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Although UARTs have been around for a long time, there are still many uses for them on embedded devices due to their minimal hardware requirements. Whether the UART is used for inter-device communication or for a simple terminal interface, it can be a real challenge to create a driver that not only provides reliable high speed operation, but maintains a simple API. This post explains the steps and design considerations that were made while creating the UART driver for the DZX Embedded SDK on the NXP LPC17xx platforms.

Latency is a major design risk for most embedded software engineers. The Embedded SDK provides several methods for measuring the extra latency imposed by the software.