Useage of PROGMEM without pgm_read_xxx_xxx

[ryan4volts]

First off, excellent library, got me quick started with the board. I am still yet to "truly" work through the IC and its capabailities though and come to terms with whta I am actually looking at.

After playing around with your code and using a logic analyser, I found that beacuse you have stored all your const variables in PROGMEM, that the avr also requires a specific program memory read useage as well. In this case a good example is provided on
https://www.arduino.cc/reference/en/language/variables/utilities/progmem/

When doing the following line for instance:
statusValue = AD5934byteWrite(START_FREQUENCY_REGISTER[n], frequencyCode(freqInHz, n));
START_FREQUENCY_REGISTER is actually defrences as {0x04, 0x32, 0x00} instead of the intended {0x82, 0x83 and 0x84}.

A quick solution would be to remove the PROGMEM defitinitions entirely from, the header. Though a more long term solution is to use the painful API and use pgm_read_xxx_xxx everywhere through the app.

ACTUAL READ

Intended

Keep up the good work!
Ryan.