Preparing Your Device for USBwatch

Preparing Your Peripheral Hardware

Your preipheral device’s printed circuit board must have an RS-232 port on it, correctly configured to be able to communicate with a PC. A Microchip PicDem USB board can be used, if it is connected to a Null Modem. (We use a Radio Shack 9-pin Null Modem, followed by a F/F gender changer.)

If you are using a demo board like microEngineering Labs’ PicProto USB board which doesn’t have RS-232 interface already on it, but which does have a prototyping area, you can add the simple circuitry yourself. We show you how.

Preparing Your Peripheral Software

USBwatch has two software elements:

• a number of small code snippets in the USB peripheral’s firware, that transmits a few highly encoded bytes out the hardware serial port to describe each USB transaction, and
• the PC side USBwatch program that reads, interprets, and displays this information on a PC (which may or may not be the same PC that acts as the USB host to the peripheral device).

Peripheral programs generated by HIDmaker contain code with conditional compile directives that can be set to activate the USBwatch capability. With some languages, the process is controlled entirely by just #define-ing a single item called USB_WATCH. If this item is defined, then the USBwatch code will be compiled and activated.

You're ready to go!

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