Marian Buschsieweke
b2199bb744
cpu/stm32: Fix periph_spi operation in non-DMA mode ...
The driver previously failed to reliably clear the RXNE bit, resulting
in the next transfer to incorrectly read a stale register value. This
was noticed with the SD card SPI driver on an STM32F4, in which the
0xff byte of the previous byte transfer was returned instead of the
actual status byte, throwing the SD card driver off the rails.
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b2199bb744