HELLLP about DPI coding

Altera_Forum · ‎05-30-2017

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 ??

Altera_Forum · ‎05-30-2017

DPI is for simulation, not for synthesis.

Altera_Forum · ‎05-31-2017

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DPI is for simulation, not for synthesis.

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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 · ‎05-31-2017

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

Altera_Forum · ‎05-31-2017

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

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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 · ‎05-31-2017

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/