NAME

       hal_bb_gpio - Driver for beaglebone GPIO pins

SYNOPSIS

       loadrt hal_bb_gpio user_leds=#,... input_pins=#,... output_pins=#,...

USER LEDS

       The  user_leds  loadrt  parameter  controls which LEDs are available to HAL.  Valid range:
       0..3.  These LEDs are next to the  ethernet  jack  and  the  LinuxCNC  numbers  match  the
       silkscreen  on beaglbone black.  Empirically, these seem to be OR'd with whatever function
       is assigned to the LED in Linux.

   PINS
       bb_gpio.userledN bit in
       bb_gpio.userledN-invert bit in
              The associated LED is lit if userledN xor userledN-invert is TRUE.

INPUT PINS

       The input_pins loadrt parameter controls which physical I/O pins are available to  HAL  as
       input  pins.  The numbering is "800+N" for pin N on connector P8, and "900+N" for pin N on
       connector P9.  For example, "803" means connector P8 pin 3, which  is  also  described  in
       BeagleBone documentation as "gpmc_ad6".

       Specifying pins that are otherwise in use by the system may have undesirable side effects,
       such as crashing rtapi_app or the whole system.

   PINS
       bb_gpio.pN.in-NN bit out
       bb_gpio.pN.in-NN-invert bit in
              in-NN is a snapshot of the value of the corresponding physical pin XOR the value of
              the corresponding in-NN-invert pin.

OUTPUT PINS

       The  input_pins  loadrt parameter controls which physical I/O pins are available to HAL as
       input pins.  The numbering is "800+N" for pin N on connector P8, and "900+N" for pin N  on
       connector P9.

       Specifying pins that are otherwise in use by the system may have undesirable side effects,
       such as crashing rtapi_app or the whole system.

   PINS
       bb_gpio.pN.out-NN bit out
       bb_gpio.pN.out-NN-invert bit in
              The corresponding physical pin is driven with the result of in-NN xor in-NN-invert.

PARAMETERS

       None

FUNCTIONS

       bb_gpio.read
              Update HAL pins from physical pins.

       bb_gpio.write
              Update physical pins from HAL pins.

LICENSE

       GPL