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gpio.pas
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gpio.pas
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{
/***************************************************************************
gpio.pas
------------
***************************************************************************/
*****************************************************************************
This file is part of the Lazarus packages by Andreas Jakobsche
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
}
unit GPIO;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, EvMsg;
{$DEFINE BPLUS}
const
NC = 32; {not connected = no related port}
type
TPortDirection = (pdInput, pdOutput, pdOutputHigh, pdOutputLow);
TGPIOAddress = 0..NC;
TEdge = (eRising, eFalling);
TEdges = set of TEdge;
{ TCustomGPIOPort }
TCustomGPIOPort = class(TComponent)
private
procedure GPIOEventRequest(var Msg); message 'GPIOEvent';
private
FAddress: TGPIOAddress;
FValue: Boolean;
FOnGPIOEvent: TNotifyEvent;
function GetActiveLow: Boolean;
function GetDirection: TPortDirection;
procedure SetActiveLow(AValue: Boolean);
function GetActiveLowFilename: string;
function GetEdges: TEdges; virtual;
procedure SetDirection(AValue: TPortDirection);
procedure SetEdges(Value: TEdges); virtual;
function GetPortDirName: string;
function GetPortDirectionFileName: string;
function GetPortEdgeFileName: string;
function GetPortValueFileName: string;
function GetValue: Boolean;
procedure SetValue(Value: Boolean);
procedure ForcePortFS;
property ActiveLowFilename: string read GetActiveLowFileName;
property PortDirName: string read GetPortDirName;
property PortDirectionFileName: string read GetPortDirectionFileName;
property PortEdgeFileName: string read GetPortEdgeFileName;
property PortValueFileName: string read GetPortValueFileName;
protected
procedure DoGPIOEvent; virtual;
property ActiveLow: Boolean read GetActiveLow write SetActiveLow;
property Direction: TPortDirection read GetDirection write SetDirection;
property Edges: TEdges read GetEdges write SetEdges; {sets also MessageGenerator, if it is nil}
property Value: Boolean read GetValue write SetValue;
public
published
property Address: TGPIOAddress read FAddress write FAddress;
end;
TBinaryIO = class(TCustomGPIOPort)
public
end;
TBinaryInput = class(TBinaryIO)
public
constructor Create(AnOwner: TComponent); override;
property Value: Boolean read GetValue;
end;
{ TBinaryOutput }
TBinaryOutput = class(TBinaryIO)
public
constructor Create(AnOwner: TComponent); override;
property Value: Boolean write SetValue;
end;
{ TEdgeDrivenInput }
TEdgeDrivenInput = class(TBinaryInput, IMessageReceiver)
private
class var FMessageGenerator: TMessageGenerator;
function GetEdgeFalling: Boolean;
function GetEdgeRising: Boolean;
private
FEdges: TEdges;
FOnEdge, FOnFallingEdge, FOnRisingEdge: TNotifyEvent;
PrevValue: Boolean;
function GetEdges: TEdges; override;
function GetMessageGenerator: TMessageGenerator;
procedure SetEdges(AValue: TEdges); override; {connects to FMessageGenerator, if
Value <> [] oder disconnects, if AValue = []}
procedure SetMessageGenerator(AValue: TMessageGenerator);
property EdgeRising: Boolean read GetEdgeRising;
property EdgeFalling: Boolean read GetEdgeFalling;
protected
procedure EdgeEvent; virtual;
procedure RisingEdgeEvent; virtual;
procedure FallingEdgeEvent; virtual;
public
destructor Destroy; override;
procedure GenerateEvents; virtual;
property MessageGenerator: TMessageGenerator read GetMessageGenerator
write SetMessageGenerator; {Ignore this property, if this is the
only class you want to connect to a thread and all its instances use the
same thread instance. Assign this to the same property of another class,
after Edges is assigned to something <> [], if a further class is supposed
to use the same thread. Alternatively create a TMessageGenerator
instance and assign it to 1 instance of every classes (or the classes
themselves) that will have to use the same thread instance.}
