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[uart] Wake main loop on ESP8266 software serial RX (#16562)

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This commit is contained in:
J. Nick Koston
2026-05-22 14:30:43 -05:00
committed by GitHub
parent 64e32ebe04
commit 7182b1a8ae
2 changed files with 19 additions and 5 deletions
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9
esphome/components/uart/__init__.py
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@@ -513,10 +513,11 @@ async def uart_write_to_code(config, action_id, template_arg, args):
@coroutine_with_priority(CoroPriority.FINAL)
async def final_step():
"""Final code generation step to configure optional UART features."""
if CORE.is_esp32 and CORE.has_networking:
# Wake-on-RX is essentially free on ESP32 (just an ISR function pointer
# registration) — enable by default to reduce RX buffer overflow risk
# by waking the main loop immediately when data arrives.
if (CORE.is_esp32 or CORE.is_esp8266) and CORE.has_networking:
# Wake-on-RX is essentially free (just an ISR function pointer
# registration on ESP32, an inline flag set on ESP8266 software
# serial) — enable by default to reduce RX buffer overflow risk by
# waking the main loop immediately when data arrives.
cg.add_define("USE_UART_WAKE_LOOP_ON_RX")

15
esphome/components/uart/uart_component_esp8266.cpp
View File

@@ -4,6 +4,9 @@
#include "esphome/core/defines.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
#ifdef USE_UART_WAKE_LOOP_ON_RX
#include "esphome/core/wake.h"
#endif
#ifdef USE_LOGGER
#include "esphome/components/logger/logger.h"
@@ -149,7 +152,11 @@ void ESP8266UartComponent::dump_config() {
if (this->hw_serial_ != nullptr) {
ESP_LOGCONFIG(TAG, " Using hardware serial interface.");
} else {
ESP_LOGCONFIG(TAG, " Using software serial");
ESP_LOGCONFIG(TAG, " Using software serial"
#ifdef USE_UART_WAKE_LOOP_ON_RX
"\n Wake on data RX: ENABLED"
#endif
);
}
this->check_logger_conflict();
}
@@ -266,6 +273,12 @@ void IRAM_ATTR ESP8266SoftwareSerial::gpio_intr(ESP8266SoftwareSerial *arg) {
arg->rx_in_pos_ = (arg->rx_in_pos_ + 1) % arg->rx_buffer_size_;
// Clear RX pin so that the interrupt doesn't re-trigger right away again.
arg->rx_pin_.clear_interrupt();
#ifdef USE_UART_WAKE_LOOP_ON_RX
// Wake the main loop so the consuming component drains the byte promptly
// instead of waiting for the next loop_interval_ tick. Important for timing
// sensitive setups that poll read() in a tight loop (e.g. fingerprint_grow).
wake_loop_isrsafe();
#endif
}
void IRAM_ATTR HOT ESP8266SoftwareSerial::write_byte(uint8_t data) {
if (this->gpio_tx_pin_ == nullptr) {