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[uart] Fix UART on default UART0 pins for ESP-IDF (#12519)

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Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Jonathan Swoboda
2025-12-16 10:17:17 -05:00
parent 7216120bfd
commit 4d6a93f92d
1 changed files with 17 additions and 4 deletions
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21
esphome/components/uart/uart_component_esp_idf.cpp
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@@ -9,6 +9,7 @@
#include "esphome/core/gpio.h"
#include "driver/gpio.h"
#include "soc/gpio_num.h"
#include "soc/uart_pins.h"
#ifdef USE_LOGGER
#include "esphome/components/logger/logger.h"
@@ -139,6 +140,22 @@ void IDFUARTComponent::load_settings(bool dump_config) {
return;
}
int8_t tx = this->tx_pin_ != nullptr ? this->tx_pin_->get_pin() : -1;
int8_t rx = this->rx_pin_ != nullptr ? this->rx_pin_->get_pin() : -1;
int8_t flow_control = this->flow_control_pin_ != nullptr ? this->flow_control_pin_->get_pin() : -1;
// Workaround for ESP-IDF issue: https://github.com/espressif/esp-idf/issues/17459
// Commit 9ed617fb17 removed gpio_func_sel() calls from uart_set_pin(), which breaks
// UART on default UART0 pins that may have residual state from boot console.
// Reset these pins before configuring UART to ensure they're in a clean state.
if (tx == U0TXD_GPIO_NUM || tx == U0RXD_GPIO_NUM) {
gpio_reset_pin(static_cast<gpio_num_t>(tx));
}
if (rx == U0TXD_GPIO_NUM || rx == U0RXD_GPIO_NUM) {
gpio_reset_pin(static_cast<gpio_num_t>(rx));
}
// Setup pins after reset to preserve open drain/pullup/pulldown flags
auto setup_pin_if_needed = [](InternalGPIOPin *pin) {
if (!pin) {
return;
@@ -154,10 +171,6 @@ void IDFUARTComponent::load_settings(bool dump_config) {
setup_pin_if_needed(this->tx_pin_);
}
int8_t tx = this->tx_pin_ != nullptr ? this->tx_pin_->get_pin() : -1;
int8_t rx = this->rx_pin_ != nullptr ? this->rx_pin_->get_pin() : -1;
int8_t flow_control = this->flow_control_pin_ != nullptr ? this->flow_control_pin_->get_pin() : -1;
uint32_t invert = 0;
if (this->tx_pin_ != nullptr && this->tx_pin_->is_inverted()) {
invert |= UART_SIGNAL_TXD_INV;