Where are they defined?

[dueszdt]

I only use the Arduino Due there is no external circuitry.
The program makes a sinusoidal signal to the output of the DAC.
No library is invited.

I started from this program for the most part. Essentially, I want to understand how this works.

Arduino Due DAC reset

I found this code on this page. It works. But it doesn't work anymore if I put an analogWrite in voidloop. How do I reset the DAC? #define    NWAVE               80 uint16_t  Sinewave[2][NWAVE] = {   {    +4095,   +4093,   +4089,   +4081,   +4070,   +4056,   +4038,   +4018,   +3995,   +3968,   +3939,   +3907,   +3872,   +3834,   +3793,   +3750,    +3704,   +3656,   +3605,   +3551,   +3495,   +3438,   +3377,   +3315,   +3251,   +3185,   +3118,   +3048,   +2977,   +2905,   +2831,   +2757,    +26…