Class D adcDelSig>Filter>Pwm using DMA only

Anonymous · ‎Aug 24, 2017

Hi, this is my first project and am having a bit of a struggle getting this to work. Basically the adc is differential with an audio input sampled at 192Ksps>Filter for Low Pass.

The problem occurs trying to get the Filter value out of the DMA to the Pwm compare1 register.

I am attaching the project bundle.

Any help or pointers would be very much appreciated.

Thanks in Advance

Al

odissey1 · ‎Aug 28, 2017

I modified T. Dust demo to include 2s-compliment to binary offset conversion using Control register. Project uses hardware input PWM (using custom component made by JLS1), but can be further modified to use DMA transfer. I think this is enough to start with.

PWM ouptut w/o and with external 0.1uF bypass capacitor (too big?).

P.S. Project updated (PWM pin is relocated and set to resistive pull up/down).

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Class D adcDelSig&gt;Filter&gt;Pwm using DMA only

Class D adcDelSig>Filter>Pwm using DMA only

Re: Class D adcDelSig>Filter>Pwm using DMA only

Class D adcDelSig>Filter>Pwm using DMA only