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drivers: serial: stm32 uart implements driver enable

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Enables the use of the hardware DE pin provided by an stm32 UART using
device tree flags.

Signed-off-by: Abram Early <abram.early@gmail.com>
This commit is contained in:
Abram Early 2023-05-03 10:10:21 -06:00 • committed by Anas Nashif
commit a59c948256
3 changed files with 57 additions and 0 deletions
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21
drivers/serial/uart_stm32.c
View file

@ -1705,6 +1705,23 @@ static int uart_stm32_init(const struct device *dev)
} }
#endif #endif
#ifdef USART_CR3_DEM
if (config->de_enable) {
if (!IS_UART_DRIVER_ENABLE_INSTANCE(config->usart)) {
LOG_ERR("%s does not support driver enable", dev->name);
return -EINVAL;
}
LL_USART_EnableDEMode(config->usart);
LL_USART_SetDEAssertionTime(config->usart, config->de_assert_time);
LL_USART_SetDEDeassertionTime(config->usart, config->de_deassert_time);
if (config->de_invert) {
LL_USART_SetDESignalPolarity(config->usart, LL_USART_DE_POLARITY_LOW);
}
}
#endif
LL_USART_Enable(config->usart); LL_USART_Enable(config->usart);
#ifdef USART_ISR_TEACK #ifdef USART_ISR_TEACK
@ -1918,6 +1935,10 @@ static const struct uart_stm32_config uart_stm32_cfg_##index = { \
.tx_rx_swap = DT_INST_PROP_OR(index, tx_rx_swap, false), \ .tx_rx_swap = DT_INST_PROP_OR(index, tx_rx_swap, false), \
.rx_invert = DT_INST_PROP(index, rx_invert), \ .rx_invert = DT_INST_PROP(index, rx_invert), \
.tx_invert = DT_INST_PROP(index, tx_invert), \ .tx_invert = DT_INST_PROP(index, tx_invert), \
.de_enable = DT_INST_PROP(index, de_enable), \
.de_assert_time = DT_INST_PROP(index, de_assert_time), \
.de_deassert_time = DT_INST_PROP(index, de_deassert_time), \
.de_invert = DT_INST_PROP(index, de_invert), \
STM32_UART_IRQ_HANDLER_FUNC(index) \ STM32_UART_IRQ_HANDLER_FUNC(index) \
STM32_UART_PM_WAKEUP(index) \ STM32_UART_PM_WAKEUP(index) \
}; \ }; \

8
drivers/serial/uart_stm32.h
View file

@ -36,6 +36,14 @@ struct uart_stm32_config {
bool rx_invert; bool rx_invert;
/* enable tx pin inversion */ /* enable tx pin inversion */
bool tx_invert; bool tx_invert;
/* enable de signal */
bool de_enable;
/* de signal assertion time in 1/16 of a bit */
uint8_t de_assert_time;
/* de signal deassertion time in 1/16 of a bit */
uint8_t de_deassert_time;
/* enable de pin inversion */
bool de_invert;
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)

28
dts/bindings/serial/st,stm32-uart-base.yaml
View file

@ -58,3 +58,31 @@ properties:
configured masked at boot (sm32wl55 for instance), preventing the device to wakeup configured masked at boot (sm32wl55 for instance), preventing the device to wakeup
the core from stop mode(s). the core from stop mode(s).
Valid range: 0 - 31 Valid range: 0 - 31
de-enable:
type: boolean
description: |
Enable activating an external transeiver through the DE pin which must also be configured
using pinctrl.
de-assert-time:
type: int
default: 0
description: |
Defines the time between the activation of the DE signal and the beginning of the start bit.
It is expressed in 16th of a bit time.
Valid range: 0 - 31
de-deassert-time:
type: int
default: 0
description: |
Defines the time between the activation of the DE signal and the beginning of the start bit.
It is expressed in 16th of a bit time.
Valid range: 0 - 31
de-invert:
type: boolean
description: |
Invert the binary logic of the de pin. When enabled, physical logic levels are inverted and
we use 1=Low, 0=High instead of 1=High, 0=Low.