published
property Edges; {sets also MessageGenerator, if it is nil}
property OnEdge: TNotifyEvent read FOnEdge write FOnEdge;
property OnFallingEdge: TNotifyEvent read FOnFallingEdge write FOnFallingEdge;
property OnRisingEdge: TNotifyEvent read FOnRisingEdge write FOnRisingEdge;
end;
{ TGPIOPort }
TGPIOPort = class(TCustomGPIOPort)
private
{function GetTerminal: Byte;}
{procedure SetTerminal(Value: Byte);}
protected
public
{property Terminal: Byte read GetTerminal write SetTerminal;}
constructor Create(TheOwner: TComponent); override;
function EdgeFalling: Boolean;
function EdgeRising: Boolean;
published
property ActiveLow;
property Direction;
property Edges: TEdges read GetEdges write SetEdges;
property OnGPIOEvent: TNotifyEvent read FOnGPIOEvent write FOnGPIOEvent;
end;
procedure Register;
implementation
uses sysfs, Patch;
const
ExportFileName = '/sys/class/gpio/export';
UnExportFileName = '/sys/class/gpio/unexport';
PortDirNameTemplate = '/sys/class/gpio/gpio%d';
type
TJ8PinNumbers = 0..106; {0 = not connected}
TGPIOPins = array[TGPIOAddress] of TJ8PinNumbers;
const
{$IFDEF REV1}
GPIOPins: TGPIOPins = (
{ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15} {GPIO}
3, 5, 0, 0, 7, 0, 0, 26, 24, 21, 19, 23, 0, 0, 8, 10, {Pin}
{ 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31} {GPIO}
0, 11, 12, 0, 0, 13, 15, 16, 18, 22, 0, 0,103,104,105,106); {PIN}
{$ENDIF}
{$IFDEF REV2}
GPIOPins: TGPIOPins = (
{ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15} {GPIO}
0, 0, 3, 5, 7, 29, 31, 26, 24, 21, 19, 23, 32, 33, 8, 10, {Pin}
{ 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32} {GPIO}
36, 11, 12, 0, 0, 0, 15, 16, 18, 22, 0, 13,103,104,105,106, 0);{Pin}
{$ENDIF}
{$IFDEF BPLUS}
GPIOPins: TGPIOPins = (
{ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15} {GPIO}
0, 0, 3, 5, 7, 0, 0, 26, 24, 21, 19, 23, 0, 0, 8, 10, {Pin}
{ 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32} {GPIO}
0, 11, 12, 35, 38, 40, 15, 16, 18, 22, 37, 13,103,104,105,106, 0);{Pin}
{$ENDIF}
{ TBinaryOutput }
constructor TBinaryOutput.Create(AnOwner: TComponent);
begin
inherited Create(AnOwner);
Direction := pdOutput
end;
{ TEdgeDrivenInput }
function TEdgeDrivenInput.GetEdgeFalling: Boolean;
begin
Result := False
end;
function TEdgeDrivenInput.GetEdgeRising: Boolean;
begin
Result := False
end;
function TEdgeDrivenInput.GetEdges: TEdges;
begin
Result := FEdges;
end;
function TEdgeDrivenInput.GetMessageGenerator: TMessageGenerator;
begin
Result := FMessageGenerator
end;
procedure TEdgeDrivenInput.SetEdges(AValue: TEdges);
begin
if AValue <> FEdges then begin
if FEdges = [] then begin
if not Assigned(FMessageGenerator) then
FMessageGenerator := TMessageGenerator.Create(not (csDesigning in ComponentState));
while not FMessageGenerator.AddReceiver(Self) do;
end
else
if AValue = [] then begin
while not FMessageGenerator.RemoveReceiver(Self) do;
if FMessageGenerator.ReceiverCount = 0 then FreeAndNil(FMessageGenerator)
end;
FEdges := AValue
end
end;
procedure TEdgeDrivenInput.SetMessageGenerator(AValue: TMessageGenerator);
begin
if AValue <> FMessageGenerator then begin
if Assigned(FMessageGenerator) then while not FMessageGenerator.RemoveReceiver(Self) do;
if FMessageGenerator.ReceiverCount = 0 then FMessageGenerator.Free;
FMessageGenerator := AValue;
while FMessageGenerator.AddReceiver(Self) do
end;
end;
procedure TEdgeDrivenInput.EdgeEvent;
begin
if Assigned(FOnEdge) then FOnEdge(Self)
end;
procedure TEdgeDrivenInput.RisingEdgeEvent;
begin
if Assigned(FOnRisingEdge) then FOnRisingEdge(Self)
end;
procedure TEdgeDrivenInput.FallingEdgeEvent;
begin
if Assigned(FOnFallingEdge) then FOnFallingEdge(Self)
end;
destructor TEdgeDrivenInput.Destroy;
begin
while not FMessageGenerator.RemoveReceiver(Self) do;
if FMessageGenerator.ReceiverCount = 0 then FMessageGenerator.Free;
inherited Destroy;
end;
procedure TEdgeDrivenInput.GenerateEvents;
begin
if Edges <> [] then begin
if Value <> PrevValue then begin
if (eRising in Edges) and EdgeRising then RisingEdgeEvent;
