// uart.h

typedef enum {
  UartSuccess,
  UartNoData,
  UartError,
  UartNotReady
} UART_STATUS, *PUART_STATUS;
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Windows Driver Kit DDI reference (ne-uart-uart_status)

UART_STATUS enumeration

Description

Defines values for the status of a UART operation.

Constants

`UartSuccess`

The operation was successful, for example if data was available.

`UartNoData`

No data is available, but not due to an error condition.

`UartError`

A UART error such as overrun, parity, framing, etc.

`UartNotReady`

The device is not ready.

UART_STATUS - NtDoc