tillitis-key/hw/boards/mta1-usb-v1/ch552_fw/encode_usb_strings.py

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2022-09-19 02:51:11 -04:00
#!/usr/bin/env python3
def descriptor_to_string(descriptor):
""" Convert a bytes object containing a USB string descriptor into a python string"""
bLength = descriptor[0]
if bLength != len(descriptor):
raise Exception('Descriptor length mismatch, length_field:{} actual_length:{}'.format(
bLength,
len(descriptor)
))
bDescriptorType = descriptor[1]
if bDescriptorType != 0x03:
raise Exception('Descriptor type mismatch, bDescriptorType:{02x} expected:0x03'.format(
bDescriptorType
))
return descriptor[2:].decode('utf-16', errors='strict')
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.extend(string.encode('utf-16')[2:]) # crop the BOM
descriptor[0] = len(descriptor)
return bytes(descriptor)
if __name__ == "__main__":
manufacturer = 'Tillitis'
product = 'MTA1-USB-V1'
serial = "68de5d27-e223-4874-bc76-a54d6e84068f"
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 Prod_Des[]={{ // "{}"\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 Manuf_Des[]={{ // "{}"\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 SerDes[]={{ // "{}"\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')