Forum Discussion
[VHDL] Help with "stuck at VCC"
I need to make an output pulse (within certain conditions) becomes a '1' constant (in an LED).I was able to code, but the output is stuck at VCC. I do not know how to fix this. Can anyone help me please?Code:ARCHITECTURE behavioral OF check_minutes IS SIGNAL aux: STD_LOGIC := '0';BEGIN accept_minutes: PROCESS(enable,data) --processo de aceitar ou não a temperatura inserida. BEGIN IF(data>="000001" AND data<="111011" AND enable='1') THEN aux <= '1'; END IF; END PROCESS accept_minutes; minled <= aux;END ARCHITECTURE behavioral;
7 Replies
- Altera_Forum
Honored Contributor
--- Quote Start --- I need to make an output pulse (within certain conditions) becomes a '1' constant (in an LED).I was able to code, but the output is stuck at VCC. I do not know how to fix this. Can anyone help me please?Code:ARCHITECTURE behavioral OF check_minutes IS SIGNAL aux: STD_LOGIC := '0';BEGIN accept_minutes: PROCESS(enable,data) --processo de aceitar ou não a temperatura inserida. BEGIN IF(data>="000001" AND data<="111011" AND enable='1') THEN aux <= '1'; END IF; END PROCESS accept_minutes; minled <= aux;END ARCHITECTURE behavioral; --- Quote End --- you just need to define when aux should be '0'; e.g. aux <= '0'; if...your decision - Altera_Forum
Honored Contributor
Can u edit the code and send please? I didn't understand what u teling
- Altera_Forum
Honored Contributor
and enjoy the LED light.ARCHITECTURE behavioral OF check_minutes IS SIGNAL aux: STD_LOGIC := '0'; BEGIN accept_minutes: PROCESS(enable,data) --processo de aceitar ou não a temperatura inserida. BEGIN IF(data>="000001" AND data<="111011" AND enable='1') THEN aux <= '1'; else aux <= '0'; END IF; END PROCESS accept_minutes; minled <= aux; END ARCHITECTURE behavioral; - Altera_Forum
Honored Contributor
In this case, when the 'enable' stop being '1' the led turns off. And this is wrong, cause the user will not press "enable" button forever.
I want if the output is '1' once is forever; regardless of the value of the enable. - Altera_Forum
Honored Contributor
look at the simulation.
http://embdev.net/attachment/269124/case_1.png - Altera_Forum
Honored Contributor
--- Quote Start --- In this case, when the 'enable' stop being '1' the led turns off. And this is wrong, cause the user will not press "enable" button forever. I want if the output is '1' once is forever; regardless of the value of the enable. --- Quote End --- You either change enable to a toggle switch instead of current button or learn how to keep enable high internally using clock edge ...etc. and hopefully LED wouldn't burn - Altera_Forum
Honored Contributor
omg, thank u! toggle switch is better.