AVR-DB-Blink-Switch-Demo

Arduino Blink with Switch Demo for the AVR128DB64 MCU

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// AVR-DB Blink-Switch Demo 
//
// Intended to run on the Electrodragon.com  AVR128DB64 development board
// https://www.electrodragon.com/product/avr128db64-mini-develpment-board-avr128/
// 
// using Spence Konde's DxCcre for the Arduino IDE.
// https://github.com/SpenceKonde/DxCore
//
// LED active high on PC6
//
// Push button switch active low on PC7
//
// Operation:  LED blinks at 1000 ms on, 1000 ms off.  Prints diagnostic
// message to console with every LED state change.  Pressing and holding
// the push button causes the LED to freeze (remain in current state)
// while button is in down position.
//
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