Reading file using $fscanf

Guest
I have problem in reading the file using $fscanf system function.
I am trying to read the read_pattern.txt file using $fscanf and
displaying the contents of the file.

read_pattern.txt is like this

101 100 25
110 111 32

The source code is
`define NULL 0
`define EOF 32'hFFFF_FFFF
module read_pattern;
integer c, r;
reg [2:0] bin1,bin2;
reg [8*10:1] str;
integer int,line;
integer file;
//reg [8*`MAX_LINE_LENGTH:0] line; /* Line of text read from file */

initial
begin : file_block
$display("Bin1 Bin2 Int");
file = $fopen("read_pattern.txt","r");
if (file == `NULL) // If error opening file
disable file_block; // Just quit

r = 1;
while (r!==0)
begin
r = $fscanf(file," %b %b %d ", bin1,bin2,int);
$display ("Bin1 = %b Bin2 = %b Int = %d\n",bin1,bin2,int);
end // while not EOF
$system("cp read_pattern.txt output.log");
$fclose(file);
$finish;
end // initial
endmodule // read_pattern

When i invoke simulation command it is not stopping after displaying
the 2 lines.
The last line contents are continuosly displaying the with out exiting
the while loop.
Please explain why it is not exiting the while loop.

The simulation output is like this.
Bin1 = 101 Bin2 = 100 Int =25
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
.......................
Regards
Vishnu
 
On Oct 8, 1:13 am, vishnuprasa...@gmail.com wrote:
I have problem in reading the file using $fscanf system function.
I am trying to read the read_pattern.txt file using $fscanf and
displaying the contents of the file.

read_pattern.txt is like this

101 100 25
110 111 32

The source code is
`define NULL 0
`define EOF 32'hFFFF_FFFF
module read_pattern;
integer c, r;
reg [2:0] bin1,bin2;
reg [8*10:1] str;
integer int,line;
integer file;
//reg [8*`MAX_LINE_LENGTH:0] line; /* Line of text read from file */

initial
begin : file_block
$display("Bin1 Bin2 Int");
file = $fopen("read_pattern.txt","r");
if (file == `NULL) // If error opening file
disable file_block; // Just quit

r = 1;
while (r!==0)
begin
r = $fscanf(file," %b %b %d ", bin1,bin2,int);
$display ("Bin1 = %b Bin2 = %b Int = %d\n",bin1,bin2,int);
end // while not EOF
$system("cp read_pattern.txt output.log");
$fclose(file);
$finish;
end // initial
endmodule // read_pattern

When i invoke simulation command it is not stopping after displaying
the 2 lines.
The last line contents are continuosly displaying the with out exiting
the while loop.
Please explain why it is not exiting the while loop.

The simulation output is like this.
Bin1 = 101 Bin2 = 100 Int =25
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
......................
Regards
Vishnu
Click to expand...

try:

.. . .

r = 3;
while (r==3)

.. . .

It seems that EOF returns -1 rather than zero in "r".
Also note that even with the code above, you'll get
one extra repetition of your last line printed, since
the loop executes before "r" is checked.

Cheers,
Gabor
 
On Oct 8, 9:41 am, gabor <ga...@alacron.com> wrote:
On Oct 8, 1:13 am, vishnuprasa...@gmail.com wrote:



I have problem in reading the file using $fscanf system function.
I am trying to read the read_pattern.txt file using $fscanf and
displaying the contents of the file.

read_pattern.txt is like this

101 100 25
110 111 32

The source code is
`define NULL 0
`define EOF 32'hFFFF_FFFF
module read_pattern;
integer c, r;
reg [2:0] bin1,bin2;
reg [8*10:1] str;
integer int,line;
integer file;
//reg [8*`MAX_LINE_LENGTH:0] line; /* Line of text read from file */

initial
begin : file_block
$display("Bin1 Bin2 Int");
file = $fopen("read_pattern.txt","r");
if (file == `NULL) // If error opening file
disable file_block; // Just quit

r = 1;
while (r!==0)
begin
r = $fscanf(file," %b %b %d ", bin1,bin2,int);
$display ("Bin1 = %b Bin2 = %b Int = %d\n",bin1,bin2,int);
end // while not EOF
$system("cp read_pattern.txt output.log");
$fclose(file);
$finish;
end // initial
endmodule // read_pattern

When i invoke simulation command it is not stopping after displaying
the 2 lines.
The last line contents are continuosly displaying the with out exiting
the while loop.
Please explain why it is not exiting the while loop.

The simulation output is like this.
Bin1 = 101 Bin2 = 100 Int =25
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
......................
Regards
Vishnu

try:

. . .

r = 3;
while (r==3)

. . .

It seems that EOF returns -1 rather than zero in "r".
Also note that even with the code above, you'll get
one extra repetition of your last line printed, since
the loop executes before "r" is checked.

Cheers,
Gabor
Click to expand...

Another point... It seems that $fscanf is not line oriented
(I think this was also true in "C" as well). So even if you
add empty lines at the end of your file, the last scan will
eat all of the whitespace to the end of file and still return
-1 instead of 0.
 
On Oct 8, 6:49 pm, gabor <ga...@alacron.com> wrote:
On Oct 8, 9:41 am, gabor <ga...@alacron.com> wrote:



On Oct 8, 1:13 am, vishnuprasa...@gmail.com wrote:

I have problem in reading the file using $fscanf system function.
I am trying to read the read_pattern.txt file using $fscanf and
displaying the contents of the file.

read_pattern.txt is like this

101 100 25
110 111 32

The source code is
`define NULL 0
`define EOF 32'hFFFF_FFFF
module read_pattern;
integer c, r;
reg [2:0] bin1,bin2;
reg [8*10:1] str;
integer int,line;
integer file;
//reg [8*`MAX_LINE_LENGTH:0] line; /* Line of text read from file */

initial
begin : file_block
$display("Bin1 Bin2 Int");
file = $fopen("read_pattern.txt","r");
if (file == `NULL) // If error opening file
disable file_block; // Just quit

r = 1;
while (r!==0)
begin
r = $fscanf(file," %b %b %d ", bin1,bin2,int);
$display ("Bin1 = %b Bin2 = %b Int = %d\n",bin1,bin2,int);
end // while not EOF
$system("cp read_pattern.txt output.log");
$fclose(file);
$finish;
end // initial
endmodule // read_pattern

When i invoke simulation command it is not stopping after displaying
the 2 lines.
The last line contents are continuosly displaying the with out exiting
the while loop.
Please explain why it is not exiting the while loop.

The simulation output is like this.
Bin1 = 101 Bin2 = 100 Int =25
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
Bin1 = 110 Bin2 = 111 Int =32
......................
Regards
Vishnu

try:

. . .

r = 3;
while (r==3)

. . .

It seems that EOF returns -1 rather than zero in "r".
Also note that even with the code above, you'll get
one extra repetition of your last line printed, since
the loop executes before "r" is checked.

Cheers,
Gabor

Another point... It seems that $fscanf is not line oriented
(I think this was also true in "C" as well). So even if you
add empty lines at the end of your file, the last scan will
eat all of the whitespace to the end of file and still return
-1 instead of 0.
Click to expand...
Thankyou i got it
 
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