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drivers: uart_stm32: Add support for tx/rx swap

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Add a new boolean devicetree property `tx-rx-swap` to the
st,stm32-usart binding, used to control TX/RX swap during
device initialization.

Signed-off-by: Alexander Mihajlovic <a@abxy.se>
This commit is contained in:
Alexander Mihajlovic 2022-04-02 15:21:01 +02:00 • committed by Marti Bolivar
commit 4ff4991e16
3 changed files with 15 additions and 0 deletions
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7
drivers/serial/uart_stm32.c
View file

@ -473,6 +473,12 @@ static int uart_stm32_configure(const struct device *dev,
data->baud_rate = cfg->baudrate; data->baud_rate = cfg->baudrate;
} }
#ifdef LL_USART_TXRX_SWAPPED
if (config->tx_rx_swap) {
LL_USART_SetTXRXSwap(config->usart, LL_USART_TXRX_SWAPPED);
}
#endif
LL_USART_Enable(config->usart); LL_USART_Enable(config->usart);
return 0; return 0;
}; };
@ -1715,6 +1721,7 @@ static const struct uart_stm32_config uart_stm32_cfg_##index = { \
.parity = DT_INST_ENUM_IDX_OR(index, parity, UART_CFG_PARITY_NONE), \ .parity = DT_INST_ENUM_IDX_OR(index, parity, UART_CFG_PARITY_NONE), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(index), \ .pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(index), \
.single_wire = DT_INST_PROP_OR(index, single_wire, false), \ .single_wire = DT_INST_PROP_OR(index, single_wire, false), \
.tx_rx_swap = DT_INST_PROP_OR(index, tx_rx_swap, false), \
STM32_UART_IRQ_HANDLER_FUNC(index) \ STM32_UART_IRQ_HANDLER_FUNC(index) \
}; \ }; \
\ \

2
drivers/serial/uart_stm32.h
View file

@ -28,6 +28,8 @@ struct uart_stm32_config {
int parity; int parity;
/* switch to enable single wire / half duplex feature */ /* switch to enable single wire / half duplex feature */
bool single_wire; bool single_wire;
/* enable tx/rx pin swap */
bool tx_rx_swap;
const struct pinctrl_dev_config *pcfg; const struct pinctrl_dev_config *pcfg;
#if defined(CONFIG_UART_INTERRUPT_DRIVEN) || defined(CONFIG_UART_ASYNC_API) || \ #if defined(CONFIG_UART_INTERRUPT_DRIVEN) || defined(CONFIG_UART_ASYNC_API) || \
defined(CONFIG_PM) defined(CONFIG_PM)

6
dts/bindings/serial/st,stm32-usart.yaml
View file

@ -20,6 +20,12 @@ properties:
only TX pin is used afterwards and should be configured. only TX pin is used afterwards and should be configured.
RX/TX conflicts must be handled on user side. RX/TX conflicts must be handled on user side.
tx-rx-swap:
type: boolean
required: false
description: |
Swap the TX and RX pins. Used in case of a cross-wired connection.
pinctrl-0: pinctrl-0:
required: true required: true