dac_continuous_lptmr_edma
Overview
The demo shows how to use the LPTMR to generate a DAC trigger and use the DMA to transfer data into DAC buffer.
In this example, DAC is first set to normal buffer mode. LPTMR is as DAC hardware trigger source and DMA would work when DAC read pointer is zero. When run the example, the DAC is triggered by LPTMR and the read pointer increases by one, every time the trigger occurs. When the read pointer reaches the upper limit, it goes to zero directly in the next trigger event. While read pointer goes to zero, DMA request will be triggered and transfer data into DAC buffer. The user should probe the DAC output with a oscilloscope to see the Half-sine signal.