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[core] Add progmem_memcpy HAL helper (#16470)

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This commit is contained in:
J. Nick Koston
2026-05-19 10:13:58 -07:00
committed by GitHub
parent 1d0ddfac5d
commit 80ed541032
2 changed files with 11 additions and 1 deletions
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6
esphome/components/esp8266/hal.h
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@@ -58,6 +58,12 @@ __attribute__((always_inline)) inline const char *progmem_read_ptr(const char *c
__attribute__((always_inline)) inline uint16_t progmem_read_uint16(const uint16_t *addr) {
return pgm_read_word(addr); // NOLINT
}
// Bulk PROGMEM copy: routes to the SDK's aligned-flash `memcpy_P` so callers
// don't have to drop to a byte-by-byte `progmem_read_byte` loop, which on
// ESP8266 is ~4x as many flash accesses as the bulk path.
__attribute__((always_inline)) inline void progmem_memcpy(void *dst, const void *src, size_t len) {
memcpy_P(dst, src, len); // NOLINT
}
// NOLINTNEXTLINE(readability-identifier-naming)
__attribute__((always_inline)) inline void delayMicroseconds(uint32_t us) { delay_microseconds_safe(us); }

6
esphome/core/hal.h
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@@ -1,6 +1,7 @@
#pragma once
#include <string>
#include <cstdint>
#include <cstring>
#include <string>
#include "gpio.h"
#include "esphome/core/defines.h"
#include "esphome/core/time_64.h"
@@ -42,6 +43,9 @@ void __attribute__((noreturn)) arch_restart();
inline uint8_t progmem_read_byte(const uint8_t *addr) { return *addr; }
inline const char *progmem_read_ptr(const char *const *addr) { return *addr; }
inline uint16_t progmem_read_uint16(const uint16_t *addr) { return *addr; }
// Bulk copy out of PROGMEM. PROGMEM is a no-op everywhere except ESP8266, so a
// plain `std::memcpy` is correct and the fast path here.
inline void progmem_memcpy(void *dst, const void *src, size_t len) { std::memcpy(dst, src, len); }
#endif
} // namespace esphome