def __init__(self):
"""
Abstraction of the HW layer.
"""
self._signature = MappedBuffer(fields=(
{
"first_byte": "B"
},
{
"second_byte": "B"
},
))
self._signature.first_byte = ord(self._SIGNATURE[0])
self._signature.second_byte = ord(self._SIGNATURE[1])
self._header = MappedBuffer(fields=(
{
"message_len": "B"
},
{
"message_id": "B"
},
))
self._payload = []
self._checksum = MappedBuffer(fields=({"checksum": "B"}, ))
self._deadline = None
def encode(self, data):
"""
Generates the byte sequence for a USB keyboard command.
"""
# pylint: disable=exec-used
# pylint: disable=unused-argument
buf = MappedBuffer(fields=(
{
"byte_0": "B"
},
{
"byte_1": "B"
},
{
"byte_2": "B"
},
{
"byte_3": "B"
},
{
"byte_4": "B"
},
{
"byte_5": "B"
},
{
"byte_6": "B"
},
{
"byte_7": "B"
},
))
for index in range(0, 8):
exec("buf.byte_" + str(index) + " = data['buffer'][" + str(index) +
"]")
state = CMD_NEW_KEYBOARD_DATA
return self.pack(command_id=state, data=buf.pack())
