NAME

gpio_set_ctl − set control lines on GPIO card

SYNOPSIS

#include <dvio.h>

int gpio_set_ctl(int eid, int value);

DESCRIPTION

gpio_set_ctl() sets the control register of a GPIO interface.  eid is an entity identifier of an open GPIO device file obtained from an open(), dup(), fcntl(), or creat() call (see open(2), dup(2), fcntl(2), and creat(2)). value is the value to be written into the control register of the GPIO interface associated with eid.

value is mapped onto the control lines on the interface card, with the least significant bit mapped to CTL0.  Only the x least significant bits are used, where x is the number of control lines available on the hardware interface being used. 

DEPENDENCIES

Series 300/400

For the HP98622A, x is 2. 

Series 800

For the HP27114A, x is 3. 

For the HP27114B, x is 6. 

For the HP28651A, x is 5. 

RETURN VALUE

gpio_set_ctl() returns 0 if successful and −1 if an error was encountered. 

ERRORS

gpio_set_ctl() fails if any of the following conditions are encountered, and sets errno accordingly:

[EBADF] eid does not refer to an open file. 

[ENOTTY] eid does not refer to a GPIO device file. 

Hewlett-Packard Company  —  HP-UX Release 9.0: August 1992