Output_pwm (Audio Library) technical question

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Frank B

Senior Member
Hi, Paul,
I have a technical question about output_pwm (Audio Library).
As I understand it, the FTM is set to a frequency of 88.2 kHz.
I don't quite understand why ?
DMA writes both PWM registers per minor loop. But the DMA is also triggered with 88,2kHz, so the sampling frequency should be 88,2Khz as well - Somewhere I have an understanding problem... can you help me? How does this work?
 
Hi, Paul,
I have a technical question about output_pwm (Audio Library).
As I understand it, the FTM is set to a frequency of 88.2 kHz.
I don't quite understand why ?
DMA writes both PWM registers per minor loop. But the DMA is also triggered with 88,2kHz, so the sampling frequency should be 88,2Khz as well - Somewhere I have an understanding problem... can you help me? How does this work?

To answer my own Question - it's for easier filtering (external), I think now.

Thanks.
 
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