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drivers: serial: mcux lpuart add (tx/rx)invert and single wire

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Adds device tree definitions to enable tx/rx invert and singlewire modes

Signed-off-by: Peter van der Perk <peter.vanderperk@nxp.com>
This commit is contained in:
Peter van der Perk 2024-04-12 13:37:58 +02:00 • committed by Anas Nashif
commit 7adc4b689b
2 changed files with 51 additions and 0 deletions
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31
drivers/serial/uart_mcux_lpuart.c
View file

@ -58,6 +58,9 @@ struct mcux_lpuart_config {
uint8_t parity;
bool rs485_de_active_low;
bool loopback_en;
bool single_wire;
bool tx_invert;
bool rx_invert;
#ifdef CONFIG_UART_MCUX_LPUART_ISR_SUPPORT
void (*irq_config_func)(const struct device *dev);
#endif
@ -1105,8 +1108,30 @@ static int mcux_lpuart_configure_init(const struct device *dev, const struct uar
/* Set the LPUART into loopback mode */
config->base->CTRL |= LPUART_CTRL_LOOPS_MASK;
config->base->CTRL &= ~LPUART_CTRL_RSRC_MASK;
} else if (config->single_wire) {
/* Enable the single wire / half-duplex mode, only possible when
* loopback is disabled. We need a critical section to prevent
* the UART firing an interrupt during mode switch
*/
unsigned int key = irq_lock();
config->base->CTRL |= (LPUART_CTRL_LOOPS_MASK | LPUART_CTRL_RSRC_MASK);
irq_unlock(key);
} else {
#ifdef LPUART_CTRL_TXINV
/* Only invert TX in full-duplex mode */
if (config->tx_invert) {
config->base->CTRL |= LPUART_CTRL_TXINV(1);
}
#endif
}
#ifdef LPUART_STAT_RXINV
if (config->rx_invert) {
config->base->STAT |= LPUART_STAT_RXINV(1);
}
#endif
/* update internal uart_config */
data->uart_config = *cfg;
@ -1126,6 +1151,9 @@ static int mcux_lpuart_configure(const struct device *dev,
{
const struct mcux_lpuart_config *config = dev->config;
/* Make sure that RSRC is de-asserted otherwise deinit will hang. */
config->base->CTRL &= ~LPUART_CTRL_RSRC_MASK;
/* disable LPUART */
LPUART_Deinit(config->base);
@ -1330,6 +1358,9 @@ static const struct mcux_lpuart_config mcux_lpuart_##n##_config = { \
.parity = DT_INST_ENUM_IDX_OR(n, parity, UART_CFG_PARITY_NONE), \
.rs485_de_active_low = DT_INST_PROP(n, nxp_rs485_de_active_low), \
.loopback_en = DT_INST_PROP(n, nxp_loopback), \
.single_wire = DT_INST_PROP(n, single_wire), \
.rx_invert = DT_INST_PROP(n, rx_invert), \
.tx_invert = DT_INST_PROP(n, tx_invert), \
.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
MCUX_LPUART_IRQ_INIT(n) \
RX_DMA_CONFIG(n) \

20
dts/bindings/serial/nxp,kinetis-lpuart.yaml
View file

@ -15,6 +15,26 @@ properties:
disconnected, and transmitter output is internally connected to
the receiver input.
single-wire:
type: boolean
description: |
Enable the single wire half-duplex communication.
Using this mode, TX and RX lines are internally connected and
only TX pin is used afterwards and should be configured.
RX/TX conflicts must be handled on user side.
tx-invert:
type: boolean
description: |
Invert the binary logic of tx pin. When enabled, physical logic levels are inverted and
we use 1=Low, 0=High instead of 1=High, 0=Low.
rx-invert:
type: boolean
description: |
Invert the binary logic of rx pin. When enabled, physical logic levels are inverted and
we use 1=Low, 0=High instead of 1=High, 0=Low.
nxp,rs485-mode:
type: boolean
description: |