968878a62d
Co-authored-by: J. Nick Koston <nick@home-assistant.io> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
#include "esphome/core/defines.h"
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#ifdef USE_ZEPHYR
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#include "esphome/core/hal.h"
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#include "esphome/core/wake.h"
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#include <zephyr/kernel.h>
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namespace esphome {
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// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
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K_SEM_DEFINE(esphome_wake_sem, 0, 1);
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// === Wake-requested flag storage ===
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// Zephyr has preemptive threads and ISRs, so wake_loop_threadsafe() is genuinely
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// called cross-context. volatile uint8_t is sufficient because: (1) Cortex-M
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// 8-bit aligned store/load is a single non-tearing instruction, and (2) every
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// producer pairs the store with k_sem_give() (release barrier) and the consumer
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// pairs the load with k_sem_take() (acquire barrier).
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// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
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volatile uint8_t g_wake_requested = 0;
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void wake_loop_threadsafe() {
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wake_request_set();
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k_sem_give(&esphome_wake_sem);
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}
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namespace internal {
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void wakeable_delay(uint32_t ms) {
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if (ms == 0) [[unlikely]] {
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yield();
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return;
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}
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k_sem_take(&esphome_wake_sem, ms == UINT32_MAX ? K_FOREVER : K_MSEC(ms));
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}
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} // namespace internal
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} // namespace esphome
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#endif // USE_ZEPHYR
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