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Altera_Forum
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11 years ago

Taking input by expansion header

Hello I am working with a project using DE1 board. In my project I have to take input from a external circuit of 3.5 v . I use seven segment display to see my output in DE1 board . My verilog ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

I have the same problem, that I get no input from the GPIO pins of the de1. Output is no problem and I can measure the voltage. But when I want to use a gpio pin as input, it is always tied to ground. I tried an external pull-up resistor as well as the internal pull-up resistor, but it doesn't change anything. For testing I use one of the leds for signalling. When I use on of the switches as input everything works fine. Has anyone some idea or had the same problem and solved it?