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[uart] Always call pin setup for UART0 default pins on ESP-IDF (#14130)

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This commit is contained in:
J. Nick Koston
2026-02-19 17:48:18 -06:00
committed by Jonathan Swoboda
parent f412ab4f8b
commit 7bdeb32a8a
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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@@ -19,6 +19,13 @@ namespace esphome::uart {
static const char *const TAG = "uart.idf";
/// Check if a pin number matches one of the default UART0 GPIO pins.
/// These pins may have residual state from the boot console that requires
/// explicit reset before UART reconfiguration (ESP-IDF issue #17459).
static constexpr bool is_default_uart0_pin(int8_t pin_num) {
return pin_num == U0TXD_GPIO_NUM || pin_num == U0RXD_GPIO_NUM;
}
uart_config_t IDFUARTComponent::get_config_() {
uart_parity_t parity = UART_PARITY_DISABLE;
if (this->parity_ == UART_CONFIG_PARITY_EVEN) {
@@ -150,20 +157,26 @@ void IDFUARTComponent::load_settings(bool dump_config) {
// 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) {
if (is_default_uart0_pin(tx)) {
gpio_reset_pin(static_cast<gpio_num_t>(tx));
}
if (rx == U0TXD_GPIO_NUM || rx == U0RXD_GPIO_NUM) {
if (is_default_uart0_pin(rx)) {
gpio_reset_pin(static_cast<gpio_num_t>(rx));
}
// Setup pins after reset to preserve open drain/pullup/pulldown flags
// Setup pins after reset to configure GPIO direction and pull resistors.
// For UART0 default pins, setup() must always be called because gpio_reset_pin()
// above sets GPIO_MODE_DISABLE which disables the input buffer. Without setup(),
// uart_set_pin() on ESP-IDF 5.4.2+ does not re-enable the input buffer for
// IOMUX-connected pins, so the RX pin cannot receive data (see issue #10132).
// For other pins, only call setup() if pull or open-drain flags are set to avoid
// disturbing the default pin state which breaks some external components (#11823).
auto setup_pin_if_needed = [](InternalGPIOPin *pin) {
if (!pin) {
return;
}
const auto mask = gpio::Flags::FLAG_OPEN_DRAIN | gpio::Flags::FLAG_PULLUP | gpio::Flags::FLAG_PULLDOWN;
if ((pin->get_flags() & mask) != gpio::Flags::FLAG_NONE) {
if (is_default_uart0_pin(pin->get_pin()) || (pin->get_flags() & mask) != gpio::Flags::FLAG_NONE) {
pin->setup();
}
};