michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: serial: stm32 uart implements driver enable

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

21
drivers/serial/uart_stm32.c
View file

@ -1705,6 +1705,23 @@ static int uart_stm32_init(const struct device *dev)
}
#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);
#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), \
.rx_invert = DT_INST_PROP(index, rx_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_PM_WAKEUP(index) \
}; \

8
drivers/serial/uart_stm32.h
View file

@ -36,6 +36,14 @@ struct uart_stm32_config {
bool rx_invert;
/* enable tx pin inversion */
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;
#if defined(CONFIG_UART_INTERRUPT_DRIVEN) || defined(CONFIG_UART_ASYNC_API) || \
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
the core from stop mode(s).
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.