Uart DMA

Setup the RCC and timer value. 

 

 

 

Usart with DMA will be used to reduce the CPU loads. 

Pros

1. Using DMA with UART2 allows long data transmissions to run in the background without blocking the CPU.
2. UART DMA provides stable and reliable streaming, which is ideal for continuous debug logs and telemetry.
3. Because UART has no strict timing requirements, DMA works smoothly and consistently without communication errors.
4. DMA greatly reduces CPU load by eliminating the need for an interrupt on every transmitted byte.

Cons

1. Receiving data with UART DMA is more complicated because it requires idle-line detection or a circular buffer to determine message boundaries.
2. UART does not inherently define packet start and end, so additional logic is needed to parse structured messages.
3. For very small or short messages, DMA may add unnecessary complexity compared to simple interrupt-based transmission.

Usart setup

 

※ 참고자료:

https://www.youtube.com/watch?v=V950P9V1EXA&t=2345s