Type Definition linuxcnc_hal_sys::hal_pin_dir_t

type hal_pin_dir_t = i32;

HAL pins have a direction attribute. A pin may be an input to the HAL component, an output, or it may be bidirectional. Any number of HAL_IN or HAL_IO pins may be connected to the same signal, but only one HAL_OUT pin is permitted. This is equivalent to connecting two output pins together in an electronic circuit. (HAL_IO pins can be thought of as tri-state outputs.)