About sb_st

sb_st · 2025-03-11

Hi there!I'm working on a project wherein I'm trying to play an audio file in reverse. I'm using freeRTOS, fatFS, and a 4-wire SDIO setup, and am doing this little file read dance where I:f_lseek() to the end of a filecalculate how many bytes I want ...

sb_st · 2025-01-28

Hi! I am trying to learn about interfacing with an stm32f405 as a USB Mass Storage Device. My (homemade) development board has an onboard microSD card slot, and so I would like to present the card as my mass storage. I'm running into some problems wi...

sb_st · 2025-01-14

Hello!I am writing a driver for the mt6701ct rotary magnetic encoder, using cubeIDE and an stm32f405 MCU. This sensor communicates via SSI, which is to say that it's read-only (MISO-only; there is no physical connection to MOSI). Using a simple polli...

sb_st · 2024-12-16

Hi;I have a tlv493d magnetic encoder, with which I would like to communicate via i2c with an stm32f4 MCU. I can successfully initiate communication with this sensor via I2c, to perform an initial configuration of the sensor. I can verify this by way ...

sb_st · 2024-12-01

Hello;I'm writing a driver for a tlv493d magnetic encoder using CubeIDE. This encoder has a peculiarity where it pulls the SCL line of an i2c bus low when it has data ready to be read, at which point the MCU needs to initiate an i2c receive transacti...

sb_st · 2025-03-11

Optimization here might have more to do with how much memory you can commit to the task, whether you can manage the backwardness via memory access instead of file access, or swapping in-situ.Thank you, yes I'm investigating what's involved in extendi...

sb_st · 2025-03-11

@Tesla DeLorean wrote:Need to be reading substantively large blocks, whose physical alignment (start) is aligned to cluster or sector boundaries.Oh interesting; are you saying the non-uniformity of these reads is because I might not be landing exactl...

sb_st · 2025-01-29

Hm, digging through the forums, this "1-bit works, 4-bit doesn't" problem seems pretty commonly reported, and commonly traced to a HAL issue, rather than a hardware issue. This solution:https://community.st.com/t5/stm32cubemx-mcus/sdio-interface-not-...

sb_st · 2025-01-16

Welp, I set out to learn something and I did, so I'll take the win in the failure.

sb_st · 2025-01-15

Oh good question, thanks - I think this led me to a great clue!Yes, to your first question: as I mentioned in my initial post, the sensor works fine using SPI in a polling fashion. I can get data, parse it, check the CRC, get a floating-point angle. ...

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Reading a file backwards

SDIO, USB Mass Storage, and Mac

SSI and Circular DMA

I2C and interrupts on SCL

stm32f4 interrupts and i2c

Re: Reading a file backwards

Re: Reading a file backwards

Re: SDIO, USB Mass Storage, and Mac

Re: SSI and Circular DMA

Re: SSI and Circular DMA