Hello.
I am trying to make a simple UP/DOWN counter and I am fairly new to VHDL. I keep getting the following error
"Error (10327): VHDL error at Counter.vhd(51): can't determine definition of operator ""+"" -- found 0 possible definitions"
My code is
It is starting tio get a bit annoying now, I have tried loads of things I read online but to no avail.
Any help would be hugely appreciated.
I am trying to make a simple UP/DOWN counter and I am fairly new to VHDL. I keep getting the following error
"Error (10327): VHDL error at Counter.vhd(51): can't determine definition of operator ""+"" -- found 0 possible definitions"
My code is
Code:
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity counter is
generic
(
startnum : natural := 0;
N : natural := 16
);
port
(
--Inputs
EN : in std_logic;
synchr : in std_logic;
asyncr : in std_logic;
dir : in std_logic; --0 for count down 1 for count up.
clk : in std_logic;
--Outputs
Y : out natural range startnum to n-1
);
end entity;
architecture counter_v1 of counter is
signal cntconst : integer;
begin
process (dir) --dir in sensitivity list as when this changes we want this process to run.
begin
if (dir = '0') then
cntconst <= -1; --this will count down when added onto to the counter value
end if;
if (dir = '1') then
cntconst <= 1;
end if;
end process;
process (EN, synchr, asyncr, clk)
variable notsurewhyitworkswiththis : integer range startnum to n-1; --I tried to just use y but for some reason it won't allow that.
begin
if (en = '0') then
else
if (asyncr = '1') then
notsurewhyitworkswiththis := 0;
else
if (clk = '1') then
if (synchr = '1') then
notsurewhyitworkswiththis := 0;
end if;
end if;
end if;
if (cntconst < n-1) then
if (dir = '1') then
notsurewhyitworkswiththis := notsurewhyitworkswiththis + dir;
end if;
end if;
if (cntconst > startnum) then
if (dir = '0') then
notsurewhyitworkswiththis := notsurewhyitworkswiththis + dir;
end if;
end if;
end if;
y <= cntconst;
end process;
end counter_v1;Any help would be hugely appreciated.