Any ideas why values would be non linear in the approximately the upper 1 to 2 bits?For the setup below, it is linear to between -17000 to +14000. Doubling the + output only yields around +18000. These are raw values. This really acts like an overflo...
I am working on a project where I would like to gather PCM data from 8 MEMS microphones, and naturally I found the DFSDM peripheral interesting. The PCM data will be sent over lightpipe ADAT using a SAI but this is out of scope of this post.This is b...
Yes, I have tried contacting the local ST sales reps here in Australia - no response.Sorry, I've resisted asking this question for a fair while because I know many have greater need. But I thought I would ask this question just in case there is a sec...
I am trying to read signals from digital MEMS microphones via DFSDM peripheral and transfer it to memory with DMA on STM32H7A3. I found out that 4 channels are handled by DMA and remaining 4 with BDMA. Now I can't figure out how to get this BDMA to ...
Hello STM32-Community,I'm currently using the SPH0641 Microphone alongside DFSDM. My DFSDM settings are:Sinc filter: Sinc 3 FilterIOSR: 8Divider = 79FOSR = 37with a clock frequency of 48 MHz and as a clocksource for DFSDM I've a sample rate of about ...
Using a STM32H7 and internal ADC through DFSDM using sinc3 filter and would like aliasing protection.The sinc filter has the notch at the new sample frequency. I would prefere to have the notch at half the new sampling frequency to get better aliasin...
I've managed to get the DFSDM working with a PDM microphone (on a STM32L496 board) - using direct access to registers. But the documentation often made things more difficult than they needed to be. Just a few extra sentences, less ambiguous language ...
Hi. I'm having trouble with integer interpretation for DFSDM. From the RM:> The offset correction allows to calibrate the external sigma-delta modulator offset error. The user configures the offset register with a signed 24-bit correction, and this r...
Hi,I followed the example for DFSDM found in DM00380469_ENV1.pdf and setup the channels as specified (channel 0/1 -> input from ch1 and internal clock). Cube MX also creates 2 pins , CLK and DATAIN1.STM32F413 MCUIt seems that I cant get any data comi...
Hi - I'm having trouble getting DFSDM input to work with DMA - I'm unable to set the `DMAEN` bit in the DFSDM register.One troubleshooting angle: What register pointer to you pass to the DMA's CPAR? I assume `DFSDM_ FLTxRDATAR` for regular (non-injec...