diff options
| -rw-r--r-- | src/stm32f4/serial.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/stm32f4/serial.c b/src/stm32f4/serial.c index 951a8297..525e4493 100644 --- a/src/stm32f4/serial.c +++ b/src/stm32f4/serial.c @@ -21,8 +21,9 @@ serial_init(void) enable_pclock(USART2_BASE); uint32_t pclk = get_pclock_frequency(USART2_BASE); - uint32_t div = pclk / (CONFIG_SERIAL_BAUD * 16); - USART2->BRR = div << USART_BRR_DIV_Mantissa_Pos; + uint32_t div = DIV_ROUND_CLOSEST(pclk, CONFIG_SERIAL_BAUD); + USART2->BRR = (((div / 16) << USART_BRR_DIV_Mantissa_Pos) + | ((div % 16) << USART_BRR_DIV_Fraction_Pos)); USART2->CR1 = CR1_FLAGS; NVIC_SetPriority(USART2_IRQn, 0); NVIC_EnableIRQ(USART2_IRQn); |