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Fix buffer underflow #429

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Merged
marcelstoer merged 1 commit into from
Apr 10, 2026
Merged

Fix buffer underflow #429

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4 changes: 3 additions & 1 deletion src/SSD1306I2C.h
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Original file line number Diff line number Diff line change
Expand Up @@ -130,8 +130,10 @@ class SSD1306I2C : public OLEDDisplay {
}

private:
// Reserve 1 byte before the framebuffer so display() can safely write the
// I2C control byte (0x40) to buffer[-1] without accessing unallocated memory.
int getBufferOffset(void) {
return 0;
return 1;
}

inline void sendCommand(uint8_t command) __attribute__((always_inline)) {
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