9899:TC2 Documentation](http://www.eng.utah.edu/~cs5785/slides-f10/n1124.pdf).
+- [FATFS: Generic FAT File System Module used in mbed OS](http://elm-chan.org/fsw/ff/00index_e.html)
+
+