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

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

#include <kernel.h>
#include <proc.h>
#include <device.h>
#include <uart.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

local uartStat(ushort, ushort, ushort, ushort);

command xsh_uartstat(ushort stdin, ushort stdout, ushort stderr,
                     ushort nargs, char *args[])
{
        ushort dev;
        char   n;

        /* Output help, if '--help' argument was supplied */
        if (nargs == 2 && strncmp(args[1],"--help",6) == 0) 
        {
                fprintf(stdout, "Usage: uartstat UARTNUM\n");
                fprintf(stdout, "Displays statistics for uart UARTNUM.\n");
                fprintf(stdout, "\t--help\t display this help and exit\n");
                return OK;
        }

        /* Check for correct number of arguments */
        if (nargs < 2) 
        {
                for ( n = 0; n < NUART; n++ )
                { uartStat( stdin, stdout, stderr, n ); }

                return OK;
        }

        if (nargs > 2) 
        {
                fprintf(stderr, "uartstat: too many arguments\n");
                fprintf(stderr, "Try 'uartstat --help' for more information\n");
                return SYSERR;
        }

        /* Check for valid device */
        dev = (ushort)atol(args[1]);
        if ( dev >= NUART )
        {
                fprintf(stderr, "uartstat: (%d) No such uart\n",dev);
                return SYSERR;
        }

        uartStat( stdin, stdout, stderr, dev );

        return OK;
}

local uartStat(ushort stdin, ushort stdout, ushort stderr, ushort dev)
{
        struct uart       *uptr;  /* pointer to uart entry     */
        struct uart_csreg *ucptr; /* pointer to uart registers */
        char   *label[2] = { "OFF", "ON " };

        /* Initialize pointers */
        uptr  = &uarttab[dev];  
        ucptr = uptr->csr;

        fprintf(stdout, "uart%d:\n", dev);

        /* UART statistics */
        fprintf(stdout, "\tSTATISTICS:\n");
        fprintf(stdout, "\t------------------------------------------\n");
        fprintf(stdout, "\t%8d Characters Output\n", uptr->cout);
        fprintf(stdout, "\t%8d Characters Input\n", uptr->cin);
        fprintf(stdout, "\t%8d Characters Overrun\n", uptr->ovrrn);
        fprintf(stdout, "\t%8d Receiver Error Count\n", uptr->lserr);
        fprintf(stdout, "\t%8d Output IRQ Count\n", uptr->oirq);
        fprintf(stdout, "\t%8d Input IRQ Count\n", uptr->iirq);

        /* Interrupt enable status */
        int enabled;
        fprintf(stdout, "\n\tINTERRUPT ENABLE:\n");
        fprintf(stdout, "\t------------------------------------------\n");

        enabled = (ucptr->ier & UART_IER_ERBFI) ? 1 : 0;
        fprintf(stdout, "\t%s  Receiver FIFO Reached Trigger Level\n",
                label[enabled]);

        enabled = (ucptr->ier & UART_IER_ETBEI) ? 1 : 0;
        fprintf(stdout, "\t%s  Transmitter FIFO Empty\n", label[enabled]);

        enabled = (ucptr->ier & UART_IER_ELSI) ? 1 : 0;
        fprintf(stdout, "\t%s  Receiver Error or BREAK\n", label[enabled]);

        enabled = (ucptr->ier & UART_IER_EMSI) ? 1 : 0;
        fprintf(stdout, "\t%s  Modem Status", label[enabled]);

        fprintf(stdout, "\n");
        return OK;
}

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