ch552: Misc. cleanup

- Merge Makefile and Makefile.include into Makefile
  - Format structure
  - Remove unused variables, targets etc.

- Add missing check if it is ok to send data to the FPGA.

- Remove 'baud rate calculator.ods'

- Update encode_usb_strings.py to generate strings for
  CdcCtrlInterfaceDesc, CdcDataInterfaceDesc,
  FidoHidInterfaceDesc, TkeyCtrlInterfaceDesc.
  Also store generated strings in UTF-16 instead of hex.

- Update usb_strings.h to match new encode_usb_strings.py
  output.

- Remove unused struct SetupReqBuf.

hw/usb_interface/ch552_fw/encode_usb_strings.py

@@ -20,37 +20,51 @@ def descriptor_to_string(descriptor):
 def string_to_descriptor(string):
     """ Convert a python string into a bytes object containing a USB string descriptor"""
     descriptor = bytearray()
-    descriptor.append(0x00) # placeholder for length
-    descriptor.append(0x03)
+    descriptor.append(0x00) # Placeholder for length
+    descriptor.append(0x03) # Descriptor type (String)
     descriptor.extend(string.encode('utf-16')[2:]) # crop the BOM
-    descriptor[0] = len(descriptor)
+    descriptor[0] = len(descriptor) # Set length of this descriptor (in bytes)
 
     return bytes(descriptor)
 
+def format_descriptor(name, value):
+    descriptor = string_to_descriptor(value)
+    formatted = [
+        'unsigned char FLASH {}[] = {{  // "{}"'.format(name, value),  # Add string as a comment
+        '    {},    // Length of this descriptor (in bytes)'.format(descriptor[0]),
+        '    0x03,  // Descriptor type (String)'
+    ]
+
+    formatted.extend(
+        [
+            '    ' + ', '.join(
+                ["'{}', 0".format(chr(b)) if b != 0x00 else "0x00" for b in descriptor[2 + i:2 + i + 8:2]]
+            ) + ','
+            for i in range(0, len(descriptor[2:]), 8)  # 8 bytes = 4 characters
+        ]
+    )
+    formatted.append('};\n')
+    return '\n'.join(formatted)
 
 if __name__ == "__main__":
-    manufacturer = 'Tillitis'
-    product = 'MTA1-USB-V1'
-    serial = "68de5d27-e223-4874-bc76-a54d6e84068f"
+    strings = {
+        "ProdDesc": "MTA1-USB-V1",
+        "ManufDesc": "Tillitis",
+        "SerialDesc": "68de5d27-e223-4874-bc76-a54d6e84068f",
+        "CdcCtrlInterfaceDesc": "CDC-Ctrl",
+        "CdcDataInterfaceDesc": "CDC-Data",
+        "FidoHidInterfaceDesc": "FIDO-HID",
+        "TkeyCtrlInterfaceDesc": "TKEY-Ctrl"
+    }
+
+    with open('include/usb_strings.h', 'w') as f:
+        f.write('#ifndef __USB_STRINGS_H__\n')
+        f.write('#define __USB_STRINGS_H__\n')
+        f.write('\n')
+        f.write('#include "mem.h"\n')
+        f.write('\n')
+
+        for name, value in strings.items():
+            f.write(format_descriptor(name, value) + '\n')
 
-    with open('usb_strings.h', 'w') as f:
-        f.write('#ifndef USB_STRINGS\n')
-        f.write('#define USB_STRINGS\n')
-    
-        f.write('unsigned char __code ProdDesc[]={{  // "{}"\n'.format(product))
-        f.write('    ')
-        f.write(', '.join(['0x{:02x}'.format(i) for i in string_to_descriptor(product)]))
-        f.write('\n};\n\n')
-        
-        f.write('unsigned char __code ManufDesc[]={{  // "{}"\n'.format(manufacturer))
-        f.write('    ')
-        f.write(', '.join(['0x{:02x}'.format(i) for i in string_to_descriptor(manufacturer)]))
-        f.write('\n};\n\n')
-    
-        f.write('unsigned char __code SerialDesc[]={{  // "{}"\n'.format(serial))
-        f.write('    ')
-        f.write(', '.join(['0x{:02x}'.format(i) for i in string_to_descriptor(serial)]))
-        f.write('\n};\n\n')
-    
-    
         f.write('#endif\n')