LPBB(4) NetBSD Programmer's Manual LPBB(4)

NAME

lpbb

parallel port I2C bit-banging interface

SYNOPSIS

lpbb* at ppbus?
iic* at lpbb?

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 -------------------------------------------------------

FILES

None: see BUGS.

SEE ALSO

ppbus(4)

HISTORY

The lpbb manual page first appeared in FreeBSD 3.0.

AUTHORS

This manual page is based on the FreeBSD lpbb(4) manual page and has been updated for NetBSD's port by Gary Thorpe.

BUGS

lpbb needs to be assigned a major device number manually. The device special file also needs to be created manually.

February 16, 2003