diff options
Diffstat (limited to 'EmbeddedPkg')
| -rw-r--r-- | EmbeddedPkg/Include/Library/SerialPortExtLib.h | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/EmbeddedPkg/Include/Library/SerialPortExtLib.h b/EmbeddedPkg/Include/Library/SerialPortExtLib.h index c7697bfe30..28705f0f20 100644 --- a/EmbeddedPkg/Include/Library/SerialPortExtLib.h +++ b/EmbeddedPkg/Include/Library/SerialPortExtLib.h @@ -29,15 +29,35 @@ #include <Protocol/SerialIo.h>
/**
- Set the serial device control bits.
- @return Always return EFI_UNSUPPORTED.
+ Assert or deassert the control signals on a serial port.
+ The following control signals are set according their bit settings :
+ . Request to Send
+ . Data Terminal Ready
+
+ @param[in] Control The following bits are taken into account :
+ . EFI_SERIAL_REQUEST_TO_SEND : assert/deassert the
+ "Request To Send" control signal if this bit is
+ equal to one/zero.
+ . EFI_SERIAL_DATA_TERMINAL_READY : assert/deassert
+ the "Data Terminal Ready" control signal if this
+ bit is equal to one/zero.
+ . EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE : enable/disable
+ the hardware loopback if this bit is equal to
+ one/zero.
+ . EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE : not supported.
+ . EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE : enable/
+ disable the hardware flow control based on CTS (Clear
+ To Send) and RTS (Ready To Send) control signals.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
**/
RETURN_STATUS
EFIAPI
SerialPortSetControl (
- IN UINT32 Control
+ IN UINT32 Control
);
/**
|