Jump to content

How to test Shiftregister pins?


Thomas
 Share

Recommended Posts

Hallo!

I have a problem with the shiftregister of one PIC.

The DIN-shiftregister does not work.

When I press button 8 on the first shiftregister it is like pressing all 40 buttons, but pressing onother button has no effect.

(The DOUT register do not work, too.)

I have no scope, so I messured the voltage on pins D3 and D2 with a multimeter. I get 0.16V and 2.55V. BUT on the other pic that works I messure 0.08V and 3.5V.

I changed the EQU of the pins in the MIOS-src, compiled a new MIOS with interchanged D2 and D3 and I messured 2.55V and 0.16V as expected. The pins have changed.

All connections seems ok, and even worse, it had worked last week!

Something must be broken and I could find it. I replaced the 165, too.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...