MATLAB: How to change the number of input/output-terminals based on mask parameter

input/output terminalmasksimulink

I’m now writing a custom driver for Simulink Real-time and have a question about how to change the number of input/output-terminals. I want to change the number of the terminals by setting the mask parameter “channel” like pre-installed drivers, e.g. MM-32 Diamond Analog Input or PCI-6621 National Instr. Analog Input.
I started to write the driver using “xpcdrivertool” and added initialization function (below) using these pre-installed drivers as examples.
function [maskdisplay]  = init(channel)
maskdisplay = sprintf( 'disp(''Interface Baord'');' );
for i=1:length(channel)
    maskdisplay = sprintf('%s port_label(''output'', %d, ''%d'');', maskdisplay, i, channel(i) );
end
In the mask editor of the driver block, I added ‘channel’ parameter and wrote an initialization command as follows.
[maskDisplay] = init(channel);
set_param(gcb, 'MaskDisplay', maskDisplay);
Also, I’m changing the number of terminals in the initialization function in C code as follows.
if (!ssSetNumOutputPorts(S, number_of_channels)) return;
for (i = 0; i <  number_of_channels; i++) {
 ssSetOutputPortWidth(S, i, 1);
}
However, the number of terminals does not change in the block diagram. Can someone please help me out?

Best Answer

Hi Teppei,
The following link could help you in resolving this issue:
http://www.mathworks.com/matlabcentral/answers/30433-dynamically-change-the-number-of-ports-of-a-block
The “xpcdrivertool” seems to be from MATLAB Central, so it might also help to contact the author directly.
Hope this helps!
-Shruti
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