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Syscall index: 0x1BBB
Function signature: int Serial_Peek(int idx, unsigned char* out)
Reads, without removing, a single byte from a specified position in the serial input buffer.
- idx - index in the input buffer of the byte to read;
- out - pointer to unsigned char that will receive the fetched byte.
- 0 if successful,
- 1 if the required byte is not available (there are less bytes in the buffer than idx),
- 3 if the serial channel is not open.