About frnt

frnt · 2023-09-11

Hello,I measured the performance of uSD card connected through the SPI on Read/Write operation.The weird thing is that the Block read speed is 3x to 4x slower than the write speed. I'm writing/read 4kB of data and the SD card is formatted with 4kB a...

frnt · 2023-08-29

Hello,I would like to design a microphone array with up to 16 microphones. I want to use the stm32h7a3zi board which has a lot of peripherals.I was looking at the DFSDM interface, but with only 8 channels / 8 filters up to 8 pdm microphones can be ha...

frnt · 2023-07-10

Hello,I’m wondering if there is a solution to expand the flash memory of the STM32WLEx. I have noticed that the microcontroller do not the Quad-SPI interface. Is there any other possibility to see the external memory as memory mapped?Any suggestion i...

frnt · 2023-03-31

Dear @Eleon BORLINI ,I’m currently using the I2S peripheral to acquire from a digital microphone.The I2S is configured as:24bits on 32bit data frame22kHz sampling frequencyand the pdm library is correctly configured and I’m able to convert a single ...

frnt · 2023-03-21

Hello,I'm using the IMP34DT05 microphone and it records fine but there is always a noise overlapped and it is very annoying.I have tried recording the background noise in anechoic chamber (see attached audio, high-pass filter alpha is 0.98). Do you k...

frnt · 2023-09-22

I'm sorry, here is the code of the read with CMDs sent:DRESULT SD_disk_read(BYTE pdrv, BYTE* buff, DWORD sector, UINT count) { /* pdrv should be 0 */ if (pdrv || !count) return RES_PARERR; /* no disk */ if (Stat & STA_NOINIT) return RES_NOTRDY;...

frnt · 2023-09-22

Is the function correct in your opinion?

frnt · 2023-09-19

@ONadr.1 I'll wait for the purchase. In the meantime, I have tried other micro-SD cards, but same slow speed in block read. I'm sharing the block read code, but to me it seems correct: static bool SD_RxDataBlock(BYTE *buff, UINT len) { uint8_t token...

frnt · 2023-09-12

Ok, I'll have a look at the Saleae.Could it be that fatfs does not use DMA for receiving data and using blocking calls?

frnt · 2023-09-12

Are there some important aspects to be considered in the block read except for the CMD18 command and CMD12 for stopping? I do not have a logic analyzer, I could have a look with the oscilloscope at one block transfer.

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Slow block read with SPI fatfs

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Microphone self noise IMP34DT05

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Re: Slow block read with SPI fatfs

Re: Slow block read with SPI fatfs

Re: Slow block read with SPI fatfs