c1a173a884
This change adds additional workaround for following errata: "USART does not generate DMA requests after setting/clearing DMAT bit" Instead of keepint DMAT bit set, it sends first byte by polling in firmware. This prevents additional power consumption in STOP mode, caused by keeping DMAT bit set. Signed-off-by: Adam Berlinger <adam.berlinger@st.com>
58 lines
1.7 KiB
Text
58 lines
1.7 KiB
Text
# STM32 UART configuration
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# Copyright (c) 2016 Open-RnD Sp. z o.o.
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# SPDX-License-Identifier: Apache-2.0
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config UART_STM32
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bool "STM32 MCU serial driver"
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default y
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depends on DT_HAS_ST_STM32_UART_ENABLED
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select SERIAL_HAS_DRIVER
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select SERIAL_SUPPORT_INTERRUPT
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# the ASYNC implementation requires a DMA controller
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select SERIAL_SUPPORT_ASYNC \
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if DT_HAS_ST_STM32_DMA_V1_ENABLED || \
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DT_HAS_ST_STM32_DMA_V2_ENABLED || \
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DT_HAS_ST_STM32_DMA_V2BIS_ENABLED || \
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DT_HAS_ST_STM32U5_DMA_ENABLED
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select DMA if UART_ASYNC_API
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select RESET
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select PINCTRL
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help
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This option enables the UART driver for STM32 family of
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processors.
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Say y if you wish to use serial port on STM32 MCU.
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if UART_STM32
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if SOC_STM32U575XX || SOC_STM32U585XX || \
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SOC_STM32H562XX || SOC_STM32H563XX || SOC_STM32H573XX
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choice UART_STM32U5_ERRATA_DMAT
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prompt "Workaround for DMAT errata on selected devices"
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default UART_STM32U5_ERRATA_DMAT_LOWPOWER if PM
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default UART_STM32U5_ERRATA_DMAT_NOCLEAR if !PM
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help
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Handles erratum "USART does not generate DMA requests after
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setting/clearing DMAT bit".
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Seen in Errata Sheet 0499 § 2.19.2 and §2.20.1 for stm32u57x/u58x,
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Errata Sheet 0565 § 2.14.1 and §2.15.1 for stm32h56x/h57x
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config UART_STM32U5_ERRATA_DMAT_LOWPOWER
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bool "Send first byte by polling"
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help
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This option sends first byte via software polling and
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rest of the buffer is sent via DMA. This option is suitable
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for STOP low-power modes.
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config UART_STM32U5_ERRATA_DMAT_NOCLEAR
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bool "Do not clear DMAT"
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help
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This option keeps DMAT bit set. This may cause additional power
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consumption in STOP low-power modes.
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endchoice
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endif # U575 || U585 || H562 || H563 || H573
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endif # UART_STM32
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