2026-06-04
STM32 USART Interrupt-Driven Ring Buffer: Lock-Free RX/TX on STM32F4
A practical guide to implementing a lock-free ring buffer for USART interrupt-driven communication on STM32F4: register-level USART setup, circular buffer design with power-of-2 masking, RX/TX interrupt handlers, and a fully working echo/command parser.
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