DPI再了解（四）

一個簡單的DPI Array Packed case

這個例子是在Cadence的IUS9.2的cdnshelp上所找到的

這是個dynamic array的case

另外所寫的static array的case在Cadence 上測不過

但VCS上似乎可用, static array還要多花一些時間測試

gcc –I/IUS9.2/linux/tools/include/ -shared –o test.so test.c

使用gcc時, 副檔名必須為c

g++ –I/IUS9.2/linux/tools/include/ -shared –o test.so test.cpp

使用g++時, 副檔名必須為cpp

irun_92 main.sv –sv_lib test.so

//test.c

#include <stdio.h>

#include “svdpi.h”

#include <stdlib.h>

void reverse_logic_vec(const svOpenArrayHandle a, const svOpenArrayHandle b) {  

// test.cpp 如果用g++ 就改成下面這一行

// extern “C” void reverse_logic_vec

// (const svOpenArrayHandle a, const svOpenArrayHandle b) {  

// 此處 a 為 input , b為output

        int i;
        int left, right, low, high;

svLogicVecVal *bv1, *bv2, *bv3, *bv4;

bv1 = (svLogicVecVal *) malloc (sizeof(svLogicVecVal) *1);

bv2 = (svLogicVecVal *) malloc (sizeof(svLogicVecVal) *1);

bv3 = (svLogicVecVal *) malloc (sizeof(svLogicVecVal) *1);

bv4 = (svLogicVecVal *) malloc (sizeof(svLogicVecVal) *1);

        svGetLogicArrElem1VecVal(bv1, a, 0); 將array a[0]的值傳給bv1

svGetLogicArrElem1VecVal(bv2, a, 1); 將array a[1]的值傳給bv2

svGetLogicArrElem1VecVal(bv3, a, 2); 將array a[2]的值傳給bv3

svGetLogicArrElem1VecVal(bv4, a, 3);  將array a[3]的值傳給bv4

svPutLogicArrElem1VecVal(b, bv1, 3); 將bv1的值傳給array b[3]

svPutLogicArrElem1VecVal(b, bv2, 2); 將bv2的值傳給array b[2]

svPutLogicArrElem1VecVal(b, bv3, 1); 將bv3的值傳給array b[1]

svPutLogicArrElem1VecVal(b, bv4, 0); 將bv4的值傳給array b[0]

}

module main();
    
          logic [4:1] input_1 [3:0];

          logic [0:3] output_1 [3:0];

           import "DPI-C"  function void reverse_logic_vec (input logic [3:0] i[ ], output logic [3:0] o[ ] );
          
           initial  begin
         input_1[0] = 4’b1111;

             input_1[1] = 4’b0000;

         input_1[2] = 4’bxxxx;

         input_1[3] = 4’bzzzz;

         #5 reverse_logic_vec(input_1, output_1);

         // input_1 對應到C code上的array a,

         // output_1對應到C code上的array b,    

for (int i = 0; i<4 ; i++) begin
                      $display("input[%d] = %b, output[%d] = %b\n ",i, input_1[i], i, output_1[i] );
              end
          
                #5 $finish;            
endmodule

上面有用到svLogicVecVal, 照文件上的說明

svBitVecVal canonical form for 2-state packed arrays 

svLogicVecVal canonical form for 4-state packed arrays