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Increase max backtrace to 8 entries for deep ESP8266 stacks

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ESP8266 call stacks are typically deep due to Arduino/LWIP/WiFi
layers. 8 entries (36 bytes, 9 RTC blocks) better captures the
WiFi -> LWIP -> socket -> ESPHome -> component call chain.
This commit is contained in:
J. Nick Koston
2026-04-05 11:54:01 -10:00
parent 8dc30bc54d
commit 0d93f2fcd1
1 changed files with 6 additions and 6 deletions
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esphome/components/esp8266/crash_handler.cpp
+6 -6
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@@ -36,9 +36,9 @@ static inline uint32_t IRAM_ATTR recover_code_addr(uint32_t val) { return (val &
// RTC user memory layout for crash backtrace data.
// User-accessible RTC memory: blocks 64-191 (each block = 4 bytes).
// We use blocks 187-191 (last 5 blocks, 20 bytes) to minimize conflicts.
static constexpr uint8_t RTC_CRASH_BASE = 187;
static constexpr size_t MAX_BACKTRACE = 4;
// We use blocks 183-191 (last 9 blocks, 36 bytes) to minimize conflicts.
static constexpr uint8_t RTC_CRASH_BASE = 183;
static constexpr size_t MAX_BACKTRACE = 8;
// Magic word packs sentinel, version, and count into one uint32_t:
// bits[31:16] = 0xDEAD (sentinel)
@@ -50,14 +50,14 @@ static constexpr uint32_t CRASH_SENTINEL_MASK = 0xFFFF0000;
static constexpr uint32_t CRASH_VERSION_MASK = 0x0000FF00;
static constexpr uint32_t CRASH_COUNT_MASK = 0x000000FF;
// Struct layout: 5 RTC blocks (20 bytes):
// Struct layout: 9 RTC blocks (36 bytes):
// [0] = magic (sentinel | version | count)
// [1..4] = up to 4 code addresses from stack scanning
// [1..8] = up to 8 code addresses from stack scanning
struct RtcCrashData {
uint32_t magic;
uint32_t backtrace[MAX_BACKTRACE];
};
static_assert(sizeof(RtcCrashData) == 20, "RtcCrashData must fit in 5 RTC blocks");
static_assert(sizeof(RtcCrashData) == 36, "RtcCrashData must fit in 9 RTC blocks");
namespace esphome::esp8266 {