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Avoid losing input bytes in the UART on STM32F4xx.#8

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reznikmm wants to merge 1 commit intoGNAT-Academic-Program:mainfrom
reznikmm:topic/stm32_uart
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Avoid losing input bytes in the UART on STM32F4xx.#8
reznikmm wants to merge 1 commit intoGNAT-Academic-Program:mainfrom
reznikmm:topic/stm32_uart

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The compiler expands an assignment to part of the DR register to a read-modify-write sequence. However, reading DR has the side-effect of clearing the SR.RXNE bit, so sending a byte could result in the loss of input bytes.

The compiler expands an assignment to part of the DR register
to a read-modify-write sequence. However, reading DR has
the side-effect of clearing the SR.RXNE bit, so sending
a byte could result in the loss of input bytes.
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