UART Serial (Bare-Metal)

Purpose

Implement UART/USART for debug console and device communication: baud rate calculation, 8N1 framing, polling and interrupt-driven I/O, overrun handling, and optional DMA basics.

When to Use

• First printf/log output on new hardware
• Serial protocol to sensor/module
• Replacing blocking HAL_UART with minimal driver
• Fixing garbled or missing characters

Workflow

1. Baud rate (STM32)