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[uart] Delete ESP32 UART driver on shutdown to keep ROM output off the bus (#18684)

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Co-authored-by: J. Nick Koston <nick@home-assistant.io>
This commit is contained in:
Gafielt
2026-08-24 11:36:23 -05:00
committed by GitHub
co-authored by J. Nick Koston
parent b11a34af5c
commit b8408e14b9
2 changed files with 14 additions and 1 deletions
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esphome/components/uart/uart_component_esp_idf.cpp
+11
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@@ -393,5 +393,16 @@ void IRAM_ATTR IDFUARTComponent::uart_rx_isr_callback(uart_port_t uart_num, uart
}
#endif // USE_UART_WAKE_LOOP_ON_RX
void IDFUARTComponent::on_shutdown() {
if (this->uart_num_ == UART_NUM_MAX || !uart_is_driver_installed(this->uart_num_))
return;
uart_wait_tx_done(this->uart_num_, pdMS_TO_TICKS(100));
// Keep the peripheral quiet across a soft reset so ROM output does not reach the attached device (#15472)
esp_err_t err = uart_driver_delete(this->uart_num_);
if (err != ESP_OK) {
ESP_LOGW(TAG, "uart_driver_delete failed: %s", esp_err_to_name(err));
}
}
} // namespace esphome::uart
#endif // USE_ESP32
esphome/components/uart/uart_component_esp_idf.h
+3 -1
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@@ -52,9 +52,11 @@ class IDFUARTComponent final : public UARTComponent, public Component {
void load_settings(bool dump_config) override;
using UARTComponent::load_settings; // also bring in the no-arg overload for convenience
void on_shutdown() override;
protected:
void check_logger_conflict() override;
uart_port_t uart_num_;
uart_port_t uart_num_{UART_NUM_MAX};
uart_config_t get_config_();
bool has_peek_{false};