Why does TG_Connect() return -2
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I am currently attempting to connect my NeuroSky Mindwave Mobile 2 to matlab, via the readRaw function provided by neurosky. It works ~1 in 20 times and most of the time returns a value of -2, meaning there were no bytes available to read from the headset. I have tried resetting the COM port, but to no avail.
function readRAW
function readRAW
%run this function to connect and plot raw EEG data
%make sure to change portnum1 to the appropriate COM port
clear all
close all
data = zeros(1,256); %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','thinkgear.h');
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( sprintf( '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( sprintf( '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('thinkgear64','TG_ReadPackets',connectionId1,1) == 1) %if a packet was read...
if (calllib('thinkgear64','TG_GetValueStatus',connectionId1,TG_DATA_RAW) ~= 0) %if RAW has been updated
j = j + 1;
i = i + 1;
data(j) = calllib('thinkgear64','TG_GetValue',connectionId1,TG_DATA_RAW);
end
end
if (j == 256)
plotRAW(data); %plot the data, update every .5 seconds (256 points)
j = 0;
end
end
%disconnect
calllib('thinkgear64', 'TG_FreeConnection', connectionId1 );
Error Message:
Error using readRAW (line 57)
ERROR: TG_Connect() returned -2.
2 个评论
Amer Basem
2021-6-4
Hello sir I'm facing the same problem Did you find the solution? Help me please Thank you
Walter Roberson
2021-6-4
Error -2 is access unavailable. Some of the potential causes are listed below in https://www.mathworks.com/matlabcentral/answers/765506-why-does-tg_connect-return-2#answer_641371
回答（1 个）
Walter Roberson
2021-3-7
编辑：Walter Roberson
2021-3-8
0 个投票
No, -2 indicates that the device could not be connected to:
- the device might be in use by a different program
- the device might be in use from a previous run where the program stopped before closing
- sometimes drivers get stuck
- the device might not be turned on
- cable might be unplugged
- cable might be faulty
2 个评论
Ewan Harrison
2021-3-8
Walter Roberson
2021-3-8
delete(instrfind('type', 'serial'))
would be more focused, but if what you had did not work then this will not work either.
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2021-3-7
2021-6-4
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