hard20 pts · first answer countsconcurrencydata-structures

A lock-free ISR ring buffer

A UART ISR writes into a ring buffer and the main loop reads from it, with no critical sections. What makes this safe on a single-core Cortex-M?

A.Making the buffer array large enough that it never fillsB.Using int8_t indices so updates are fasterC.Only the ISR writes head, only main writes tail, indices are aligned 32-bit volatile values, and data is stored before head is updatedD.Calling the read function from inside the ISR as well

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A lock-free ISR ring buffer

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