sibo-playground/code/inventory/scan.c

/*
 * scan.c - Phase 1: read the integral laser via WL2:D (reverse-engineered init).
 *
 * From disassembling SCANNER.DYL in the MX ROM, the scanner is driven over the
 * SIBO I/O executive (int 0xCF), i.e. the p_iow(chan, func, ...) layer. After
 * opening WL2:D the driver is enabled with two control ops (function codes 6
 * then 7 on the channel), after which decoded barcodes can be read. Decoded
 * output is terminated by CR LF (default Symbol2 postamble 0x0D 0x0A).
 *
 * This is the first RE-based attempt: the enable-then-read path. The full config
 * download (cl=0x0C command-byte writes) is not replicated here - if the driver
 * applies Symbol2 defaults on open, enable+read should suffice; if not, we add
 * the config writes next. Press the scan key to fire the laser.
 */
#include <plib.h>

#define WL2_ENABLE1 6
#define WL2_ENABLE2 7

GLDEF_C INT main(VOID)
{
    VOID *chan;
    UBYTE buf[256];
    INT   err, r, i;

    err = p_open(&chan, "WL2:D", (UINT)-1);
    p_printf("open WL2:D: %d\n", err);
    if (err < 0) {
        p_printf("Press a key to exit.\n");
        p_getch();
        return 1;
    }

    r = p_iow(chan, WL2_ENABLE1);
    p_printf("enable op6: %d\n", r);
    r = p_iow(chan, WL2_ENABLE2);
    p_printf("enable op7: %d\n", r);

    p_printf("\nScan a barcode (press scan key). Dumping reads:\n\n");

    for (;;) {
        r = p_iow(chan, P_FREAD, buf);
        if (r < 0) {
            p_printf("read status %d\n", r);
            continue;
        }
        p_printf("r=%d b0=%d:", r, buf[0]);
        for (i = 0; i < 24 && i < 256; i++)
            p_printf(" %d", buf[i]);
        p_printf("  \"");
        for (i = 0; i < 24 && i < 256; i++)
            p_putch(buf[i] >= ' ' ? buf[i] : '.');
        p_printf("\"\n");
    }
}