Honored ContributorHi guys im very new in VHDL and im trying to write a program as to turn on an LED from the GPIO_0 which i put a PIR sensor to it..the PIR sensor is directly connectted to GPIO_O(0).. so the problem is that when i run the program some error show up and i havent have any idea how to correct it back. please help me guys..
:):):)
Honored ContributorThere are several problems here. I would suggest to read a book or an online course on VHDL first.
use IEEE.STD_LOGIC_SIGNED;
use IEEE.STD_LOGIC_UNSIGNED;
use ieee.std_logic_1164.all;
use IEEE.numeric_std.all;variable count:std_logic_vector(2 downto 0) := "000";count := DIN;count := unsigned(DIN);count := "count+1 >";count := count+1;hm base on your explanation mr daixiwen how should i program my counter so that the output can hold at any time. how about some example or tutorial that i can refer to..tq mr daixiwen
Honored ContributorI don't know any example or tutorial about this subject, it is a rather trivial VHDL construction. Just have a counter value that you increase or decrease and do something when it reaches a predetermined value.
Honored Contributori am creating a program tO TURN ON LED USINg switches from the de2 board. the problem is the program runs without errror just warning. and while i test it on my de2 board it doesnot goes as plan. so for my program is there is 3 switch the first switch must be turn on and the led will turn on, the second switch will turn on the second led and the 3rdrn on both switch also will turn the 3 led.. i wanted the first switch to be the main controller.. if the first switch does not turn switch 2 and 3 cannot turn on the led.. but when i try runn it with my de2 it doesnot work that way. only 1 led turn on.. i have set the pin assignment correctly..really need some advice on sloving this tq in advance
entity Mux is port( A_bus : in std_logic_vector(2 downto 0); output : out std_logic_vector(2 downto 0)); end Mux; architecture arc_nnmux of Mux is begin process(A_bus) begin if A_bus <= (2=>'0',1=> '0', 0=>'1')then output <="001"; elsif A_bus <=(2=>'0',1=>'1',0=>'1')then output <="011"; elsif A_bus <=(2=>'1',1=>'1',0=>'1')then output <="111"; else output<= "000"; end if; end process; end arc_nnmux;Honored ContributorYou code is rather confusing. Instead of using the <= operator I think it would be a lot easier to check individual bits of A_bus in your ifs. It would make the priority order more visible.
What do you call "first switch"? Is it the one connected to A_bus(0) or A_bus(2)? Did you check the polarity of the switch and led signals?
