def parse_value(self, value):
if value.endswith("%"):
percent = int(value[0:-1])
return percent2amplification(percent)
elif value.lower().endswith("db"):
db = int(value[0:-2])
return decibel2amplification(db)
elif "." in value:
return float(value)
elif value.startswith("0x"):
return int(value, 16)
else:
return int(value)
def update_dsp(self, value):
if value is None:
return
# convert percent to multiplier
volume = percent2amplification(value)
# write multiplier to DSP
dspdata = datatools.int_data(self.dsp.decimal_repr(volume),
self.volume_register_length)
self.spi.write(self.volume_register, dspdata)
self.dspdata = dspdata
self.dspvol = value
def string_to_volume(self, strval):
strval = strval.lower()
vol = 0
if strval.endswith("db"):
try:
dbval = float(strval[0:-2])
vol = decibel2amplification(dbval)
except:
logging.error("Can't parse db value {}", strval)
return None
# TODO
elif strval.endswith("%"):
try:
pval = float(strval[0:-1])
vol = percent2amplification(pval)
except:
logging.error("Can't parse db value {}", strval)
return None
else:
vol = float(strval)
return vol
def update_volume(self):
if self.volume_register is None or self.spdif_register is None:
return False
# Read SPDIF status registers
data = self.spi.read(0xf617, 6)
if len(data) != 6:
logging.error("internal error: could not read 6 bytes from SPI")
return False
_b1, vol, volid, _b2 = struct.unpack(">BHHB", data)
if volid != 0x048a:
return False
if vol < 0x100f or vol > 0x164f:
return False
# Read SPDIF enable register
data = self.spi.read(self.spdif_register, 4)
[spdif_active] = struct.unpack(">l", data)
if spdif_active == 0:
return False
volpercent = (vol - 0x100f) / 16
if volpercent < 0 or volpercent > 100:
logging.error(
"internal error, got volume = %s, "
"but should be in 0-100 range", volpercent)
# convert percent to multiplier
volume = percent2amplification(volpercent)
# write multiplier to DSP
dspdata = datatools.int_data(self.dsp.decimal_repr(volume),
self.volume_register_length)
self.spi.write(self.volume_register, dspdata)
return True
def write_volume(self, volume):
assert 0 <= volume <= 100
dspdata = datatools.int_data(
self.dsp.decimal_repr(percent2amplification(volume)),
self.dsp.WORD_LENGTH)
self.spi.write(self.volume_register, dspdata)