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Note the tradeoff behind the edge decoder baud cutoff

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J. Nick Koston
2026-08-19 15:15:54 -05:00
parent 8e27b2c717
commit 3c6dd27ad5
1 changed files with 4 additions and 1 deletions
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esphome/components/uart/uart_component_esp8266.cpp
+4 -1
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@@ -15,7 +15,10 @@
namespace esphome::uart {
static const char *const TAG = "uart";
// Edge decoder up to this baud rate, start bit sampler above it.
// Edge decoder up to this baud rate, start bit sampler above it. The cutoff is
// a deliberate tradeoff: the decoder tolerates ~0.25 bit of ISR latency jitter
// (~6.5us at 38400), too tight for higher rates where the sampler's whole byte
// ISR block is short anyway.
static constexpr uint32_t SW_SERIAL_EDGE_MODE_MAX_BAUD = 38400;
bool ESP8266UartComponent::serial0_in_use = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)