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Altera_Forum's avatar
Altera_Forum
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15 years ago

DE2 push buttons question

I have a simple counter in VHDL for DE2-115 (should work with any DE2). KEY0 starts counting, KEY1 stops, KEY2 resets. The output is displayed on 7-seg LEDs HEX0 - HEX3 in hexa digits (to be simple m...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

... I was investigating where should be the the problem but I am still confused :confused:.

I have tried detection of KEY's falling edge (KEY is pressed) and I think it was ~70% successful; else there was detected KEY's release instead of press or it was detected press and release (during one push). Shouldn't be there a problem with voltage setting (there is 2.5V in pin planner) or some voltage bouncing during the falling/rising edge ? I have any other explanation ...

I have also upgraded Quartus from 9.1sp2 to 10.1 but there is no difference.