saket Posted April 14, 2016 Report Share Posted April 14, 2016 Hi, I'm trying to use DPI-C to import sin function, but it doesn't work, as a workround i had used a sin approximative function which finally give a static value of 2.5 (the offset value) i think that the instanciation of the sin in the code does not work, and i did not know why, any help would be appreciable: package math_pkg; //import dpi task C Name = SV function name //import "DPI-C" pure function real sin (input real rTheta); `define PI 3.14159265 function real sin; input x; real x; real x1,y,y2,y3,y5,y7,sum,sign; begin sign = 1.0; x1 = x; if (x1<0) begin x1 = -x1; sign = -1.0; end while (x1 > `PI/2.0) begin x1 = x1 - `PI; sign = -1.0*sign; end y = x1*2/`PI; y2 = y*y; y3 = y*y2; y5 = y3*y2; y7 = y5*y2; sum = 1.570794*y - 0.645962*y3 + 0.079692*y5 - 0.004681712*y7; sin = sign*sum; end endfunction // sin endpackage : math_pkg module sv_ams_sin_voltage_gen(output real sine_out); import math_pkg::*; parameter sampling_time = 5; const real pi = 3.1416; real time_us, time_s ; bit sampling_clock; real freq = 20; real offset = 2.5; real ampl = 2.5; always sampling_clock = #(sampling_time) ~sampling_clock; always @(sampling_clock) begin time_us = $time/1000; time_s = time_us/1000000; end assign sine_out = offset + (ampl * sin(2*pi*freq)); endmodule Quote Link to comment Share on other sites More sharing options...
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