Flash As3 Serial Communication Protocol

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Access Flash Drives with a Microcontroller Jan Axelson This article originally appeared in. USB flash drives provide a handy way to store any type of information in a small package. The drives, also known as thumb drives and USB keys, seem ideal for use in data loggers and other microcontroller-based projects. But to access files in a flash drive, a microcontroller must have USB host hardware and support for a file system.

Microcontroller-based devices often lack these elements. To the rescue is the USBwiz chip from GHI Electronics. With the USBwiz, just about any microcontroller can read and write to files in flash drives.

The microcontroller can access the USBwiz via an asynchronous serial (UART) port or an SPI or I2C port. Most microcontrollers support one or more of these ports. The USBwiz can also access USB hard drives and flash-memory cards such as MultimediaCards (MMCs) and Secure Digital (SD) Cards. In this article, I'll show how to use the USBwiz to create a file in a flash drive, write to the file, and read the file's contents. I'll also show how to control the USBwiz from a PC using a terminal utility or Visual Basic. When you have working code on the PC, you can port the code to your microcontroller of choice. About Flash Drives and USB A USB flash drive is a USB device that contains flash memory that PCs and other USB hosts can access in the same way as other drives.

If you attach a flash drive to a USB port on a PC, Windows assigns a drive letter and shows the drive in My Computer. Current flash drives have capacities as large as 8 gigabytes, which is more than enough for the data a small system might need to store and access. Every USB communication is between a host and a device.

The host contains host-controller hardware and manages communications on the bus. The device contains device-controller hardware and responds to communications from the host. Host hardware and code are more complex than device hardware and code. PCs contain host controllers and thus can communicate with USB devices, including flash drives. Most microcontrollers with USB support contain device controllers. A microcontroller that wants to access flash drives or other USB devices must have a host controller embedded in the microcontroller or accessed on a separate chip. This is where the USBwiz comes in.

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Inside the USBwiz The USBwiz is a programmed Philips LPC2141 microcontroller based on a 16/32-bit ARM processor core. For USB communications, the chip interfaces to a Philips ISP1160 USB host controller.

Flash As3 Serial Communication Protocol

The USBwiz-OEM board contains both chips, two USB connectors, a connector for an SD Card or MultiMediaCard, and a user interface that brings out connections for powering and communicating with the circuits. The user interface is a line of holes that accepts an 18-pin SIP header (which you provide). You can plug the header into a breadboard or mating receptacle or solder the header directly to a circuit board. Provides free USBwiz firmware that supports a command set for communicating with the board. All commands and responses are ASCII text. A bootloader program loads the firmware into the USBwiz from an SD Card or MultiMediaCard.

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