diag(inventory): held BAR:A/B open report + read-arms-laser test

code/inventory/scan.c

@@ -1,39 +1,59 @@
 /*
- * scan.c - Phase 1 barcode diagnostic: keyboard / scan-key route.
+ * scan.c - Phase 1 barcode diagnostic: pin down the BAR: device.
  *
- * A working on-device demo triggers the laser from the keyboard scan key, so
- * the system arms the scanner and delivers the decode via the scan-key path -
- * not via an app-opened TTY:D or BAR: channel (both of which gave us nothing).
- * This build opens NOTHING and simply reads the keyboard, echoing every key
- * code. If the decoded barcode is injected as keystrokes (a "wedge"), it will
- * appear here.
- *
- * Test order:
- *   1. Press normal keys ('1' = 49, '2' = 50, ...) to confirm the read works.
- *   2. Press the scan key and scan a barcode - watch for the digits.
- * Esc (27) quits.
+ * The scan key is keycode 368 (a Window Server key event an app catches to
+ * trigger a scan); the working demo draws the decode itself, so it uses a
+ * scanner API - and the only barcode software path in this SDK is the bar*.ldd
+ * decoder device "BAR:". Our BAR: open has been failing but its exact error
+ * kept scrolling away. This build loads BAREAN, opens BAR:A (then BAR:B),
+ * reports each result and HOLDS the screen. If a channel opens, it issues
+ * p_iow(P_FREAD) - which should arm the laser - and dumps the decode.
  */
 #include <plib.h>
+#include "bcode.h"
 
 GLDEF_C INT main(VOID)
 {
-    INT c, cnt;
+    VOID *chan;
+    UBYTE buf[256];
+    INT   ld, ra, rb, r, i, cnt;
 
-    p_printf("Keyboard/scan-key test.\n");
-    p_printf("Press keys; press the scan key and scan a barcode.\n");
-    p_printf("Esc (27) quits.\n\n");
+    ld = p_loadldd(BCODE_LDD);
+    ra = p_open(&chan, "BAR:A", (UINT)-1);
+    if (ra < 0)
+        rb = p_open(&chan, "BAR:B", (UINT)-1);
+    else
+        rb = 0;
 
-    cnt = 0;
-    for (;;) {
-        c = p_getch();
-        cnt++;
-        p_printf(" %d", c);
-        if (c == 13 || c == 10)
-            p_printf(" <EOL>\n");
-        if (c == 27)
-            break;
+    p_printf("load %s: %d\n", BCODE_LDD, ld);
+    p_printf("open BAR:A: %d\n", ra);
+    if (ra < 0)
+        p_printf("open BAR:B: %d\n", rb);
+
+    if (ra < 0 && rb < 0) {
+        p_printf("\nNo BAR channel opened. Press a key.\n");
+        p_getch();
+        return 1;
     }
 
-    p_printf("\n%d keys read.\n", cnt);
-    return 0;
+    p_printf("\nOpen. A read should arm the laser - scan now.\n\n");
+    for (;;) {
+        r = p_iow(chan, P_FREAD, buf);   /* arms laser, blocks for a decode */
+        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");
+    }
 }