Arduino library for managing AD9833 Programmable Waveform Generator by Analog Devices.

The AD9833 is a low power, programmable waveform generator capable of producing sine, triangular, and square wave outputs. The output frequency, phase and all other parameters are software programmable through an SPI interface.

This library features access to all on-chip features though an abstracted class and methods to coordinate register changes to implement user-level functionality.

Modified by [email protected], June 2020

Modification allows an independent functionning of ON and OFF functions. Still 100% compatuble with the original library:

• introduced a new mode MODE_ON to complement an existing MODE_OFF.
• added a new method setModeSD(mode_t mode) to accompany the existing setMode() function. In the new method I've removed bitClear for D_SLEEP1 and AD_SLEEP12 bits (disabled ON function) for the following modes that essentially are used to change the form of the signal: MODE_SINE, MODE_SQUARE1, MODE_SQUARE2, MODE_TRIANGLE. Now, if the output signal is switched OFF, it would not get ON by changing the form of the output signal (as it is happening by using the stock setMode() function).

So, the signal can be separately switched on and off by the following commands (also works with the stock setMode() function):

// switch ON the output module signal
sigGen.setModeSD( MD_AD9833::MODE_ON ); 
or
// switch ON the output module signal
sigGen.setMode( MD_AD9833::MODE_ON ); 

// switch OFF the output module signal
sigGen.setModeSD( MD_AD9833::MODE_OFF ); 
or
// switch OFF the output module signal
sigGen.setMode( MD_AD9833::MODE_OFF ); 

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