Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
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

--- Quote Start ---

When i use gpio pin as input direction it gives me the output voltage 3.5 volts . I use i/o standard default lvttl 3.5(default) . How can i unify the ground pin. How can i tell i am going to use a pin as ground in my program?

--- Quote End ---

You do NOT specify a pin as a ground or a vcc, but rather they are fixed pins of the GPIO port. On my DE1-SoC, ground pins are the 12th and the 30th, the 3.5v pin is the 29th pin and the 5v pin is the 11th pin.