USB host mass storage class (MSC) example

NXP Semiconductors and OnChip Technologies have partnered to provide USBHostLite software for our LPC1000, LPC2000, and LPC3000 families of microcontrollers with USB host capability. These include the LPC1766, the LPC2388, the LPC24xx series, the LPC29xx series, the LPC3180/01, and the LPC32xx series of miccontrollers. USBHostLite is a stripped-down USB host stack that includes only USB mass storage class support with the bare minimum code to run in a OS-less environment. USBHostLite provides a simple solution for accessing the files on USB mass storage devices such as USB Pen Drives, USB Hard Disk Drives, etc., connected to the LPC2388/24xx USB Host port.

The USBHostLite supports the following features:

• Runs without any operating system
• Contains small memory footprint
• Source code is written in ANSI C and is independent of IDE
• Supports control and bulk transfers
• Supports FAT16 file system
• Simple File APIs allow file read and write operations
• Well structured and easily understandable source code

The complimentary USBHostLite from NXP has following limitations:

• USBHostLite is only tested on Embedded Artists's LPC2400 OEM board with NXP LPC246x microcontrollers on it.
• Classes other than the mass storage are not supported.
• The mass storage interface must be present in the first configuration.
• Max Logical Unit Number (LUN) greater than zero not supported.
• File systems other than FAT16 are not supported.
• Long filenames are not supported.
• Files located in folders other than root directory cannot be accesed.
• The buffer size used in the application must not exceed 4KB.

• AN10703 NXP USB host lite, V1 (Jul 14, 2008)

USBHostLite for LPC source code is free to NXP customers for unlimited use with NXP LPC2000 and LPC3000 families of microcontrollers only. By downloading or using the USBHostLite software, you agree to use it solely with these NXP microcontrollers.

• USBHostLite, VBeta 1.0 (Feb 11, 2008)

For customer applications requiring full featured and production quality embedded USB stacks, OnChip Technologies LLC provides embedded USB Host/Device/OTG stacks that are fully compliant with the USB specifications and offers great degree of stability and configurability.

This software is provided AS-IS by NXP Semiconductors. NXP Semiconductors does not support or warrant the software contained herein for any purpose other than for informational use. Please contact OnChip Technologies LLC for further assistance including support options and other embedded USB host/device/OTG stacks.

• OnChip Technologies LLC

• CMX Systems CMX-USB Host
• HCC Embedded USB (EUSB) HostLite Stack
• Micrium μC/USB Host
• Micro Digital smxUSBH
• Thesycon Embedded USB Host Stack