def _read_data(self, mode, data_type):
self._send_command(_CMD_RESET)
self._send_command(_CMD_SET_MODE, mode)
raw_data = self._send_command(_CMD_READ)
if tuple(raw_data[3:5]) != data_type:
raise ExpectationNotMet('device returned incorrect data type')
return raw_data[5:]
def _compute_rgb_address(self):
if self._rgb_address:
return
# the dimm's rgb controller is typically at 0x58–0x5f
candidate = self._RGB_DTIC | (self._address[2] & self._SA_MASK)
# reading from any register should return 0xba if we have the right device
if self._smbus.read_byte_data(candidate, self._REG_RGB_MODE) != 0xba:
raise ExpectationNotMet(f'{self.bus}:{candidate:#04x} is not the RGB controller')
self._rgb_address = candidate