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uart-serial-baremetal

Use when configuring UART baud rate/BRR, polling or IRQ-driven TX/RX, serial printf retargeting, USART interrupts, or UART with DMA on bare-metal MCUs. Not for the DMA stream: use dma-baremetal.

.devin/skills/uart-serial-baremetal/SKILL.md

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Last checked
Nov 4, 2026

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Repository last updated
Sep 28, 2026
License
Apache-2.0

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# UART serial on bare metal

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The first log output on new hardware is needed, a serial protocol to a module must be implemented, a blocking HAL UART is being replaced, or characters arrive garbled or go missing. |
| Authority | Read-only: emits baud arithmetic, register sequences, ISR and retarget code to chat; the user places them in the firmware. Rollback is not needed because no file is written. No remote mutation. |
| Side effect | Chat output only. |
| Done | The baud register value is computed from the actual peripheral clock with the reference manual formula, the pins are muxed, TX and RX work polled, the interrupt path clears overrun the way the manual states, and `printf` reaches the port when requested. |

## Inputs

- Target part and USART instance, with the bus it sits on and that bus's clock after prescaling.