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Altera_Forum's avatar
Altera_Forum
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15 years ago

Up & Down Counter Using Push Buttons

Hi, im trying to implement a counter that counts from 0 to 100 and vise versa. the counter must be controlled using 2 push buttons, one for incrementing and the other for decrementing for examp...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Think about the circuit before thinking about the VHDL.

All you need is a register (one for each button) and a comparitor to compare the registered button press (the old one) and the current one. Assuming you have an active low button: 


--inside clocked process
if button_reg = '1' and button = '0' then  --falling edge detect
  --do something
end if;