stm32h7_spi_write_txfifo(9)

💅 stm32h7_spi_write_txfifo(9)

okay so bestie, we're deep in the Kernel API Manual right now and today's main character is stm32h7_spi_write_txfifo — one tiny function in the STM32 SPI saga. grab a strawberry drink 🍓 and let's go.

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✨ NAME ✨

stm32h7_spi_write_txfifo — literally just writing bytes into the Transmit Data Register 🫶

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🎀 SYNOPSIS 🎀

void stm32h7_spi_write_txfifo (struct stm32_spi *spi );

that's it. that's the whole vibe check. no cap. ✨

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🦋 ARGUMENTS 🦋

• spi — pointer to the spi controller data structure. like, the whole controller's data struct. you hand it over and she does her thing 💅

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🔥 DESCRIPTION 🔥

okay so the important detail here, and you need to hear this one: the read from tx_buf depends on the remaining bytes. the way that matters is it avoids reading beyond the end of tx_buf — like, she checks how much room is actually left before she goes grabbing more, so she never overstays her welcome at the buffer party 🙈

no cap, that's the whole behavior. simple, iconic, does exactly what it says. 👑

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🌈 SEE ALSO 🌈

the whole friend group 🫶 — and the Kernel file ./drivers/spi/spi-stm32.c:

struct stm32_spi_reg(9), struct stm32_spi_regspec(9), struct stm32_spi_cfg(9), struct stm32_spi(9), stm32h7_spi_get_fifo_size(9), stm32f4_spi_get_bpw_mask(9), stm32f7_spi_get_bpw_mask(9), stm32h7_spi_get_bpw_mask(9), stm32mp25_spi_get_bpw_mask(9), stm32_spi_prepare_mbr(9), stm32h7_spi_prepare_fthlv(9), stm32f4_spi_write_tx(9), stm32f7_spi_write_tx(9), stm32f4_spi_read_rx(9), stm32f7_spi_read_rx(9), stm32h7_spi_read_rxfifo(9), stm32_spi_enable(9), stm32fx_spi_disable(9), stm32h7_spi_disable(9), stm32_spi_can_dma(9), stm32fx_spi_irq_event(9), stm32fx_spi_irq_thread(9), stm32h7_spi_irq_thread(9), stm32_spi_prepare_msg(9), stm32fx_spi_dma_tx_cb(9), stm32_spi_dma_rx_cb(9), stm32_spi_dma_config(9), stm32fx_spi_transfer_one_irq(9), stm32h7_spi_transfer_one_poll(9), stm32h7_spi_transfer_one_irq(9), stm32fx_spi_transfer_one_dma_start(9), stm32f7_spi_transfer_one_dma_start(9), stm32h7_spi_transfer_one_dma_start(9), stm32_spi_prepare_rx_dma_mdma_chaining(9), stm32_spi_transfer_one_dma(9), stm32f4_spi_set_bpw(9), stm32f7_spi_set_bpw(9), stm32h7_spi_set_bpw(9), stm32_spi_set_mbr(9), stm32_spi_communication_type(9), stm32fx_spi_set_mode(9), stm32h7_spi_set_mode(9), stm32h7_spi_data_idleness(9), stm32h7_spi_number_of_data(9), stm32_spi_transfer_one_setup(9), stm32_spi_can_poll(9), stm32_spi_transfer_one(9), stm32_spi_unprepare_msg(9), stm32fx_spi_config(9), stm32h7_spi_config(9)

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and that's the page, bestie 💖 this one lives over in ./drivers/spi and it's dated October 2026 — go off, spi driver era 🌸✨💜