Vhdl Binary To Integer Converter
Description How do I convert STDLOGICVECTOR to Integer in 'VHDL - Tips and Tricks'? Type conversion is a regular operation that is performed while writing VHDL code, but it can sometimes be cumbersome to perform properly. Will work as follows: The integer expression timeIn.340/2 will be evaluated at simulation time / at run-time, then converted to unsigned while truncating the binary representation to convint'length bits, and finally converting this to stdlogicvector.
I can print an integer as decimal to stdout with:
which outputs:
But how to output instead either:
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Assuming an integer i, and VHDL-2008, you could use:
You need to have use std.textio.all; for this to work. Change the 32 to reduce the length of the hex value. I chose 32 so that it can represent any integer value in most simulators.
These will also work for report statements, e.g.
There is no standard library implementation, but for example our PoC-Libary has several formatting function in the PoC.Strings package. On top of that, we have a to_string(...) function, which accepts a format character like h for hexadecimal outputs.
How to write such an integer to hex conversion?
- Convert the INTEGER into a binary representation
- Group the binary value into 4-bit groups
- translate each group into an integer/alpha in range 0..F
- prepend
0xif wished
So here is a wrapper to convert the integer to a binary representation:
And now the grouping and transformation
Note: These functions do not prepend 0x.
Decimal To Binary Converter
PaebbelsYou could use the hwrite procedure in the IEEE.std_logic_textio package:
The hwrite procedure writes a std_logic_vector to a file. So, you do have to convert your integer into a std_logic_vector, however (which also needs you to specify a number of bits in the to_unsigned function).