sibo-playground/code/inventory/scan.c

/*
 * scan.c - Phase 1 barcode diagnostic: probe BAR: units A/B/C.
 *
 * LLDEV shows demman uses the already-loaded "bar" device (no new driver
 * appears when its scanner runs), so BAR: is the path - we've just been
 * opening the wrong unit. BAR:A/BAR:B gave -41 (no interface in slot) and
 * BAR:D/BAR:E gave -38 (invalid name); BAR:C (the internal position, as MCR
 * uses C for its non-A/B slot) is untried. This tries A, B, C, holds the
 * results on screen, and if one opens, issues p_iow(P_FREAD) (which should arm
 * the laser) and dumps the [count][type][data] decode.
 */
#include <plib.h>
#include "bcode.h"

#define NU 3

GLDEF_C INT main(VOID)
{
    VOID *chan;
    UBYTE buf[256];
    INT   ld, r, i, cnt, opened;
    UINT  k;

    static TEXT *names[NU] = { "BAR:A", "BAR:B", "BAR:C" };
    INT results[NU];

    ld = p_loadldd(BCODE_LDD);
    opened = -1;
    for (k = 0; k < NU; k++) {
        r = p_open(&chan, names[k], (UINT)-1);
        results[k] = r;
        if (r >= 0 && opened < 0)
            opened = k;
    }

    p_printf("load %s: %d\n", BCODE_LDD, ld);
    for (k = 0; k < NU; k++)
        p_printf("open %s: %d\n", names[k], results[k]);

    if (opened < 0) {
        p_printf("\nNo BAR unit opened. Press a key.\n");
        p_getch();
        return 1;
    }

    /* reopen the winner (others were not kept) */
    p_open(&chan, names[opened], (UINT)-1);
    p_printf("\nOpened %s. A read arms the laser - scan now.\n\n", names[opened]);

    for (;;) {
        r = p_iow(chan, P_FREAD, buf);
        if (r < 0) {
            p_printf("read status %d\n", r);
            continue;
        }
        cnt = buf[0];
        if (cnt <= 0) {
            p_printf("(empty read)\n");
            continue;
        }
        p_printf("cnt=%d type=%d:", cnt, buf[1]);
        for (i = 1; i <= cnt && i < 256; i++)
            p_printf(" %d", buf[i]);
        p_printf("  \"");
        for (i = 1; i <= cnt && i < 256; i++)
            p_putch(buf[i] >= ' ' ? buf[i] : '.');
        p_printf("\"\n");
    }
}