Intel® Quartus® Prime Software
Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
17253 Discussions

gpio input stuck on high level '1'

Altera_Forum
Honored Contributor II
‎09-18-2015 07:47 PM
1,467 Views

HI, i'm make a project using DE0-nano board. in my project i build a uart that recieve a signals from external bluetooth device and translate their ascii code to turn of the leds of the DEO-Nano. i defined one of my gpio as a input pin (GPIO_04) that conected to the blootooth device. the program is not working, and with some checks that i made, i found out that the signal that i get from the gpio is always in high level ('1') even it's doesn't conected to nothing. why is that happen? maby i need to change some settings of the gpio?

0 Kudos

Link Copied

1 Reply
Altera_Forum
Honored Contributor II
‎09-19-2015 01:49 PM
630 Views

You can double check the board schematic to see if there is any signal pulling that input pin to high. Also, check the Fitter report to see if it has internal pull up set or tied to vcc?

0 Kudos
Copy link
Reply

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.