stm32h7_spi...fer_one_poll(9)

📦 version 7.3.1, in nixpkgs unstable

💅 stm32h7_spi_transfer_one_poll(9) 💅

okay so bestie, welcome to the Kernel API Manual — we're doing a deep dive on a lil function from the drivers/spi corner of the kernel, and honestly? she's iconic. no interrupts, no drama, just vibes and register pokes. 🎀

✨ NAME ✨

stm32h7_spi_transfer_one_poll — transfer a single spi_transfer by direct register access without interrupt usage 🦋

like… she moves the data herself. no IRQ middleman. main character energy fr fr. 👑

🌸 SYNOPSIS 🌸

int stm32h7_spi_transfer_one_poll (struct stm32_spi *spi );

yes that's the whole signature. short, sweet, slays. 💅

🫶 ARGUMENTS 🫶

  • spi — pointer to the spi controller data structure. that's your girl, the whole controller, right there in a struct. keep her safe. 🥺

💖 DESCRIPTION 💖

okay so listen closely bestie, this is the important part:

It must return 0 if the transfer is finished, or 1 if the transfer is still in progress.

that's it. that's the contract. 0 = done slay, 1 = not yet, keep polling. no cap. ⭐

lowkey the word "must" is doing a lot of heavy lifting there — the caller is out here checking your return value every loop, so don't get creative with it. 🙈

🎀 SEE ALSO 🎀

the whole friend group 💜 — go say hi, they're all in the kernel file ./drivers/spi/spi-stm32.c:

and that's the whole page, bestie!! 🧚✨ iykyk — this little cutie lives in ./drivers/spi, the manual says October 2026, and it's all from the Kernel API Manual. go poll some registers responsibly. mwah. 💋🍓

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