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drivers: spi: stm32: dynamically update spi word/frame size

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Update the source_data and dest_data sizes with the frame size
in bytes before performing the transfer.
With these changes, we can handle cases where the buffers switch
between 8-bit and 16-bit modes.

Signed-off-by: Fabrice DJIATSA <fabrice.djiatsa-ext@st.com>
This commit is contained in:
Fabrice DJIATSA 2025-06-13 10:10:12 +02:00 • committed by Daniel DeGrasse
commit eccf541ea6
1 changed files with 7 additions and 0 deletions
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7
drivers/spi/spi_ll_stm32.c
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@ -1186,6 +1186,13 @@ static int transceive_dma(const struct device *dev,
/* This is turned off in spi_stm32_complete(). */
spi_stm32_cs_control(dev, true);
uint8_t word_size_bytes = bits2bytes(SPI_WORD_SIZE_GET(config->operation));
data->dma_rx.dma_cfg.source_data_size = word_size_bytes;
data->dma_rx.dma_cfg.dest_data_size = word_size_bytes;
data->dma_tx.dma_cfg.source_data_size = word_size_bytes;
data->dma_tx.dma_cfg.dest_data_size = word_size_bytes;
while (data->ctx.rx_len > 0 || data->ctx.tx_len > 0) {
size_t dma_len;