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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► USB Host
► USB Device
► MFS
► USB and File System Lab
Module Agenda
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► USB Host
► USB Device
► MFS
► USB and File System Lab
Module Agenda
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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 <mqx_install_dir>\usb\host\examples
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HUB
MQX USB Host Structure
User Application
MFS
Other to be developed
Intermediate
I/O Drivers
MSD HID CDC
Host Class
Drivers
HOST API (class level)
USB 2.0 Chapter 9 API
OS and HW-level HOST API
Hardware
Independent
Layer
KHCI (Kirin2U/Kirin3specific controller)
EHCI (Enhanced Host
Controller Interface)
USB Module (low-level drivers)
Other (OHCI, ...)
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► USB Host
► USB Device
► MFS
► USB and File System Lab
Module Agenda
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Stack Features
► All USB-IF chapter 9 compliance
► 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 <mqx_install_dir>\usb\device\examples
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Architecture Overview
Applications
USB
Device
Stack
Library
Mouse
HID
Medical
PHDC
Communication
CDC
Storage
MSD
Class API
Device API
Device Layer
Controller API mcf5229x mcf54455
V2 USB IP V4 USB IP
- - - - -
Low level driver
- - - - -
USB IP
HW Register IF
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Application
Class
Device Layer
Low level driver
USB Hardware
Device Layers
-
USB Descriptors, endpoint information
- USB Application implementing class specific callbacks
- USB Class API user
USB Framework Module implementation (USB Ch9, Control Endpoint …)
USB generic class implementation (Suspend/Resume/Reset ….)
- USB function specific implementation (Non Control Endpoint Request, Class specific Request)
- USB Device API user
- Abstracts Hardware specific details and provides generic USB interfaces to the upper layer
- Allows easy port of Applications/Class functionality over different USB IPs
- USB Controller IP interfacing module.
- candidate to change for every new USB IP
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► USB Host
► USB Device
► MFS
► USB and File System Lab
Module Agenda
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Files and directories
MFS
Partition manager (optional)
Device
Hardware
Flash cards
USB mass storage devices
ATA
PCMCIA
Removable hard drives
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MFS structure
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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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► 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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Device
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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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► USB Host
► USB Device
► MFS
► USB and File System Lab
Module Agenda
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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► Follow the USB Lab document to read and write to a USB flash drive
Hands-On
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► 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
Summary
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