how pulse generation can be integrated with trigger block ?

Hi, I generated pulse by using below code and now I want to trigger my sampler on every rising edge but the trigger subsystem is not getting trigger even there is change in the pulse value from -1 to 1 or 1 to -1. could anyone please know how I can integrate the pulse block with trigger subsystem ? This trigger block is working when I use ideal clock generation but here I generated my own clock using square function but the trigger subsystem is not working here. I attached snap .

function y = pulse

coder.extrinsic('square')

persistent sq;

persistent i;

if isempty(sq) % Initialization sq=0; end

if isempty(i) % Initialization i=1; end

fs = 10000;

t=0:1/fs:0.1;

f = 100;

while (i<1000)

    sq = square(2*pi*f*t(i),40)';

    i=i+40;

    break;

end

y=sq;

Please help me.

Thanks