ADC FAST SAMPLING AND DMA

Hi people, i have EK-RA6M4. I have a PWM with 1KHz frequency with 5% duty cycle. I need to use ADC to measure the positive half of the PWM, collect up to 400 samples in 2ms for accuracy sake and transfer the results via DMA. I understand i need to trigger the ADC with a timer and ELC. But i want to understand how this actually works and the DMA part as well.

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