Rapid Prototyping Solutions Seminars

Rapid Prototyping Solutions USB and MFS Stacks

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Module Objectives ►

This session describes the USB capabilities that are available when using MQX

►

Describes how the MQX File System stack can interact with a USB stack

►

Presents a hands-on lab with writing data to a USB Flash Stick

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Module Agenda ►

USB Host ► USB Device ► MFS ► USB and File System Lab

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Module Agenda ►

USB Host ► USB Device ► MFS ► USB and File System Lab

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MQX Host USB ► Implements

USB 2.0 version ► Layered architecture • scalability (choose only components needed in application) • portability (class drivers independent on underlying hardware) ► Class • • • •

drivers supported: HID devices (mouse, keyboard) MSD devices (flash disk) HUB support (transparent communication through HUB) CDC devices (serial communication)

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Demo Applications Available ► Mouse ► Keyboard ► Mass

Storage Device ► CDC Serial

► Found

in \usb\host\examples

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MQX USB Host Structure User Application

HUB

MFS

Other to be developed

Intermediate I/O Drivers

MSD

HID

CDC

Host Class Drivers

HOST API (class level)

Hardware Independent Layer

USB 2.0 Chapter 9 API OS and HW-level HOST API USB Module (low-level drivers)

KHCI (Kirin2U/Kirin3specific controller)

EHCI (Enhanced Host Controller Interface)

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Other (OHCI, ...)

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Module Agenda ►

USB Host ► USB Device ► MFS ► USB and File System Lab

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Stack Features

►

All USB-IF chapter 9 compliance

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USB Class Support • Human Interface Device (HID) • Communication Data Class – Abstract Control Model (CDC – ACM) • PHDC (Personal Health Care Device Class) • MSD (Mass Storage Support)

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Demo Applications available ►Mouse ►USB

to Serial ►USB Network Adapter ►Weigh Scale (IEEE 11073 – 20601, IEEE 11073 - 10415) ►RAM Disk

► Found

in \usb\device\examples

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Architecture Overview

Applications

Mouse

Medical

Communication

Storage

Class API HID

PHDC

CDC

MSD

Device API

USB Device Stack Library

Device Layer

Controller API mcf5229x

mcf54455

-----

Low level driver

HW Register IF V2 USB IP

V4 USB IP

-----

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USB IP

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Device Layers - USB Descriptors, endpoint information - USB Application implementing class specific callbacks - USB Class API user

Application

- USB Framework Module implementation (USB Ch9, Control Endpoint …) Class

- USB generic class implementation (Suspend/Resume/Reset ….) - USB function specific implementation (Non Control Endpoint Request, Class specific Request) - USB Device API user

Device Layer

- Abstracts Hardware specific details and provides generic USB interfaces to the upper layer - Allows easy port of Applications/Class functionality over different USB IPs

Low level driver

- USB Controller IP interfacing module. - candidate to change for every new USB IP

USB Hardware

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Module Agenda ►

USB Host ► USB Device ► MFS ► USB and File System Lab

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MFS structure Files and directories

MFS

Partition manager (optional)

Device

Hardware Flash cards

USB mass storage devices

ATA PCMCIA

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Removable hard drives

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MFS Features ► Standard

FAT12, FAT16 and FAT32 support ► Standard handling of directory paths • Both \ and / can be used as directory separators • Support for * and ? wildcard characters ► File Attributes Supported • Standard: Directory, Read-only, Hidden File, System file, Archived file • Special: Volume Label file (only one such file allowed in root directory) ► File Time and Date • Each file entry contains 16-bit time and date fields. ► FAT Copies • MFS updates as many FATs as configured for. Only reads the first FAT. ► High-Level Formatting • An application can perform high-level formatting on a disk by calling ioctl(). ► Partition Manager • Support for multiple partitions on one physical drive

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Device ►

Devices usable by MFS • MFS can be installed on any memory-oriented device which  is standard MQX IO device in terms of open/close/read/write/ioctl calls  is able to “seek” on any given position  supports few block-oriented IOCTL •

Devices supported today  ATA PC Card flash cards  USB mass storage devices  RAM or MRAM  FlashX driver working with internal or external Flash memory  SPI-based SD Cards

•

Code under development (or legacy not-tested code)  ATA hard drives  floppy-disk drives

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MFS – API ►Basic

MFS API



_io_mfs_install - initializes MFS and allocates memory for all of the internal MFS data structures.



_io_mfs_uninstall - uninstalls the MFS device driver and frees the memory context.



fopen - Opens the device by specifying device name or opens a file if both device name and file path is specified. fd_ptr = fopen(“mfsram:\data\march\March2000results.data”, “w”);



fclose – Closes the file and frees the memory allocated by given FILE_PTR



ioctl – File- or device-specific control interface.

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Module Agenda ►

USB Host ► USB Device ► MFS ► USB and File System Lab

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Hands-On ► Follow

the USB Lab document to read and write to a USB flash drive

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Summary ►

Learned about the USB capabilities that are available when using MQX ► Described how the MQX File System stack can interact with a USB stack ► Performed a hands-on lab with writing data to an USB Flash Stick

Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc. 2009.

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