AnsweredAssumed Answered

Problem with GPIO output voltage

Question asked by Luciano on May 26, 2012
Latest reply on May 29, 2012 by Luciano

Hello,

I'm using GPIO with sysfs interface on Blackfin bf518 (as reported  in http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:gpio-sysfs) and it works, but I have problems with PH0 and PH1.

 

When I configure PH0 or PH1 as "output" and  for example  I set PH0 with "high" output, measured voltage on this pin, is 1 - 1.2 volts instead 3.3 volt.

I think to have disabled drivers in kernel configuration that uses these PORTH..

I don't understand why output voltage is 1.2v instead 3.3v

 

 

Thank you!

Outcomes