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AVR controlled DDS generator software writing

During my spare time, I am developing the program for the AVR controlled DDS generator. I decided to write software using the WinAVR tool-set. How far ahead I have moved with this? I have implemented: Menu system; Reading previous generator configuration from EEPROM; Setting signal mode; Storing last generator configuration to EEPROM to be loaded after reset; Four types of signal output (square, sawtooth, triangle, and sine wave); Things I still need to do: Ability to change signal frequency; Implement other signals (listed below); Make program clean-up;

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