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BSMX falling edge data not always available

I am working on an application using an STM32U5A5 nucleo board with four MEMs PDM output format microphones. The microphones are configured such that data is valid for the left channel on a rising clock edge and valid for the right channel on a falli...

jcmoreau by Associate II
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So clock output on MDF CKI1

I am trying to provide a clock to PDM microphones using the CKI1 MDF pin, and no clock is being generated. The MDF correctly generates a clock signal on MDF CKI0. The IO configuration for CKI0 and CKI1 is the same (except for the alternate function r...

jcmoreau by Associate II
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Resolved! PDM microphone and filter options

I have compared my platforms using PDM microphones related to PDM to PCM and filtering:Platform 1:STM32H747 (Portenta H7), with SW PDM2PCM filter (and optional to add post-processing)Platform 2:STM32U5A5 with ADF filter (in MCU) or external PCMD3180 ...

PDM_MIC_comparison.png PDM_Filter_compare_animated.gif

Resolved! STM32U5xx: ADF as PDM MIC input - mono and DC offset?

Using STM32U5A5 MCU and adding the ADF example (taken from en.stm32cubeu5-v1-4-0\STM32Cube_FW_U5_V1.4.0\Projects\STM32U575I-EV\Examples\MDF\ADF_AudioRecorder) seems to work.I have changed to use the PLL3 and setup 3,072MHz as PDM MIC CLK (for 48KHz s...

STM32U5A5_ADF_PDM.png

STM32U5A9 GPDMA unusable data with MDF

Hi, I'm trying to use AMC1336 Delta-Sigma Modulator with STM32U5A9 MDF. I have tried using polling and interrupts for data acquisition and got expected results. But when I tried switching to GPDMA the data jumped around and is not usable. I took 100 ...

IT_dc.PNG DMA_dc.PNG GPDMA_config.PNG MDF_config.PNG

MDF and ADF: input data from RAM

Is it possible to use the awesome MDF and/or ADF on STM32U5 with input data from RAM? I have not found any configuration for BSMX for this. One use case is an high performance external delta-sigma-demodulator (ADC) on SPI with proprietary data format...

FB1 by Associate II
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Resolved! Confusion with MDF and its SPI/Manchester setting

Hi all,We are trying to wire a microphone to the STM32U585. The microphone (T5838) outputs PDM and takes a clock as input.As far as I understand, the MDF peripheral supports PDM interface (as stated in RM046, Rev 4, 39.1), so it is compatible with th...

Resolved! Stoping MDF (ADF) clock output

Greetings,I'm using a low power microphone and would like to turn it off when not in use. That is done by turning off the clock to microphone, which is generated in ADF as output clock. Stopping sample acquisition (either by TRGO using window mode ac...

btd5 by Associate II
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