Implement High-Speed RS-485 Application with i.MX RT Based on NXP SDK

[#1]

Hi:

   In industrial application, high RS485 Bus requires more real time performance, possible higher throughput.

Normally in NXP MCUxpresso SDK, it provides basic sample codes to demonstrate UART, DMA peripherals usage, but not RS485.

Though enough driver API could support such applicatio. But for newbie or fast prototype requirement, it's hard to build it in short time.

This design show how to use DMA for RS485 application, and how to use UART "Smart" Features to implement high throughput.