FreeBSD 7.0 manual page repository

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lpbb - parallel port I2C bit-banging interface

 

NAME

      lpbb - parallel port I2C bit-banging interface
 

SYNOPSIS

      device iicbus
      device iicbb
 
      device lpbb
      device iic
 

DESCRIPTION

      The lpbb driver supports the Philips official I2C parallel bit-banging
      interface.
 
                                               LS05 pin 14 (Vcc) o      -------
                                                                 |      |     |
                  +--+--+---------------------+--+--+------------+------+-o 1 |
                  |  |  |                     |  |  |           ===.1uF | +5V |
        -------- [R][R][R] 3x10K       3x10K [R][R][R]   LS05    |      |     |
        |      |  |  |  |                     |  |  |    pin 7 o-+------+-o 2 |
        | 12 o-+--+  |  |   3|\ 4             |  |  |    (Gnd)          | GND |
        | 17 o-+-----|--|----| >o-------------+--|--|--------------+    |     |
        |      |     |  |    |/        8 /|9     |  |     10 /|11  +----+-o 3 |
        | 15 o-+-----+--|--------------o< |------+--|------o< |----+    | SCL |
        |      |        |   1|\ 2        \|         |        \|         |     |
        |  9 o-+--------|----| >o-------------------+--------------+----+-o 4 |
        |      |        |    |/                            6 /|5   |    | SDA |
        | 11 o-+--------+----------------------------------o< |----+    -------
        | 10 o-+-+                                           \|          4-pin
        | 13 o-+-+--oGND                                              Connector
        | 25 o-+-+      ------------------ Part List --------------------------
        --------        | 1 - .1 uF capacitor   | 6 - 10K 5% resistors        |
        25-pin male D   | 1 - 4-pin connector   | 1 - 25-pin male D connector |
        connector to PC | 1 - 74LS05 open collector hex inverter              |
        printer port    -------------------------------------------------------
      iicbb(4), iicbus(4), ppbus(4)
 

HISTORY

      The lpbb manual page first appeared in FreeBSD 3.0.
 

AUTHORS

      This manual page was written by Nicolas Souchu.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.