first version of morning edition in python

readmsw.py

@@ -0,0 +1,88 @@
+#!/usr/bin/env python3
+"""
+Read TM-T88V memory switch values back from the printer via USB.
+GS ( E fn=4 asks the printer to transmit its current memory switch settings.
+"""
+import sys, time, select
+
+ESC = b'\x1b'
+GS  = b'\x1d'
+DEV = "/dev/usb/lp0"
+
+INIT = ESC + b'\x40'
+CUT  = GS  + b'\x56\x00'
+
+def gs_e(fn: int, data: bytes = b'') -> bytes:
+    payload = bytes([fn]) + data
+    pL = len(payload) & 0xFF
+    pH = (len(payload) >> 8) & 0xFF
+    return GS + b'\x28\x45' + bytes([pL, pH]) + payload
+
+# fn=4: Transmit memory switch (all groups)
+QUERY_MSW = gs_e(4, b'')
+# fn=6: Transmit customized values
+QUERY_CUSTOM = gs_e(6, b'')
+
+try:
+    f = open(DEV, "r+b", buffering=0)
+except PermissionError:
+    print(f"Permission denied on {DEV} -- run: sudo chmod a+rw {DEV}")
+    sys.exit(1)
+
+print("Querying memory switches (fn=4)...")
+f.write(INIT + QUERY_MSW)
+f.flush()
+time.sleep(0.5)
+
+# Try to read response
+response = b''
+deadline = time.time() + 2.0
+while time.time() < deadline:
+    r, _, _ = select.select([f], [], [], 0.2)
+    if r:
+        chunk = f.read(64)
+        if chunk:
+            response += chunk
+    else:
+        if response:
+            break
+
+if response:
+    print(f"Memory switch response ({len(response)} bytes):")
+    print("  hex:", response.hex())
+    print("  dec:", list(response))
+    print()
+    # GS ( E fn=4 response format: header + 8 bytes (one per MSW group)
+    # Find the data bytes after any header
+    for i, b in enumerate(response):
+        print(f"  byte[{i}] = 0x{b:02x} ({b:08b}b)")
+else:
+    print("No response to fn=4 query.")
+
+print()
+print("Querying customized values (fn=6)...")
+f.write(QUERY_CUSTOM)
+f.flush()
+time.sleep(0.5)
+
+response2 = b''
+deadline = time.time() + 2.0
+while time.time() < deadline:
+    r, _, _ = select.select([f], [], [], 0.2)
+    if r:
+        chunk = f.read(64)
+        if chunk:
+            response2 += chunk
+    else:
+        if response2:
+            break
+
+if response2:
+    print(f"Customized value response ({len(response2)} bytes):")
+    print("  hex:", response2.hex())
+    for i, b in enumerate(response2):
+        print(f"  byte[{i}] = 0x{b:02x} ({b:08b}b)")
+else:
+    print("No response to fn=6 query.")
+
+f.close()