UART Extended-Function Receive FIFO Count

The UART Extended-Function Receive FIFO Count feature returns the number of unread bytes currently stored in the extended-function UART receive FIFO buffer. It helps software determine how much data is available for reading without risking buffer underflow or overrun. This is useful for polling or managing high-speed or bursty UART communication.

This feature works together with UART Extended-Function Receive Data by reporting how many bytes are available in the buffer. It should be checked before reading from the receive FIFO to avoid reading invalid or incomplete data.

UartEFRxFifoCnt node

• Access mode: Read Only
• Node type: Uint32

You can use the eSDK API functions to get the node’s current value.

For information about related features, see General Purpose Input/Output Control Features.