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drivers/spi: stm32: fix TX-only mode

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When doing a TX-only SPI operation, the RX not empty flag will never get
set, thus this will just hang forever.

Found/tested on STM32L462 trying to drive some WS2812 RGB LEDs.

Signed-off-by: David Lamparter <equinox@diac24.net>
This commit is contained in:
David Lamparter 2023-06-09 00:21:09 +02:00 • committed by Fabio Baltieri
commit 31cd3b1f61
1 changed files with 4 additions and 2 deletions
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6
drivers/spi/spi_ll_stm32.c
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@ -324,8 +324,10 @@ static void spi_stm32_shift_m(SPI_TypeDef *spi, struct spi_stm32_data *data)
spi_context_update_tx(&data->ctx, 2, 1);
}
while (!ll_func_rx_is_not_empty(spi)) {
/* NOP */
if (spi_context_rx_buf_on(&data->ctx)) {
while (!ll_func_rx_is_not_empty(spi)) {
/* NOP */
}
}
if (SPI_WORD_SIZE_GET(data->ctx.config->operation) == 8) {