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arch/arm/src/stm32/lowputc: fix uart glitch when lowputc is enabled Calling up_lowputc() when a character is in the shift register results in corrupted character on stm32f1xx and stm32f205 cores. TC status bit ensures that up_lowputc() waits for an on-going transmission to complete before writing in TDR. Approved-by: Gregory Nutt <gnutt@nuttx.org> |
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