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Altera_Forum
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17 years ago

Has anyone driven the 7-segment displays on the Cyclone III Development Board?

I have been trying to talk to the 4 digit 7-segment display on the Cyclone III development board. The Altera support guys refer me to similar projects using the Cyclone II but I think that developme...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

I am driving the 7 segment LED, but it is so dim that one can hardly read it even in a dark room. And this is at 100% duty cycle.

User a multimeter, I see that the Cyclone III is driving the user LED at 1.8 volts. However, the 7-segment power LED is being driven at 2.5 volts. Even it is dim, but readable. When I try to change the VCCIO for the the user LED pins in the Pin Planner, it has no effect.

How do I change VCCIO for these pins?