Increase MAX_PACKET_SIZE from 128 to 300 for BNO085 SPI #1

New Issue

MrUnknownDE · 2026-04-05T17:51:34+02:00

MrUnknownDE commented

2026-04-05 17:51:34 +02:00

Originally created by @halfsohappy on 3/25/2026

Summary

BNO085 can return packets up to 270 bytes during sensor hub initialisation
MAX_PACKET_SIZE 128 sized shtpData[] at only 128 bytes, so the SPI receive loop wrote up to 270 bytes into it
This corrupted the adjacent heap and triggered multi_heap_poisoning asserts on ESP32-S3 at boot (CORRUPT HEAP panic at 0x3fcb1dbc)
Increase to 300 (safely above the 270-byte maximum) so the buffer is never overflowed

Test plan

Flash ab7 board (ESP32-S3, BNO085 on SPI) and confirm no CORRUPT HEAP panic at boot
Verify BNO085 quaternion data flows normally after init

🤖 Generated with Claude Code

*Originally created by @halfsohappy on 3/25/2026* ## Summary - BNO085 can return packets up to 270 bytes during sensor hub initialisation - `MAX_PACKET_SIZE 128` sized `shtpData[]` at only 128 bytes, so the SPI receive loop wrote up to 270 bytes into it - This corrupted the adjacent heap and triggered `multi_heap_poisoning` asserts on ESP32-S3 at boot (`CORRUPT HEAP` panic at `0x3fcb1dbc`) - Increase to 300 (safely above the 270-byte maximum) so the buffer is never overflowed ## Test plan - [ ] Flash ab7 board (ESP32-S3, BNO085 on SPI) and confirm no `CORRUPT HEAP` panic at boot - [ ] Verify BNO085 quaternion data flows normally after init 🤖 Generated with [Claude Code](https://claude.com/claude-code)

MrUnknownDE closed this issue

2026-04-05 17:51:34 +02:00

MrUnknownDE referenced this issue

2026-04-05 17:53:06 +02:00

EEPROM handling causes a LoadStore Error #507

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Reference: github/SlimeVR-Tracker-ESP#1