Difference between revisions of "Unit GPIO"

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Revision as of 05:29, 27 September 2016

Return to Unit Reference


Description

GPIO devices represent the external or internal pins available on most system on chip (SoC) devices to provide control and interfacing capabilities for both hardware and software.

This unit maintains pin numbering exactly as per the SoC documentation but abstracts other features such as alternate function selects to avoid exposing chip specific values via the API.

Not all GPIO devices support the same feature set so the GPIODeviceProperties function returns a structure which describes the number of pins as well as minimum and maximum pin numbers along with a set of flags that indicate what functionality is supported by the device.

Multiple GPIO devices can be accomodated, each one is registered with this unit when the driver for the device is loaded and initialized. This unit includes functions for enumerating the devices that are available and each function takes a GPIODevice parameter to allow specifying the exact device to control.

Simplified versions of many of the functions in this unit are provided in the Platform unit to allow control of the default GPIO device and in cases where there is only one device registered these functions will provide most of the capability required.

Constants

To be documented

Type definitions

To be documented

Public variables

To be documented

Function declarations


Initialization functions

[Expand] 
procedure GPIOInit;
Description: To be documented


GPIO functions

[Expand] 
function GPIODeviceStart(GPIO:PGPIODevice):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceStop(GPIO:PGPIODevice):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceRead(GPIO:PGPIODevice; Reg:LongWord):LongWord;
Description: To be documented


[Expand] 
procedure GPIODeviceWrite(GPIO:PGPIODevice; Reg,Value:LongWord);
Description: To be documented


[Expand] 
function GPIODeviceInputGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceInputWait(GPIO:PGPIODevice; Pin,Trigger,Timeout:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceInputEvent(GPIO:PGPIODevice; Pin,Trigger,Flags,Timeout:LongWord; Callback:TGPIOCallback; Data:Pointer):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceInputCancel(GPIO:PGPIODevice; Pin:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceOutputSet(GPIO:PGPIODevice; Pin,Level:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODevicePullGet(GPIO:PGPIODevice;Pin:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODevicePullSelect(GPIO:PGPIODevice; Pin,Mode:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceFunctionGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceFunctionSelect(GPIO:PGPIODevice; Pin,Mode:LongWord):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceProperties(GPIO:PGPIODevice; Properties:PGPIOProperties):LongWord;
Description: To be documented


[Expand] 
function GPIODeviceCreate:PGPIODevice;
Description: Create a new GPIO entry


[Expand] 
function GPIODeviceCreateEx(Size:LongWord):PGPIODevice;
Description: Create a new GPIO entry


[Expand] 
function GPIODeviceDestroy(GPIO:PGPIODevice):LongWord;
Description: Destroy an existing GPIO entry


[Expand] 
function GPIODeviceRegister(GPIO:PGPIODevice):LongWord;
Description: Register a new GPIO in the GPIO table


[Expand] 
function GPIODeviceDeregister(GPIO:PGPIODevice):LongWord;
Description: Deregister a GPIO in the GPIO table


[Expand] 
function GPIODeviceFind(GPIOId:LongWord):PGPIODevice;
Description: To be documented


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


[Expand] 
function GPIODeviceFindByDescription(const Description:String):PGPIODevice; inline;
Description: To be documented


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


[Expand] 
function GPIODeviceNotification(GPIO:PGPIODevice; Callback:TGPIONotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: To be documented


RTL GPIO functions

[Expand] 
function SysGPIOAvailable:Boolean;
Description: Check if a GPIO device is available


[Expand] 
function SysGPIOInputGet(Pin:LongWord):LongWord;
Description: Get the current state of a GPIO input pin


[Expand] 
function SysGPIOInputWait(Pin,Trigger,Timeout:LongWord):LongWord;
Description: Wait for the state of a GPIO input pin to change


[Expand] 
function SysGPIOInputEvent(Pin,Trigger,Timeout:LongWord; Callback:TGPIOCallback; Data:Pointer):LongWord;
Description: Schedule a function to be called when the state of a GPIO input pin changes


[Expand] 
function SysGPIOOutputSet(Pin,Level:LongWord):LongWord;
Description: Set the state of a GPIO output pin


[Expand] 
function SysGPIOPullGet(Pin:LongWord):LongWord;
Description: Get the current pull state of a GPIO pin


[Expand] 
function SysGPIOPullSelect(Pin,Mode:LongWord):LongWord;
Description: Change the pull state of a GPIO pin


[Expand] 
function SysGPIOFunctionGet(Pin:LongWord):LongWord;
Description: Get the current function of a GPIO pin


[Expand] 
function SysGPIOFunctionSelect(Pin,Mode:LongWord):LongWord;
Description: Change the function of a GPIO pin


GPIO helper functions

[Expand] 
function GPIOGetCount:LongWord; inline;
Description: Get the current GPIO count


[Expand] 
function GPIODeviceGetDefault:PGPIODevice; inline;
Description: Get the current default GPIO device


[Expand] 
function GPIODeviceSetDefault(GPIO:PGPIODevice):LongWord;
Description: Set the current default GPIO device


[Expand] 
function GPIODeviceCheck(GPIO:PGPIODevice):PGPIODevice;
Description: Check if the supplied GPIO is in the GPIO table


[Expand] 
function GPIODeviceCreateEvent(GPIO:PGPIODevice; Pin:PGPIOPin; Callback:TGPIOCallback; Data:Pointer; Timeout:LongWord):PGPIOEvent;
Description: Create a new event using the supplied parameters


[Expand] 
function GPIODeviceDestroyEvent(GPIO:PGPIODevice; Event:PGPIOEvent):LongWord;
Description: Destroy an existing event


[Expand] 
function GPIODeviceRegisterEvent(GPIO:PGPIODevice; Pin:PGPIOPin; Event:PGPIOEvent):LongWord;
Description: Register an event in the event list of the supplied Pin


[Expand] 
function GPIODeviceDeregisterEvent(GPIO:PGPIODevice;Pin:PGPIOPin;Event:PGPIOEvent):LongWord;
Description: Deregister an event in the event list of the supplied Pin


[Expand] 
procedure GPIOLog(Level:LongWord; GPIO:PGPIODevice; const AText:String);
Description: To be documented


[Expand] 
procedure GPIOLogInfo(GPIO:PGPIODevice; const AText:String);
Description: To be documented


[Expand] 
procedure GPIOLogError(GPIO:PGPIODevice; const AText:String);
Description: To be documented


[Expand] 
procedure GPIOLogDebug(GPIO:PGPIODevice; const AText:String);
Description: To be documented


[Expand] 
function GPIOPinToString(Pin:LongWord):String;
Description: To be documented


[Expand] 
function GPIOLevelToString(Level:LongWord):String;
Description: To be documented


[Expand] 
function GPIOTriggerToString(Trigger:LongWord):String;
Description: To be documented


[Expand] 
function GPIOPullToString(Value:LongWord):String;
Description: To be documented


[Expand] 
function GPIOFunctionToString(Value:LongWord):String;
Description: To be documented


Return to Unit Reference

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