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snowmonster · 2023-08-08

Hi.I am trying to implement RTC smooth calibration on STM32F446 MCU based board. Did look at the example "Real Time Clock (RTC) software expansion for STM32Cube (AN4759)" where smooth calibration is implemented using two timers. The first one counts...

snowmonster · 2023-07-02

Hi.I have few questions regarding SDIO and SD card write performance.I am using STM32F446 MCU and a simple application using polling SDIO that writes (appends) 32 blocks (16KB) of data to the SD card every 20ms. I do not use filesystem, just writing ...

snowmonster · 2023-08-08

LSE is used as RTC clock source.

snowmonster · 2023-08-07

But more than "why is ti happening" I'd like to figure out why I can't repeat same write faster. To me it looks like card is not ready, but it may also be related to my driver. I do send CMS12 (stop transmission) after any initiation of multi block w...

snowmonster · 2023-08-07

Thanks for your reply.1. What I meant, write speed probably should not change much between writes if made under same conditions.2. I am using Samsung PRO Endurance 32GB SD card. I think should be of high quality.3. I use SDIO (4-bit lane). Due to my ...

snowmonster · 2023-08-07

Hi.I doubt it would reach its max write speed since I write in relatively small bursts (32 blocks every 20ms, which takes write operation about 4ms). So, most of those writes are ok ... rarely they fail.Thanks for your reply, will check the clock, to...

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RTC smooth calibration on STMF446

SDIO multi block write fails sometimes

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