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Driver: Add pin inversion to Esp32 Uart

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Additional properties are added to esp32 uart to allow
for signal inversion.

Signed-off-by: Ayush Kothari <ayush@croxel.com>
This commit is contained in:
Ayush Kothari 2024-05-10 21:00:06 +05:30 • committed by Anas Nashif
commit 13dfd86616
2 changed files with 23 additions and 0 deletions
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11
drivers/serial/uart_esp32.c
View file

@ -67,6 +67,8 @@ struct uart_esp32_config {
const clock_control_subsys_t clock_subsys;
int irq_source;
int irq_priority;
bool tx_invert;
bool rx_invert;
#if CONFIG_UART_ASYNC_API
const struct device *dma_dev;
uint8_t tx_dma_channel;
@ -328,6 +330,13 @@ static int uart_esp32_configure(const struct device *dev, const struct uart_conf
uart_hal_set_rx_timeout(&data->hal, 0x16);
if (config->tx_invert) {
uart_hal_inverse_signal(&data->hal, UART_SIGNAL_TXD_INV);
}
if (config->rx_invert) {
uart_hal_inverse_signal(&data->hal, UART_SIGNAL_RXD_INV);
}
return 0;
}
@ -1004,6 +1013,8 @@ static const DRAM_ATTR struct uart_driver_api uart_esp32_api = {
.clock_subsys = (clock_control_subsys_t)DT_INST_CLOCKS_CELL(idx, offset), \
.irq_source = DT_INST_IRQN(idx), \
.irq_priority = UART_IRQ_PRIORITY, \
.tx_invert = DT_INST_PROP_OR(idx, tx_invert, false), \
.rx_invert = DT_INST_PROP_OR(idx, rx_invert, false), \
ESP_UART_DMA_INIT(idx)}; \
\
static struct uart_esp32_data uart_esp32_data_##idx = { \

12
dts/bindings/serial/espressif,esp32-uart.yaml
View file

@ -21,3 +21,15 @@ properties:
Overrides hw-flow-control if both are set.
Using this mode, the pin assigned to DTR
is asserted during transmission.
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.