The DAC works !!

things in the code you should make sure they work: 

The setup 

Connected to a multimeter 

Multimeter will give exact measurements! 

The format - 

The first test case - 

what is the resolution ? 

2.5 / 2^12 for one bit . and calculate the others from this ! it's around 0.001 volts ! 

check the precision! 

the values are as follows