This document describes the features and operations of the enhanced direct memory access (EDMA3) controller in the TMS320DM643x Digital Media Processor (DMP).

在TMS320F28335中，利用ePWM控制ADC采样速率，转换完成，DMA控制器将数据从寄存器转移到内存中，并产生中断。-On chip TMS320F28335, control the adc sampling rate by ePWM. when the conversion is complete, call the DMA controller to transfer the data into memory. After that, initiate an interrupt.

利用28335自带的ADC采集两路模拟正弦信号，用DMA方式将采样值写入内存，用epwm控制采样周期。利用FFT求得两路正弦信号的相位差。-Sampling two analog sinusoidal signals, write them to the memory by DMA controller. The sampling period is controlled by the EPWM module. Calculate the phase difference by FFT meth