hex文件读取任务和应用实例(systemverilog)

用于初始化存储器，省的再用工具进行hex->bin转换，自己改写的,出了什么问题还请各位指教
`define rom_size 16'hffff
module irom64kx8(
input[15:0] irom_addr,
inputirom_rd_n,
inputirom_cs_n,
output reg [7:0] irom_data_out
);
logic [7:0] rom_data[`rom_size];
logic [7:0] temp;
int i=0;
int h_mt;
initial begin
read_hex_file("../soft/main.hex",rom_data);
end
always @(*) begin
irom_data_out<=((~irom_rd_n) && (~irom_cs_n))? rom_data[irom_addr]:8'bZ;
end
task read_hex_file(input string file_name , output [7:0] rom_data[`rom_size]);
logic [7:0]column;
logic [15:0] address;
logic [7:0] len;
logic [7:0] dat;
logic [7:0] check_sum;
int i,fd,code;
//initial all data with zero
foreach(rom_data)
rom_data=0;

fd=$fopen(file_name,"r");
if(fd==0) begin
$display("hex file not found,please check file path and file name！");
$stop;// stop when no such file
end
while(~$feof(fd)) begin
//find ":" at the beginning of a record
while(1) begin
if($feof(fd))begin
$fclose(fd);
return;
end

column=$fgetc(fd);
if(column==":") break;// every line begin with ":" int the IntelHex form
end


code=$fscanf(fd,"%2x",len);
if(len==0) return;// stop when no data

check_sum=len;
code=$fscanf(fd,"%4x",address);
check_sum=check_sum+address;
check_sum=check_sum+(address>>8);// unsigned check_sum
code=$fscanf(fd,"%2x",dat);// data type
check_sum=check_sum+dat;


for(i=0;i<len;i=i+1) begin
code=$fscanf(fd,"%2x",dat);
check_sum=check_sum+dat;
rom_data[address]=dat;// rom_data read data from file
//$display("rom_data[%6d]=%2h",address,dat);
address=address+1;
end

code=$fscanf(fd,"%2x",dat);// check data
check_sum=check_sum+dat;

if(check_sum！=0) begin
$display("hex file error:checkcheck_sum is not zero！");
$stop;
end
end
endtask:read_hex_file
endmodule

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有必要那么复杂吗?直接调用$readmemh不行吗