is there any function like fopen in vhdl or verilog

[Robin Khosla]

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]

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]

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

 

[TrickyDicky]

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:

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.