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Derive magic word masks from bit positions at compile time

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This commit is contained in:
J. Nick Koston
2026-04-05 12:07:30 -10:00
parent 5aac3e1317
commit c1c45cfd23
1 changed files with 13 additions and 7 deletions
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esphome/components/esp8266/crash_handler.cpp
+13 -7
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@@ -84,14 +84,20 @@ static constexpr uint8_t RTC_CRASH_BASE = 174;
static constexpr size_t MAX_BACKTRACE = 16;
// Magic word packs sentinel, version, and count into one uint32_t:
// bits[31:16] = 0xDEAD (sentinel)
// bits[15:8] = version (1)
// bits[31:16] = sentinel
// bits[15:8] = version
// bits[7:0] = backtrace count
static constexpr uint32_t CRASH_SENTINEL = 0xDEAD0000;
static constexpr uint32_t CRASH_VERSION = 0x00000100; // version 1 in bits[15:8]
static constexpr uint32_t CRASH_SENTINEL_MASK = 0xFFFF0000;
static constexpr uint32_t CRASH_VERSION_MASK = 0x0000FF00;
static constexpr uint32_t CRASH_COUNT_MASK = 0x000000FF;
static constexpr uint8_t CRASH_SENTINEL_BITS = 16;
static constexpr uint8_t CRASH_VERSION_BITS = 8;
static constexpr uint16_t CRASH_SENTINEL_VALUE = 0xDEAD;
static constexpr uint8_t CRASH_VERSION_VALUE = 1;
static constexpr uint32_t CRASH_SENTINEL = static_cast<uint32_t>(CRASH_SENTINEL_VALUE) << CRASH_SENTINEL_BITS;
static constexpr uint32_t CRASH_VERSION = static_cast<uint32_t>(CRASH_VERSION_VALUE) << CRASH_VERSION_BITS;
static constexpr uint32_t CRASH_SENTINEL_MASK = static_cast<uint32_t>(0xFFFF) << CRASH_SENTINEL_BITS;
static constexpr uint32_t CRASH_VERSION_MASK = static_cast<uint32_t>(0xFF) << CRASH_VERSION_BITS;
static constexpr uint32_t CRASH_COUNT_MASK = 0xFF;
// Struct layout: 18 RTC blocks (72 bytes):
// [0] = magic (sentinel | version | count)