UART Extended-Function Transmit FIFO Count

The UART Extended-Function Transmit FIFO Count feature reports how many bytes are currently queued in the extended-function UART transmit FIFO buffer. It helps software avoid overfilling the buffer by checking available space before writing additional data. This is useful for managing flow control and ensuring reliable transmission during high-throughput communication.

This feature complements the UART Extended-Function Transmit Data feature by showing how much data is already in the transmit FIFO. It should be polled before writing new data to prevent exceeding the buffer limit.

UartEFTxFifoCnt 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.