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stm32/uart: Enable UART FIFO for STM32N6. #18067

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Merged
merged 1 commit into from
Sep 18, 2025
Merged

stm32/uart: Enable UART FIFO for STM32N6. #18067

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2 changes: 1 addition & 1 deletion ports/stm32/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -445,7 +445,7 @@ HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/stm32$(MCU_SERIES)xx_,\
)
endif

ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),h7))
ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),h7 n6))
HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/stm32$(MCU_SERIES)xx_,\
hal_uart_ex.c \
)
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8 changes: 4 additions & 4 deletions ports/stm32/uart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -665,7 +665,7 @@ bool uart_init(machine_uart_obj_t *uart_obj,
huart.Init.HwFlowCtl = flow;
huart.Init.OverSampling = UART_OVERSAMPLING_16;

#if defined(STM32G4) || defined(STM32H7) // WB also has a fifo..
#if defined(STM32G4) || defined(STM32H7) || defined(STM32N6) // WB also has a fifo..
huart.FifoMode = UART_FIFOMODE_ENABLE;
#endif

Expand Down Expand Up @@ -717,7 +717,7 @@ bool uart_init(machine_uart_obj_t *uart_obj,
uart_obj->char_width = CHAR_WIDTH_8BIT;
}

#if defined(STM32H7)
#if defined(STM32H7) || defined(STM32N6)
HAL_UARTEx_SetTxFifoThreshold(&huart, UART_TXFIFO_THRESHOLD_1_8);
HAL_UARTEx_SetRxFifoThreshold(&huart, UART_RXFIFO_THRESHOLD_1_8);
HAL_UARTEx_EnableFifoMode(&huart);
Expand Down Expand Up @@ -1186,8 +1186,8 @@ size_t uart_tx_data(machine_uart_obj_t *self, const void *src_in, size_t num_cha
// timeout_char by FIFO size + 1.
// STM32G4 has 8 words FIFO.
timeout = (8 + 1) * self->timeout_char;
#elif defined(STM32H7)
// STM32H7 has 16 words FIFO.
#elif defined(STM32H7) || defined(STM32N6)
// STM32H7 and STM32N6 have 16 words FIFO.
timeout = (16 + 1) * self->timeout_char;
#else
// The timeout specified here is for waiting for the TX data register to
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