gpiowrite.c File Reference

#include <xinu.h>

Include dependency graph for gpiowrite.c:

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Functions
devcall	gpiowrite (struct dentry *devptr, char *value, int32 pinmask)

Function Documentation

gpiowrite()

devcall gpiowrite	(	struct dentry *	devptr,
		char *	value,
		int32	pinmask
	)

Definition at line 9 of file gpiowrite.c.

References gpio_csreg::clear_data, dentry::dvcsr, OK, and gpio_csreg::set_data.

{
    struct gpio_csreg *csrptr;  /* Pointer to GPIO CSRs     */
    uint32 val;         /* Value to be written      */

    csrptr = (struct gpio_csreg *)(devptr->dvcsr);
    val = * (uint32 *)value;

    /* Set bits that should become one */

    csrptr->set_data = pinmask & val;   

    /* Clear bits that should become zero */

    csrptr->clear_data = pinmask & ~val;

    return OK;
}