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Merge branch 'logger_perf_8266' into integration

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J. Nick Koston
2026-01-18 20:38:49 -10:00
parent 72f71f59b3 bac836d2a7
commit 986caddb6c
1 changed files with 5 additions and 5 deletions
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10
esphome/components/logger/logger_esp8266.cpp
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@@ -3,11 +3,11 @@
#include "esphome/core/log.h"
// Direct UART register access for optimized write path
// Arduino's Serial.write() has significant overhead:
// - pgm_read_byte() for every character (unnecessary for RAM buffers)
// - optimistic_yield() after every character (massive scheduler overhead)
// - Per-character FIFO checks (could batch)
// Direct register writes with batching are 10-50x faster for CPU-side work.
// Arduino's Serial.write() (uart.cpp lines 545-548) has significant overhead:
// - PROGMEM read for every character (unnecessary for RAM buffers)
// - optimistic_yield(10000) after every character (scheduler overhead)
// - Per-character FIFO checks via uart_do_write_char() (line 513)
// Direct register writes with batching eliminate ~300 function calls per 100-byte message.
#include <esp8266_peri.h> // USF, USS, USTXC register macros
namespace esphome::logger {