feat(inventory): load decoder LDD + open BAR: instead of raw TTY:D

code/inventory/bcode.c

@@ -1,21 +1,26 @@
 /*
- * bcode.c - barcode scanner serial channel (see bcode.h).
+ * bcode.c - barcode scanner input via the software decoder LDD (see bcode.h).
  */
 #include "bcode.h"
 
+GLDEF_C INT bcodeLoad(VOID)
+{
+    /*
+     * Load the EAN/UPC decoder LDD. p_loadldd assumes a .LDD extension, and
+     * looks along the current path if no full path is given, so BAREAN.LDD
+     * must be present on the device. If the system already loaded it (e.g. via
+     * config), this returns E_FILE_EXIST, which the caller treats as success.
+     */
+    return p_loadldd(BCODE_LDD);
+}
+
 GLDEF_C INT bcodeOpen(VOID **pChan)
 {
     /*
-     * TTY:D = the top internal slot's serial port, where the barcode module
-     * sits. mode -1 asks the driver for its default open mode.
-     *
-     * If the scanner needs specific line settings (baud rate, parity, stop
-     * bits), configure the channel after opening with
-     *     p_iow(*pChan, P_FSET, &config);
-     * where config is an E_CONFIG struct from p_config.h. See the RS232
-     * section of the PLIB Reference. The module runs at up to 9600 baud.
+     * Open the decoder device. Opening it powers and enables the scanner; the
+     * LDD decodes the raw laser signal and delivers decoded barcodes on reads.
      */
-    return p_open(pChan, "TTY:D", (UINT)-1);
+    return p_open(pChan, BCODE_DEV, (UINT)-1);
 }
 
 GLDEF_C VOID bcodeClose(VOID *chan)
@@ -23,24 +28,3 @@ GLDEF_C VOID bcodeClose(VOID *chan)
     if (chan != NULL)
         p_close(chan);
 }
-
-GLDEF_C INT bcodeAssemble(UBYTE *raw, INT n, TEXT *line, INT *pLen, INT max)
-{
-    INT i;
-
-    for (i = 0; i < n; i++) {
-        UBYTE c = raw[i];
-
-        if (c == BCODE_TERM) {
-            line[*pLen] = '\0';
-            *pLen = 0;
-            return 1;
-        }
-        if (c < ' ')          /* skip LF, NULs and other control bytes */
-            continue;
-        if (*pLen < max - 1)
-            line[(*pLen)++] = (TEXT)c;
-        /* else: overflow - drop until the next terminator */
-    }
-    return 0;
-}