first version of morning edition in python

diagnose2.py

@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+"""
+Printer diagnostic v2 — tests print area width, character spacing,
+and direct USB device access on Epson TM-T88V.
+"""
+import subprocess, sys, time, glob
+
+PRINTER = "receipt"
+
+ESC = b'\x1b'
+GS  = b'\x1d'
+
+INIT      = ESC + b'\x40'
+FONT_A    = ESC + b'\x4d\x00'
+FONT_B    = ESC + b'\x4d\x01'
+SIZE_NORM = GS  + b'\x21\x00'    # GS ! 0 — 1x1 character size
+SP_ZERO   = ESC + b'\x20\x00'    # ESC SP 0 — zero right-side char spacing
+# GS L nL nH — set left margin to 0
+MARGIN_L  = GS  + b'\x4c\x00\x00'
+# GS W nL nH — set print area width
+# 576 dots = full 80mm printable width (203dpi): 576 = 0x0240 -> nL=0x40 nH=0x02
+WIDTH_576 = GS  + b'\x57\x40\x02'
+# 512 dots — conservative full width
+WIDTH_512 = GS  + b'\x57\x00\x02'
+# 480 dots (what 42 chars x ~11.4 dots rounds to)
+WIDTH_480 = GS  + b'\x57\xe0\x01'
+
+CUT       = GS  + b'\x56\x00'
+
+RULER_42  = "123456789|123456789|123456789|123456789|12"
+RULER_56  = "123456789|123456789|123456789|123456789|123456789|123456"
+
+def send_lpr(data: bytes):
+    r = subprocess.run(["lpr", "-P", PRINTER, "-o", "raw"],
+                       input=data, capture_output=True)
+    if r.returncode != 0:
+        print("  lpr error:", r.stderr.decode().strip(), file=sys.stderr)
+        return False
+    return True
+
+def send_usb(data: bytes):
+    """Try writing directly to the USB device, bypassing CUPS entirely."""
+    devices = sorted(glob.glob("/dev/usb/lp*"))
+    if not devices:
+        print("  No /dev/usb/lp* devices found", file=sys.stderr)
+        return False
+    dev = devices[0]
+    print(f"  Writing directly to {dev}")
+    try:
+        with open(dev, "wb") as f:
+            f.write(data)
+        return True
+    except PermissionError:
+        print(f"  Permission denied on {dev} -- try: sudo chmod a+rw {dev}", file=sys.stderr)
+        return False
+    except Exception as e:
+        print(f"  USB write error: {e}", file=sys.stderr)
+        return False
+
+def strip(label, init_seq, font=FONT_A, ruler=RULER_42, via_usb=False):
+    body = (
+        f"\n[{label}]\n"
+        f"{ruler}\n"
+        f"The quick brown fox jumps over...\n"
+        f"\n"
+    ).encode("ascii")
+    data = init_seq + font + body + b"\n\n" + CUT
+    ok = send_usb(data) if via_usb else send_lpr(data)
+    status = "OK" if ok else "FAILED"
+    print(f"  {status}: {label}")
+    time.sleep(3)
+
+print("=== Diagnostic v2: print area & spacing tests ===\n")
+
+print("Test 1: Baseline (same as v1 test 1) via lpr")
+strip("T1 Font-A baseline lpr",
+      INIT + SIZE_NORM)
+
+print("Test 2: ESC SP 0 (zero right-side character spacing)")
+strip("T2 Font-A + SP=0",
+      INIT + SIZE_NORM + SP_ZERO)
+
+print("Test 3: GS L 0 + GS W 576 (full printable area)")
+strip("T3 Font-A + margin=0 width=576",
+      INIT + SIZE_NORM + SP_ZERO + MARGIN_L + WIDTH_576)
+
+print("Test 4: GS W 512")
+strip("T4 Font-A + width=512",
+      INIT + SIZE_NORM + SP_ZERO + MARGIN_L + WIDTH_512)
+
+print("Test 5: Font B + full area reset")
+strip("T5 Font-B + SP=0 + width=576",
+      INIT + SIZE_NORM + SP_ZERO + MARGIN_L + WIDTH_576,
+      font=FONT_B, ruler=RULER_56)
+
+print("\nTest 6: Direct USB write (bypasses CUPS entirely) -- Font A")
+strip("T6 Font-A direct USB",
+      INIT + SIZE_NORM + SP_ZERO,
+      via_usb=True)
+
+print("\nDone.")
+print("Key question: does Test 6 (direct USB) give more chars than Test 1?")
+print("If yes -> CUPS is modifying the raw data even with -o raw.")
+print("If all same -> printer NV memory has a constrained print area.")
+print("Report what you see on each strip.")