USART callbacks.
This chapter starts with an overview of the features and objectives of ASF4. The context in the larger SW/Tools ecosystem is defined, giving a relation between the ASF4, START, and the IDE. A high-level work-flow overview is presented and documentation resources are described, to give insight into which references to use for what.
USART status Status descriptor holds the current status of transfer.
Asynchronous USART descriptor structure.