gpioselect.c

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/* gpioselect.h - pin multiplexing and control for the BBB ZCZ package */
#include <xinu.h>

/*------------------------------------------------------------------------
 *  gpioselect  -  Configure modes for GPIO pins
 *------------------------------------------------------------------------
 */
devcall gpioselect(     
        uint32 pinreg,      /* Pin to be affected       */
        uint32 pinmode,     /* Multiplexed pin function */ 
        uint32 pinsettings  /* Settings for the pin     */
)   
{
    volatile uint32* confreg; /* Pin configuration register */

    /* Pick up the pin configuration register address */

    confreg = &(((uint32*)PINMUXBASE)[pinreg]);

    /* Apply the specified settings to the pin */

    *confreg = pinmode|pinsettings;

    return OK;
}