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[core] Use constexpr for compile-time constants (#14071)

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This commit is contained in:
J. Nick Koston
2026-02-19 03:19:48 +00:00
committed by GitHub
parent 20239d1bb3
commit dff9780d3a
3 changed files with 5 additions and 5 deletions
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esphome/core/helpers.cpp
+3 -3
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@@ -846,9 +846,9 @@ void IRAM_ATTR HOT delay_microseconds_safe(uint32_t us) {
// avoids CPU locks that could trigger WDT or affect WiFi/BT stability
uint32_t start = micros();
const uint32_t lag = 5000; // microseconds, specifies the maximum time for a CPU busy-loop.
// it must be larger than the worst-case duration of a delay(1) call (hardware tasks)
// 5ms is conservative, it could be reduced when exact BT/WiFi stack delays are known
constexpr uint32_t lag = 5000; // microseconds, specifies the maximum time for a CPU busy-loop.
// it must be larger than the worst-case duration of a delay(1) call (hardware tasks)
// 5ms is conservative, it could be reduced when exact BT/WiFi stack delays are known
if (us > lag) {
delay((us - lag) / 1000UL); // note: in disabled-interrupt contexts delay() won't actually sleep
while (micros() - start < us - lag)