Returns event flags set by the previous UART transaction
Device
Integer — the UART transaction event flags bitfield
This method returns an integer combining the event flags detected — each flag represents a single bit in the returned value. The event flags are cleared after being read.
| Event Flag Constant | Value | Description | Notes |
|---|---|---|---|
| READ_READY | 1 | Data is available to be read | As per the default callback |
| WRITE_DONE | 2 | Transmit completed | An asynchronous alternative to uart.flush() |
| NOISE_ERROR | 4 | Noise was detected in the start bit | |
| FRAME_ERROR | 8 | A framing error occurred | The designated start and stop bits could not be found |
| PARITY_ERROR | 16 | A parity error occurred | The parity of the number of 1 bits disagrees with that specified by the parity bit |
| OVERRUN_ERROR | 32 | An over-run error occurred | The receive buffer was full when another character arrived |
| LINE_IDLE | 64 | Line idle was detected | This is triggered by an entire frame of 1s followed by the start bit of the next frame which contains data |
| WRITE_HALF_DONE | 128 | TX FIFO half full | This is triggered when the UART transmission buffer crosses the half-full point |
The values assigned to the constants may change in a future impOS™ release.