Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/shell/xsh_gpiostat.c

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/* Embedded XINU, Copyright (C) 2007.  All rights reserved. */

#include <kernel.h>
#include <gpio.h>
#include <stdio.h>
#include <string.h>

command xsh_gpiostat(ushort stdin, ushort stdout, ushort stderr,
                     ushort nargs, char *args[])
{
        struct gpio_csreg *pgcsr;           /* pointer to gpio registers     */
        uchar  p;
        ulong offset;

        /* Output help, if '--help' argument was supplied */
        if (nargs == 2 && strncmp(args[1],"--help",6) == 0)
        {
                fprintf(stdout, "Usage: gpiostat\n");
                fprintf(stdout, "Displays statitics for general purpose ");
                fprintf(stdout, "input/output pins.\n");
                fprintf(stdout, "\t--help\t display this help and exit\n");
                return SYSERR;
        }

        /* Check for correct number of arguments */
        if (nargs > 1) 
        {
                fprintf(stderr, "gpiostat: too many arguments\n");
                fprintf(stderr, "Try 'gpiostat --help' for more information.\n");
                return SYSERR;
        }

        /* Initialize pointers */
        pgcsr = (struct gpio_csreg *)GPIO_BASE;

        /* Output GPIO pin status */
        offset = 0;

        fprintf(stdout, "PIN MODE   INPUT   OUTPUT  CONTROL\n");
        fprintf(stdout, "--- ------ ------- ------- -------\n");
        for (p = 0; p < GPIO_PIN_COUNT; p++)
        {
                offset = 1 << p;
                fprintf(stdout, "%2d ", p);
                if (pgcsr->enable & offset)
                { fprintf(stdout, " Output "); }
                else
                { fprintf(stdout, " Input  "); }
                fprintf(stdout, "   %1d    ", (pgcsr->input & offset) >> p);
                fprintf(stdout, "   %1d    ", (pgcsr->output & offset) >> p);
                fprintf(stdout, "   %1d    ", (pgcsr->control & offset) >> p);
                fprintf(stdout, "\n");
        }
        
        return OK;
}

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