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Altera_Forum
Honored Contributor I
990 Views

HELLLP about DPI coding

Try to make a function generator by using DPI sin functions from C, however, error occurred  

this is my whole sv code 

 

package math_pkg; 

//import dpi task C Name = SV function name 

 

import "DPI-C" pure function real cos (input real rTheta); 

import "DPI-C" pure function real sin (input real rTheta); 

import "DPI-C" pure function real log (input real rVal); 

import "DPI-C" pure function real log10 (input real rVal); 

endpackage : math_pkg 

 

 

 

 

 

Error (10170): Verilog HDL syntax error at math_pkg.sv(3) near text ""DPI-C"; expecting an identifier 

what the heck is going on dude ??
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5 Replies
Altera_Forum
Honored Contributor I
134 Views

DPI is for simulation, not for synthesis.

Altera_Forum
Honored Contributor I
134 Views

 

--- Quote Start ---  

DPI is for simulation, not for synthesis. 

--- Quote End ---  

 

 

Thank you for replying  

I wonder why this is synthesis not simulation 

Is there a way that I can use sine functions for synthesis in fpga? 

then how to create a function generator with C languages ? 

thankyou!
Altera_Forum
Honored Contributor I
134 Views

Altera_Forum
Honored Contributor I
134 Views

 

--- Quote Start ---  

https://pdfs.semanticscholar.org/f523/c638e72ce7a9b068470510ba54d23bf715fb.pdf 

--- Quote End ---  

 

Thank you so much! this helps me a lot! , :) 

Can I also ask a question the input/output declaration for a module?  

for example  

module slc3( 

input logic [15:0] S, 

input logic Clk, Reset, Run, Continue, 

output logic [11:0] LED, 

output logic [6:0] HEX0, HEX1, HEX2, HEX3, 

output logic CE, UB, LB, OE, WE, 

output logic [19:0] ADDR, 

inout wire [15:0] Data //tristate buffers need to be of type wire 

); 

i see that all the input output are calculated in a binary form, 

 

 

However , the input from the article suggestests a fraction number(like 0.45) 

https://alteraforum.com/forum/attachment.php?attachmentid=13710&stc=1  

if the result from sine wave is, for example, -0.52, should i express this in binary for the module 's output? and datatype of the output be like?(logic, real....) thanks!
Altera_Forum
Honored Contributor I
134 Views

I see you have a lot to learn about designing digital hardware. Everything in hardware binary. https://sestevenson.wordpress.com/introduction-to-fixed-point-representation/

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