CCS/MSP430FR2355: DAC output using ADC data

Part Number: MSP430FR2355

Tool/software: Code Composer Studio

I am trying to output a ramp waveform using both the ADC and DAC together. The ADC would take voltage readings from 3 potentiometers and then calculate from those values and output the waveform through the DAC. I would like to do this for each element of the waveform, so that the adjustment is an active process. 

Is this possible?

I am trying to do this, and the DAC appears to be outputting correctly, but the ADC values appear to jump around.

Any help is appreciated.