Add STM32 ring buffer driver#79
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Implements a lightweight ring buffer driver for the STM32 embedded system.
Files Added
Implementation Details
Uses a fixed-size circular byte buffer with configurable size via RING_BUF_SIZE (128 bytes default)
Empty/full distinction handled by sacrificing one slot, giving an effective capacity of size - 1 bytes
ring_buffer_full is kept as a static internal helper, not exposed in the public API
All index arithmetic uses modulo wrapping to keep indices within bounds
Read and write operations return bool to indicate success or failure (empty/full guard)