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whitecatboard / Lua-RTOS-ESP32

Lua RTOS for ESP32
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Heap curruption from spi readwrite function #345

Closed Mynogs closed 3 years ago

Mynogs commented 4 years ago

With the spi readwrite function, multiples of four bytes must always be written/readed. Otherwise the heap will be damaged.

Here are five different tests:

local recv = device: readwrite (address >> 16, address >> 8, address, 4, 5)
CORRUPT HEAP: Bad tail at 0x3ffbe101. Expected 0xbaad5678 got 0xba000000

local recv = device: readwrite (address >> 16, address >> 8, address, 4, 5, 6)
CORRUPT HEAP: Bad tail at 0x3ffbe102. Expected 0xbaad5678 got 0xbaad0000
local recv = device: readwrite (address >> 16, address >> 8, address, 4, 5, 7)
CORRUPT HEAP: Bad tail at 0x3ffbe103. Expected 0xbaad5678 got 0xbaad5600
local recv = device: readwrite (address >> 16, address >> 8, address, 4, 5, 7, 8)
*** Works!
local recv = device: readwrite (address >> 16, address >> 8, address, 4, 5, 7, 8, 9)
CORRUPT HEAP: Bad tail at 0x3ffd1741. Expected 0xbaad5678 got 0xba000000

When I send 5 bytes, 3 bytes in the heap are corrupted.

When I send 6 bytes, 2 bytes in the heap are corrupted.

When I send 7 bytes, 1 byte in the heap is corrupt.

If I send 8 bytes there is no problem.

When I send 9 bytes, 3 bytes in the heap are corrupted.

etc....

Best wishes

André