RE: Async UART; FIFO buffer; buffer length de-synced

Hictle — Fri, 27 Jun 2025 10:10:09 GMT

I’ve encountered a similar issue before when using async UART with FIFO. In my case, it helped to double-check how many bytes were actually flushed vs. how many were pushed into the buffer. slice master
Sometimes uart_tx_done might return before all data is fully shifted out, depending on the implementation.

Have you tried adding a mutex or flag around your tx_done callback to avoid race conditions?

Also, what hardware/SDK version are you using?