hid_testing_utils.pas

{ Copyright (C) 2013-2019  S. V. Pantazi (svpantazi@gmail.com)

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  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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}

unit hid_testing_utils;

{$mode objfpc}{$H+}

interface

uses
  sysutils,
  libusbhid;

const
  REPORT_COUNT=16;
  REPORT_LENGTH=128;

type

  THIDDeviceReportData=array[0..REPORT_COUNT-1] of record
    dataLen: Integer;
    hid_data,
    hid_data_copy:array[0..REPORT_LENGTH-1] of byte;
  end;


var
  reportIdx,
  i:integer;
  device_context:libusbhid_context;
  hidReportData:THIDDeviceReportData;
  dataString:string;

  //procedure PrintAndCompareReport(reportIdx:integer);
  function PrintAndCompareReport(reportIdx:integer;DisplayDetail:Byte):Boolean;
  function ReportChanged(reportNum:byte):boolean;

implementation

function PrintAndCompareReport(reportIdx:integer;DisplayDetail:Byte):Boolean;
var
  i:  Integer;
  Report_Changed:Boolean;
  Report_Data:String;
begin
//DisplayDetail  0 - Show all data of all reports
//DisplayDetail  1 - Show Only Changed data of all reports
//DisplayDetail  2 - Show all data only when report changed
//DisplayDetail  3 - Show Only Changed data only when report changed

//  dataString:='';
  Report_Data:='';
  Report_Changed:=False;
  for i:=0 to hidReportData[reportIdx].dataLen-1 do
  begin
    If (hidReportData[reportIdx].hid_data[i]<>hidReportData[reportIdx].hid_data_copy[i]) Then
      Report_Changed:=True;
    If (hidReportData[reportIdx].hid_data[i]=hidReportData[reportIdx].hid_data_copy[i]) And (DisplayDetail And $1 = $1)then
    begin
      //Write('. ,');
      Report_Data+='. ,';
      dataString+='__';
    end
    else
    begin
      //Write(Format('%0.2s,',[hexStr(hidReportData[reportIdx].hid_data[i],2)]));
      Report_Data+=Format('%0.2s,',[hexStr(hidReportData[reportIdx].hid_data[i],2)]);
      dataString+=hexStr(hidReportData[reportIdx].hid_data[i],2)+' ';
      hidReportData[reportIdx].hid_data_copy[i]:=hidReportData[reportIdx].hid_data[i];
    end;
  end;
  If ((DisplayDetail And $2 = $2) and Report_Changed) Or (DisplayDetail And $2 = $0) then
     WriteLn(Report_Data);
  PrintAndCompareReport:=Report_Changed;
end;

function ReportChanged(reportNum:byte):boolean;
var
  i:  Integer;
begin
  result:=false;
  for i:=0 to hidReportData[reportIdx].dataLen-1 do
  begin
    if hidReportData[reportNum].hid_data[i]<>hidReportData[reportNum].hid_data_copy[i] then
    begin
      result:=true;
      exit;
    end;
  end;
end;


end.