Meaning of IntPullUp for I2C

      Meaning of IntPullUp for I2C

      Hello,

      what is the meaning of the entry “IntPullUp” for the native I2C driver?
      According to the document “Device Driver Documentation” (Version 1.04, 2015-04-09) the registry entry “IntPullUp” for the native I2C driver supports the following values:
      0: Disable internal pull-up (default)
      1: 100k pull-down
      2: 47k pull-up
      3: 100k pull-up
      4: 22k pull-up

      The description of the soft I2C driver states that the IntPullUp value is related to SCL and SDA.
      Because the F&S image for the efusA9 / efusA9X has this value configured to 1 and SDA and SCL are high I’m not sure about the meaning of this parameter.


      Best regards,
      Steffen
      Hello,
      serveral I2C on EFUS has 4k7 on-board pull-ups (HW Docu.). So 100k pull-down is negligible and you measure almost 3.3V.
      Some ohter A9 boards do not have on-board pull-ups.
      F&S Elektronik Systeme GmbH
      As this is an international forum, please try to post in English.
      Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.