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How can i plot raw eeg data

Asked by Venkatesh chowdary on 27 Apr 2019
Latest activity Commented on by dpb
on 27 Apr 2019
I am trying to plot the raw eeg data but i am getting the following error
??? Error using ==> calllib
Library was not found
Error in ==> modReadRaw at 31
dllVersion = calllib('Thinkgear', 'TG_GetDriverVersion');
The code which i have been using is
function raw = modReadRAW
clear all
close all
data = zeros(1,10240); %preallocate buffer
portnum1 = 3; %COM Port #
comPortName1 = sprintf('\\\\.\\COM%d', portnum1);
% Baud rate for use with TG_Connect() and TG_SetBaudrate().
TG_BAUD_57600 = 57600;
% Data format for use with TG_Connect() and TG_SetDataFormat().
TG_STREAM_PACKETS = 0;
% Data type that can be requested from TG_GetValue().
TG_DATA_RAW = 4;
%load thinkgear dll
loadlibrary('Thinkgear.dll');
fprintf('Thinkgear.dll loaded\n');
%get dll version
dllVersion = calllib('Thinkgear', 'TG_GetDriverVersion');
fprintf('ThinkGear DLL version: %d\n', dllVersion );
%%
% Get a connection ID handle to ThinkGear
connectionId1 = calllib('Thinkgear', 'TG_GetNewConnectionId');
if ( connectionId1 < 0 )
error( sprintf( 'ERROR: TG_GetNewConnectionId() returned %d.\n', connectionId1 ) );
end;
% Set/open stream (raw bytes) log file for connection
errCode = calllib('Thinkgear', 'TG_SetStreamLog', connectionId1, 'streamLog.txt' );
if( errCode < 0 )
error( sprintf( 'ERROR: TG_SetStreamLog() returned %d.\n', errCode ) );
end;
% Set/open data (ThinkGear values) log file for connection
errCode = calllib('Thinkgear', 'TG_SetDataLog', connectionId1, 'dataLog.txt' );
if( errCode < 0 )
error('ERROR: TG_SetDataLog() returned %d.\n', errCode );
end;
% Attempt to connect the connection ID handle to serial port "COM3"
errCode = calllib('Thinkgear', 'TG_Connect', connectionId1,comPortName1,TG_BAUD_57600,TG_STREAM_PACKETS );
if ( errCode < 0 )
error( 'ERROR: TG_Connect() returned %d.\n', errCode );
end
fprintf( 'Connected. Reading Packets...\n' );
%%
%record data
j = 0;
i = 0;
while (i < 10240) %loop for 20 seconds
if (calllib('Thinkgear','TG_ReadPackets',connectionId1,1) == 1) %if a packet was read...
if (calllib('Thinkgear','TG_GetValueStatus',connectionId1,TG_DATA_RAW) ~= 0) %if RAW has been updated
j = j + 1;
i = i + 1;
data(j) = calllib('Thinkgear','TG_GetValue',connectionId1,TG_DATA_RAW);
total(i) = calllib('Thinkgear','TG_GetValue',connectionId1,TG_DATA_RAW);
end
end
if (j == 256)
modPlotRAW(data); %plot the data, update every .5 seconds (256 points)
j = 0;
end
end
raw = total; %return value of data
%disconnect
calllib('Thinkgear', 'TG_FreeConnection', connectionId1 );

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1 Answers

Answer by dpb
on 27 Apr 2019

You have to load the library first...see the example code in the documenation for checking...use your wanted library name, path of course...
if ~libisloaded('shrlibsample')
addpath(fullfile(matlabroot,'extern','examples','shrlib'))
loadlibrary('shrlibsample')
end

  2 Comments

Sorry i am new to this can you be little more specific about how i can solve my problem
dpb
on 27 Apr 2019
Load your wanted library...you'll need to know where, specifically, it was installed...we can't tell you that.

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