is there any function like fopen in vhdl or verilog

Robin Khosla · Jan 14, 2013

hii,

i want to create a bmp image using vhdl and then store it in pc so that i can watch the image

i know there is textio library in vhdl but it creates .txt files. How can i create bmp file?

is there any function like fopen in vhdl or verilog?

krishna2728 · Jan 14, 2013

Ya there is Please look into the following links

http://verilog.renerta.com/mobile/source/vrg00016.htm

http://www.asic-world.com/verilog/verilog2k3.html

**broken link removed**

http://www.asic.co.in/Index_files/verilog_files/File_IO.htm

naught · Jan 14, 2013

https://parallelpoints.com/reading-image-files-with-vhdl-part-1-again/
I haven`t finished reading it yet, but it might be useful.

TrickyDicky · Jan 14, 2013

Writing data in and out of VHDL is technically possible, but how it works will depend on what similator you are using.
Luckily, modelsim/questa allows you access each byte of a file via chars. You need to declare a file of type character:

type char_file_t is file of character;

and then you can read and write to using the in built read/write functions for all types:

Code:

variable c_buf : character;
file my_file : char_file_t;

....
FILE_OPEN("somefile.bmp");

read(my_file, c_buf);

--do something with the char, like convert it to an integer with character'pos(c_buf)

Remember that BITMAPs have a specified header format, so you will have to read about all the fields in the header, which you will have to read and decode in your VHDL code.

is there any function like fopen in vhdl or verilog

Robin Khosla

Member level 4

krishna2728

Member level 5

naught

Member level 3

TrickyDicky

Advanced Member level 7

Similar threads

is there any function like fopen in vhdl or verilog

Robin Khosla

Member level 4

krishna2728

Member level 5

naught

Member level 3

TrickyDicky

Advanced Member level 7

Similar threads

Privacy & Transparency

Privacy & Transparency