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STM32: USARTv1: improve baud rate calculation accuracity

This commit is contained in:
Andrey Gusakov 2024-06-17 13:52:40 +03:00
parent a173d119f1
commit adeb3c34cf
1 changed files with 2 additions and 2 deletions
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4
os/hal/ports/STM32/LLD/USARTv1/hal_serial_lld.c
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@ -108,9 +108,9 @@ static void usart_init(SerialDriver *sdp, const SerialConfig *config) {
#else #else
if (sdp->usart == USART1) if (sdp->usart == USART1)
#endif #endif
fck = STM32_PCLK2 / config->speed; fck = (STM32_PCLK2 + config->speed / 2) / config->speed;
else else
fck = STM32_PCLK1 / config->speed; fck = (STM32_PCLK1 + config->speed / 2) / config->speed;
/* Correcting USARTDIV when oversampling by 8 instead of 16. /* Correcting USARTDIV when oversampling by 8 instead of 16.
Fraction is still 4 bits wide, but only lower 3 bits used. Fraction is still 4 bits wide, but only lower 3 bits used.