Using SUB-20 .NET interface in Matlab

All about SUB-20 Multi Interface USB Adapter USB to I2C, SPI, GPIO, RS232, RS485, Ir, LCD

Moderator: serg

Using SUB-20 .NET interface in Matlab

Postby serg » Tue Oct 13, 2009 11:34 am

Example of reading CH1 of the SUB-20 ADC
Tested with the Matlab R2009a

%---------------------------------------------------------------

disp 'SUB-20 ADC sample. Read 16 samples from CH1'

SamplesToRead = 16;

NET.addAssembly('C:\Program Files\SUB-20\bin\sub20dnc.dll');

sub20 = Xdimax.Sub20();

% simulate do { ... } while(0) loop
for k=0:0

% Open first available SUB-20 device
if ~ sub20.Open(0)
break;
end

% Enable the ADC and set Vref=Vcc
if ~ sub20.ADC_SetConfig(sub20.AdcEnable+sub20.AdcRefVcc)
break;
end


% Create .NET arrays
Data = NET.createArray('System.Int32', SamplesToRead);
Mux = NET.createArray('System.Int32', SamplesToRead);

% Setup Mux array to CH1
for i=0:(SamplesToRead-1)
Mux.Set(i,1);
end

% ADC read
if ~ sub20.ADC_Read(Data, Mux)
break;
end

vref = 5.0;

Samples=zeros(1, SamplesToRead);
% Convert ADC samples to Volts
for i=1:SamplesToRead
Samples(i)= ( double(Data.Get(i-1)) * vref ) /1023 ;
end
end

err = sub20.GetLastError();

% Close SUB-20 device
sub20.Close()

if err > 0
fprintf('Error %d\n', err )
error('Error!')
end
serg
 
Posts: 136
Joined: Mon Aug 31, 2009 9:17 pm

Re: Using SUB-20 .NET interface in Matlab

Postby cmaz » Mon Mar 29, 2010 8:04 pm

I'm trying to perform the GPIO functions in Matlab 2009a but seem to be having a bit of trouble. Following your example code

NET.addAssembly('C:\Program Files\SUB-20\bin\sub20dnc.dll');
sub20 = Xdimax.Sub20();

Data = NET.createArray('System.Int32', 1);

===================

sub20.GPIO_Read(Data)
??? No method 'GPIO_Read' with matching signature found for class 'Xdimax.Sub20'.

=====================
I also have a similar problem with the GPIO_Write.

Should I not be using an Int32 for the GPIO_Read and GPIO_Write functions?

I am able to use other methods like the SPI_Write and others.

Any help would be appreciated.

Thanks
cmaz
 
Posts: 1
Joined: Mon Mar 29, 2010 7:45 pm

Re: Using SUB-20 .NET interface in Matlab

Postby serg » Thu Apr 01, 2010 3:16 am

Here you go

%-----------------------------------------------------------------------------------------------------------
% This sample code demonstarates accessing the SUB-20 GPIO pins

NET.addAssembly('C:\Program Files\SUB-20\bin\sub20dnc.dll');

sub20 = Xdimax.Sub20();

% simulate do { ... } while(0) loop
for k=0:0

% Open first available SUB-20 device
if ~ sub20.Open(0)
break;
end

% Create a bitmask for GPIO12
bit_mask=int32(bitshift(1, 12));

% Configure GPIO12 as an output
if ~ sub20.GPIO_SetConfig(bit_mask, bit_mask)
break;
end

% Set GPIO12 to logical '1'
if ~ sub20.GPIO_Write(bit_mask, bit_mask)
break;
end

% Set GPIO12 to logical '0'
if ~ sub20.GPIO_Write(0, bit_mask)
break;
end

% Read all input pins to the 'val' variable
[success val] = sub20.GPIO_Read(0) ;
if ~ success
break;
end

bits = dec2hex(uint32(val));

end

err = sub20.GetLastError();

% Close SUB-20 device
sub20.Close()

if err > 0
fprintf('Error %d\n', sub20.GetLastError() )
error('Error!')
end

%-----------------------------------------------------------------------------------------------------------
serg
 
Posts: 136
Joined: Mon Aug 31, 2009 9:17 pm


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