if (eFalling in Edges) and EdgeFalling then FallingEdgeEvent;
if (Edges = [eRising, eFalling]) and (EdgeRising or EdgeFalling) then
EdgeEvent
end;
PrevValue := FValue
end;
end;
{ TBinaryInput }
constructor TBinaryInput.Create(AnOwner: TComponent);
begin
inherited Create(AnOwner);
Direction := pdInput;
end;
{var
GPIOs: array[TJ8PinNumbers] of TGPIOAddress;}
function TCustomGPIOPort.GetPortEdgeFileName: string;
begin
ForcePortFS;
Result := BuildFileName(PortDirName, 'edge')
end;
procedure TCustomGPIOPort.GPIOEventRequest(var Msg);
type
TGPIOMessage = record
Msg: ShortString;
Address: Integer;
end;
begin
if TGPIOMessage(Msg).Address = Address then DoGPIOEvent;
end;
function TCustomGPIOPort.GetActiveLow: Boolean;
begin
ForcePortFS;
if GetIntAttribute(ActiveLowFileName) = 0 then Result := False
else Result := True
end;
function TCustomGPIOPort.GetActiveLowFilename: string;
begin
Result := BuildFileName(PortDirName, 'active_low');
end;
function TCustomGPIOPort.GetPortDirName: string;
begin
Result := Format(PortDirNameTemplate, [FAddress])
end;
function TCustomGPIOPort.GetPortDirectionFileName: string;
begin
Result := BuildFileName(PortDirName, 'direction')
end;
function TCustomGPIOPort.GetPortValueFileName: string;
begin
Result := BuildFilename(PortDirname, 'value')
end;
{function TGPIOPort.GetTerminal: Byte;
begin
Result := GPIOPins[Address]
end;}
function TCustomGPIOPort.GetValue: Boolean;
begin
ForcePortFS;
case Direction of
pdInput: FValue := GetBooleanAttribute(PortValueFileName)
end;
Result := FValue;
end;
procedure TCustomGPIOPort.ForcePortFS;
var F: TextFile;
begin
if not FileExists(PortDirName) then begin
AssignFile(F, ExportFilename);
Rewrite(F);
Write(F, FAddress);
CloseFile(F)
end;
end;
procedure TCustomGPIOPort.DoGPIOEvent;
begin
end;
procedure TCustomGPIOPort.SetActiveLow(AValue: Boolean);
begin
ForcePortFS;
SetAttribute(ActiveLowFileName, AValue);
end;
{procedure TGPIOPort.SetTerminal(Value: Byte);
begin
FAddress := GPIOs[Value]
end;}
procedure TCustomGPIOPort.SetValue(Value: Boolean);
begin
ForcePortFS;
FValue := Value;
if Direction = pdOutput then begin
SetAttribute(PortValueFileName, FValue);
end;
end;
function TCustomGPIOPort.GetDirection: TPortDirection;
var
x: string;
begin
Result := pdInput;
ForcePortFS;
x := GetAttribute(PortDirectionFileName);
if x <> 'in' then Result := pdOutput
end;
function TCustomGPIOPort.GetEdges: TEdges;
var
x: string;
begin
Result := [];
x := GetAttribute(PortEdgeFileName);
if x = 'rising' then Result := [eRising]
else if x = 'falling' then Result := [eFalling]
else if x = 'both' then Result := [erising, eFalling]
end;
procedure TCustomGPIOPort.SetEdges(Value: TEdges);
begin
ForcePortFS;
if Value = [eRising] then SetAttribute(PortEdgeFileName, 'rising')
else if Value = [eFalling] then SetAttribute(PortEdgeFileName, 'falling')
else if Value = [eRising, eFalling] then SetAttribute(PortEdgeFileName, 'both')
else SetAttribute(PortEdgeFileName, 'none')
{Ein-/Ausschließen von Callbacks ist noch erforderlich
(udev-Regeln? uevent?)}
end;
procedure TCustomGPIOPort.SetDirection(AValue: TPortDirection);
begin
ForcePortFS;
case AValue of
pdOutput: SetAttribute(PortDirectionFileName, 'out');
pdOutputHigh: SetAttribute(PortDirectionFileName, 'high');
pdOutputLow: SetAttribute(PortDirectionFileName, 'low');
else SetAttribute(PortDirectionFileName, 'in');
end;
end;
{procedure TCustomGPIOPort.DoGPIOEvent;
begin
if Assigned(OnGPIOEvent) then OnGPIOEvent(Self)
end;}
constructor TGPIOPort.Create(TheOwner: TComponent);
begin
inherited Create(TheOwner);
FAddress := NC;
end;
function TGPIOPort.EdgeFalling: Boolean;
begin
Result := Value = False
end;
function TGPIOPort.EdgeRising: Boolean;
begin
Result := Value = True
end;
procedure Register;
begin
RegisterComponents('Hardware', [TBinaryInput, TEdgeDrivenInput, TBinaryOutput,
TGPIOPort]);
end;
{var
i: TGPIOAddress;
initialization
for i := Low(TGPIOAddress) to High(TGPIOAddress) do
if GPIOPins[i] <> 0 then GPIOs[GPIOPins[i]] := i
else GPIOs[i] := 32 }
end.