Shop OBEX P1 Docs P2 Docs Learn Events
N & V Article March 08 - SX Card Reader — Parallax Forums

N & V Article March 08 - SX Card Reader

MikeSMikeS Posts: 131
edited 2008-03-18 20:18 in General Discussion
Jon’s article in the March Nuts & Volts is about connecting a magnetic card reader up to an SX.· Figure 1 shows the reader connected to what appears to be a SX28DP (SX Tool Kit). In the partial program listing, he refers to enabling the weak internal pull-ups by “appending the word PULLUP to the end of the PIN declaration.” According to the SX/B documentation, internal pull-ups are only available on the SX48 and 52.· Has something changed or am I mistaken. I could not find a complete program listing in the article.
Thanks,
MikeS

Comments

  • BeanBean Posts: 8,129
    edited 2008-03-18 15:33
    Mike,
    I don't know where you saw that, but it is wrong. All the SX pins have pull-ups available.

    Bean.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    www.iElectronicDesigns.com

    ·
  • MikeSMikeS Posts: 131
    edited 2008-03-18 15:46
    Bean,
    Thanks for the reply and clairification. I guess I was confused by the PULLUP command. The help file says:

    PULLUP· ·(SX48/52 Only)

    thanks,
    MikeS
  • BeanBean Posts: 8,129
    edited 2008-03-18 16:07
    Ah,
    I see the confusion. The help file is talking about the PULLUP command, not the PULLUP modifier of the PIN command.

    Bean.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    www.iElectronicDesigns.com

    ·
  • DosManDanDosManDan Posts: 179
    edited 2008-03-18 20:18
    Wow,

    Don't feel bad,·I thought the same thing...until now.

    Dan
Sign In or Register to comment.