Why are FIFO One-quarter full, Half-full, three-quarter full interrupts provided in a UART RX FIFO? What are their use cases?


1 weeks ago


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I am implementing a protocol decoder which receives bytes through UART of a microcontroller. The ISR takes bytes from the UART peripheral and puts it in a ring buffer. The main loop reads from the ring buffer and runs a state machine to decode it.

The UART internally has a 32-byte receive FIFO, and provides interrupts when this FIFO is quarter-full, half-full, three-quarter full and completely full. How should i determine which of these interrupts should trigger my ISR? What is the tradeoff involved?

Note - The protocol involves packets of 32-byte (fixed length), send every 10ms.

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