用FPGA来跑ARM 核的时候，刚开始将Keil编译产生的hex文件拿来仿真和下到板子上的时候，发现程序运行不正确。细细观察仿真波形发现，在Altera的ROM IP中直接调用Keil产生的hex文件，出来数据是不正确的。比较Quartus产生的HEX文件和标准的Hex文件，发现两者之间的格式不是完全一样。于是干脆直接将Keil产生的Hex文件转换成mif文件。
代码是用verilog写的，已调试通过，ARM核也运行正常。由于没有判断
Extended LinearAddress Record
，该程序只能转换小于64Kbyte的hex文件。
hex转mif代码如下。
//-----------------------------------------------------------------
// Author: wuzhangquan
// Blog: http://www.cnblogs.com/xinlukk/
// Email: wuzhangquan@foxmail.com
//-----------------------------------------------------------------
//: 10 0000 00 F0FF0F20 B9010000 B1010000 AD010000 B8
`timescale 1ns/1ns
module hex2mif;
parameter MEM_DEPTH = 16*1024;
integer fid;
integer i;
integer tf;
reg [7:0] ch;
reg [7:0] len;
reg [15:0] ext_addr;
reg [15:0] addr;
reg [7:0] dtype;
reg [7:0] data;
reg [7:0] mem[0:MEM_DEPTH-1];
initial begin
ch = 0;
ext_addr = 0;
addr = 0;
dtype = 0;
data = 0;
for(i=0;i<MEM_DEPTH;i++)
mem[i] = 0;
fid=$fopen("rom.hex","rb");
if(fid==0) begin
$display("Cann't find rom.hex!!");
$finish;
ch = $fgetc(fid);
while(ch!=8'hff)
begin
//$write("%c",ch);
if(ch==":")
begin
ch = $fgetc(fid);
len[7:4] = asc2hex(ch);
ch = $fgetc(fid);
len[3:0] = asc2hex(ch);
//Get Addr
ch = $fgetc(fid);
addr[15:12] = asc2hex(ch);
ch = $fgetc(fid);
addr[11:8] = asc2hex(ch);
ch = $fgetc(fid);
addr[7:4] = asc2hex(ch);
ch = $fgetc(fid);
addr[3:0] = asc2hex(ch);
//get Data type
ch = $fgetc(fid);
dtype[7:4] = asc2hex(ch);
ch = $fgetc(fid);
dtype[3:0] = asc2hex(ch);
//DATA
if(dtype==8'h00) begin //Data
for(i=0;i<len;i++) begin
ch = $fgetc(fid);
data[7:4] = asc2hex(ch);
ch = $fgetc(fid);
data[3:0] = asc2hex(ch);
mem[ext_addr + addr] = data;
addr = addr + 1;
$fwrite(tf,"%h",data);
len = 0;
//CHECK
//ch = $fgetc(fid);
//ch = $fgetc(fid);
ch = $fgetc(fid);
end //while end
$fclose(fid);
fid = $fopen("rom.mif","w");
$fdisplay(fid,"WIDTH=32;");
$fdisplay(fid,"DEPTH=4096;");
$fdisplay(fid,"ADDRESS_RADIX=HEX;");
$fdisplay(fid,"DATA_RADIX=HEX;");
$fdisplay(fid,"CONTENT BEGIN");
for(i=0;i<(MEM_DEPTH/4);i=i+1)
$fdisplay(fid,"%h : %h%h%h%h;",i,mem[i*4+3],mem[i*4+2],mem[i*4+1],mem[i*4]);
$fdisplay(fid,"END;");
$fclose(fid);
// fid = $fopen("rom.txt","w");
// for(i=0;i<(MEM_DEPTH/4);i=i+1)
// $fdisplay(fid,"%h%h%h%h",mem[i*4+3],mem[i*4+2],mem[i*4+1],mem[i*4]);
// $fclose(fid);
function [3:0] asc2hex;
input [7:0] din;
begin
if(din<="9") asc2hex = din - "0";
else if( (din>="A") && (din<="F")) asc2hex = din - "A" + 4'ha;
else if( (din>="a") && (din<="f")) asc2hex = din - "a" + 4'ha;
else asc2hex = 0;
endfunction
endmodule
