unit prjUSBaspOpenDevice;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls,
  USBasp;

type

  { TForm1 }

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Label1: TLabel;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Memo1Change(Sender: TObject);
    procedure Memo1DblClick(Sender: TObject);
  private
    FUSBasp: TUSBasp;
    procedure USBaspDataReceive(Sender: TObject; ASerialData: TByteArray;
      ASerialDataLength: SizeInt);
    procedure USBaspStatusChange(Sender: TObject);
  public

  end;

var
  Form1: TForm1;

implementation

{$R *.lfm}

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
begin
  FUSBasp := TUSBasp.Create;
  FUSBasp.OnUARTReceive := @USBaspDataReceive;
  FUSBasp.OnStatusChange := @USBaspStatusChange;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  FUSBasp.Connect;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  FUSBasp.Disconnect;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  FUSBasp.UARTOpen(19200, USBASP_UART_BYTES_8B, USBASP_UART_PARITY_NONE,
    USBASP_UART_STOP_1BIT);
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  FUSBasp.UARTClose;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  FUSBasp.Free;
end;

procedure TForm1.Memo1Change(Sender: TObject);
begin
  if Memo1.Lines.Count > 150 then
  begin
    Memo1.Lines.BeginUpdate;
    while Memo1.Lines.Count > 150 do
      Memo1.Lines.Delete(0);
    Memo1.Lines.EndUpdate;
  end;
end;

procedure TForm1.Memo1DblClick(Sender: TObject);
begin
  Memo1.Clear;
end;

procedure TForm1.USBaspDataReceive(Sender: TObject; ASerialData: TByteArray;
  ASerialDataLength: SizeInt);
begin
  Memo1.Lines.BeginUpdate;
  Memo1.Lines.Append(TEncoding.ASCII.GetString(ASerialData, 0, ASerialDataLength));
  Memo1.SelStart := Length(Memo1.Lines.Text);
  Memo1.VertScrollBar.Position := Memo1.Lines.Count;
  Memo1.Lines.EndUpdate;
end;

procedure TForm1.USBaspStatusChange(Sender: TObject);
begin
  Randomize;
  Label1.Caption := 'Changed' + IntToStr(Random(999));
end;

end.