NAME

       Demo projects -

   Modules
       A simple project
       A more sophisticated project
       Using the standard IO facilities
       Example using the two-wire interface (TWI)

Detailed Description

       Various small demo projects are provided to illustrate several aspects of using the opensource utilities
       for the AVR controller series. It should be kept in mind that these demos serve mainly educational
       purposes, and are normally not directly suitable for use in any production environment. Usually, they
       have been kept as simple as sufficient to demonstrate one particular feature.

       The simple project is somewhat like the 'Hello world!' application for a microcontroller, about the most
       simple project that can be done. It is explained in good detail, to allow the reader to understand the
       basic concepts behind using the tools on an AVR microcontroller.

       The more sophisticated demo project builds on top of that simple project, and adds some controls to it.
       It touches a number of avr-libc's basic concepts on its way.

       A comprehensive example on using the standard IO facilities intends to explain that complex topic, using
       a practical microcontroller peripheral setup with one RS-232 connection, and an HD44780-compatible
       industry-standard LCD display.

       The Example using the two-wire interface (TWI) project explains the use of the two-wire hardware
       interface (also known as 'I2C') that is present on many AVR controllers.

       Finally, the asmdemo demo shows how C and assembly language source files can collaborate within one
       project. While the overall project is managed by a C program part for easy maintenance, time-critical
       parts are written directly in manually optimized assembly language for shortest execution times possible.
       Naturally, this kind of project is very closely tied to the hardware design, thus it is custom-tailored
       to a particular controller type and peripheral setup. As an alternative to the assembly-language
       solution, this project also offers a C-only implementation (deploying the exact same peripheral setup)
       based on a more sophisticated (and thus more expensive) but pin-compatible controller.

       While the simple demo is meant to run on about any AVR setup possible where a LED could be connected to
       the OCR1[A] output, the large and stdio demos are mainly targeted to the Atmel STK500 starter kit, and
       the TWI example requires a controller where some 24Cxx two-wire EEPPROM can be connected to. For the
       STK500 demos, the default CPU (either an AT90S8515 or an ATmega8515) should be removed from its socket,
       and the ATmega16 that ships with the kit should be inserted into socket SCKT3100A3. The ATmega16 offers
       an on-board ADC that is used in the large demo, and all AVRs with an ADC feature a different pinout than
       the industry-standard compatible devices.

       In order to fully utilize the large demo, a female 10-pin header with cable, connecting to a 10 kOhm
       potentiometer will be useful.

       For the stdio demo, an industry-standard HD44780-compatible LCD display of at least 16x1 characters will
       be needed. Among other things, the LCD4Linux project page describes many things around these displays,
       including common pinouts.

Author

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