Difference between revisions of "Unit UART"

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Revision as of 05:54, 27 September 2016

Return to Unit Reference


Description

UART (Universal Asynchronous Receiver Transmitter) devices represent the industry standard serial communications devices that are available on almost every system.

This unit implements the framework for UART devices and provides a standardized API to allow driver specific implementation to be abstracted. All UART devices are also represented as a serial device and this unit handles the relationship between the two devices.

Each UART device returns a set of properties that describe the capabilities of the device and includes a set of flags that indicate what features are supported.

Reads and writes to UART devices are unbuffered and simply pass raw data to and from the caller unless the serial interface is used instead which includes buffering of transmitted and received data. Both reads and writes allow for non blocking so that a caller can avoid waiting for received data to be available or the device to be ready to transmit.

Constants

To be documented

Type definitions

To be documented

Public variables

To be documented

Function declarations


Initialization functions

[Expand] 
procedure UARTInit;
Description: Initialize the UART unit and UART device table


UART functions

[Expand] 
function UARTDeviceOpen(UART:PUARTDevice; BaudRate,DataBits,StopBits,Parity,FlowControl:LongWord):LongWord;
Description: To be documented


[Expand] 
function UARTDeviceClose(UART:PUARTDevice):LongWord;
Description: To be documented


[Expand] 
function UARTDeviceRead(UART:PUARTDevice; Buffer:Pointer; Size,Flags:LongWord;var Count:LongWord):LongWord;
Description: To be documented


[Expand] 
function UARTDeviceWrite(UART:PUARTDevice; Buffer:Pointer; Size,Flags:LongWord;var Count:LongWord):LongWord;
Description: To be documented


[Expand] 
function UARTDeviceStatus(UART:PUARTDevice):LongWord;
Description: To be documented


[Expand] 
function UARTDeviceProperties(UART:PUARTDevice; Properties:PUARTProperties):LongWord;
Description: To be documented


[Expand] 
function UARTDeviceCreate:PUARTDevice;
Description: Create a new UART entry


[Expand] 
function UARTDeviceCreateEx(Size:LongWord):PUARTDevice;
Description: Create a new UART entry


[Expand] 
function UARTDeviceDestroy(UART:PUARTDevice):LongWord;
Description: Destroy an existing UART entry


[Expand] 
function UARTDeviceRegister(UART:PUARTDevice):LongWord;
Description: Register a new UART in the UART table


[Expand] 
function UARTDeviceDeregister(UART:PUARTDevice):LongWord;
Description: Deregister a UART from the UART table


[Expand] 
function UARTDeviceFind(UARTId:LongWord):PUARTDevice;
Description: To be documented


[Expand] 
function UARTDeviceFindByName(const Name:String):PUARTDevice; inline;
Description: To be documented


[Expand] 
function UARTDeviceFindByDescription(const Description:String):PUARTDevice; inline;
Description: To be documented


[Expand] 
function UARTDeviceEnumerate(Callback:TUARTEnumerate; Data:Pointer):LongWord;
Description: To be documented


[Expand] 
function UARTDeviceNotification(UART:PUARTDevice; Callback:TUARTNotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: To be documented


UART serial functions

[Expand] 
function UARTSerialDeviceOpen(Serial:PSerialDevice; BaudRate,DataBits,StopBits,Parity,FlowControl,ReceiveDepth,TransmitDepth:LongWord):LongWord;
Description: To be documented


[Expand] 
function UARTSerialDeviceClose(Serial:PSerialDevice):LongWord;
Description: To be documented


[Expand] 
function UARTSerialDeviceRead(Serial:PSerialDevice; Buffer:Pointer; Size,Flags:LongWord; var Count:LongWord):LongWord;
Description: To be documented


[Expand] 
function UARTSerialDeviceWrite(Serial:PSerialDevice; Buffer:Pointer; Size,Flags:LongWord; var Count:LongWord):LongWord;
Description: To be documented


[Expand] 
function UARTSerialDeviceStatus(Serial:PSerialDevice):LongWord;
Description: To be documented


[Expand] 
function UARTSerialDeviceProperties(Serial:PSerialDevice; Properties:PSerialProperties):LongWord;
Description: To be documented


UART helper functions

[Expand] 
function UARTGetCount:LongWord; inline;
Description: Get the current UART count


[Expand] 
function UARTDeviceGetDefault:PUARTDevice; inline;
Description: Get the current default UART device


[Expand] 
function UARTDeviceSetDefault(UART:PUARTDevice):LongWord;
Description: Set the current default UART device


[Expand] 
function UARTDeviceCheck(UART:PUARTDevice):PUARTDevice;
Description: Check if the supplied UART is in the UART table


[Expand] 
procedure UARTLog(Level:LongWord;UART:PUARTDevice; const AText:String);
Description: To be documented


[Expand] 
procedure UARTLogInfo(UART:PUARTDevice; const AText:String); inline;
Description: To be documented


[Expand] 
procedure UARTLogError(UART:PUARTDevice; const AText:String); inline;
Description: To be documented


[Expand] 
procedure UARTLogDebug(UART:PUARTDevice; const AText:String); inline;
Description: To be documented


UART serial helper functions

[Expand] 
function UARTSerialDeviceReceive(UART:PUARTDevice):LongWord;
Description: To be documented


[Expand] 
function UARTSerialDeviceTransmit(UART:PUARTDevice):LongWord;
Description: To be documented


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