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 ContributorHi,
LEDR <= "0101" should be better.... Franck.Honored Contributorand using a 5-bit value should help too
Honored ContributorHonored ContributorYou defined your vectors as 5 bits wide (4 downto 0) so when you assign a value, you should also use 5 bits. "0101" is only 4 bits. You will need to put an extra bit.
Honored Contributortq guys.. i finally able on running my program and the able to get the out from the pir sensor.. guys how can i put a delay to the out of my program.. if there any example that i can refer to. or can i use bad clock program as to put delay at the output...
a newbie in programming..tq for all of your helpHonored ContributorHow long do you want your delay to be? For a one clock cycle delay you can just use a register. If you need more than that you will need a chain of registers.
Honored Contributormr daixiwen
i would like to maintain the output around 1 to 5 minutes. can u give me a quick tutor about this register mr daixiwen.Honored ContributorIf you just need to maintain the output, you can just use a counter. After the output you want to maintain is generated, set the counter to the number of clock cycles you want to hold your value, and decrement it by one on each cycle. When it reaches zero, stop maintaining the value.
Honored ContributorHonored ContributorLibrary IEEE;
use IEEE.STD_LOGIC_SIGNED; use IEEE.STD_LOGIC_UNSIGNED; use ieee.std_logic_1164.all; use IEEE.numeric_std.all; entity ltestinggpiowithdelay is port( GPIO_0 : in std_logic_vector(2 downto 0); CLK : in std_logic; DIN : in std_logic_vector (2 DOWNTO 0); q : out std_logic_vector(2 downto 0)); end ltestinggpiowithdelay ; architecture bufferwithGpio_arc of ltestinggpiowithdelay is begin process(GPIO_0) begin if (GPIO_0(0)='1') then q<=GPIO_0(2 downto 0); else q<= "000"; end if; end process; clk_proc:process(CLK) variable count:std_logic_vector(2 downto 0) := "000"; begin if (CLK'EVENT AND CLK = '1') then if GPIO_0(0) = '1' then count := DIN; else count := "count+1 >"; end if; end if; q <= count after 50 ns; end process clk_proc; end bufferwithGpio_arc; mr daixiwen so my programming is basically to read the input from the PIR sensor and i would like to maintain the output for sometime when the PIR detects movement as to turn on a relay etc. please check whether my programming is correct or not. now when i compile the program it seems a new error stated( object with std_logic type cannot contain character 'C'object with std_logic type cannot contain character 'C').. i am already blank already. please guide me.
