Quick Start Guide for Using DMA with ADC/DAC

The supported board list:

SAM D21 Xplained Pro
SAM D11 Xplained Pro
SAM L21 Xplained Pro
SAM DA1 Xplained Pro
SAM C21 Xplained Pro

This quick start will convert an analog input signal from AIN4 and output the converted value to DAC on PA2. The data between ADC and DAC with be transferred through DMA instead of a CPU intervene.

The ADC will be configured with the following settings:

1/2 VDDANA
Div 16 clock prescaler
10-bit resolution
Window monitor disabled
No gain
Positive input on ADC AIN4
Averaging disabled
Oversampling disabled
Right adjust data
Single-ended mode
Free running enable
All events (input and generation) disabled
Sleep operation disabled
No reference compensation
No gain/offset correction
No added sampling time
Pin scan mode disabled

The DAC will be configured with the following settings:

Analog V_CC as reference
Internal output disabled
Drive the DAC output to PA2
Right adjust data
The output buffer is disabled when the chip enters STANDBY sleep mode

The DMA will be configured with the following settings:

Move data from peripheral to peripheral
Using ADC result ready trigger
Using DMA priority level 0
Beat transfer will be triggered on each trigger
Loopback descriptor for DAC conversion