def __read_image(cls, addr, count):
try:
I2C.start_tx(Host.DFE_EEPROM_ADDR)
content = I2C.read_cmd16(addr, count)
return EEPROMImage(content)
finally:
I2C.end_tx()
def status(self):
try:
I2C.start_tx(self.__addr)
status_msb, status_lsb, _ = I2C.read_cmd16(SHT31.__CMD_READ_STATUS, 3)
return (status_msb << 8) | status_lsb
finally:
I2C.end_tx()
def sample(self):
try:
I2C.start_tx(self.__addr)
temp_msb, temp_lsb, _, humid_msb, humid_lsb, _ = I2C.read_cmd16(
SHT31.__CMD_READ_SINGLE_HIGH, 6)
raw_humid = (humid_msb << 8) | humid_lsb
raw_temp = (temp_msb << 8) | temp_lsb
return SHTDatum(SHT31.humid(raw_humid), SHT31.temp(raw_temp))
finally:
I2C.end_tx()
def sample(self):
if self.__addr == 0:
return None
try:
I2C.start_tx(self.__addr)
temp_msb, temp_lsb, _, humid_msb, humid_lsb, _ = I2C.read_cmd16(SHT31.__CMD_READ_SINGLE_HIGH, 6,
wait=self.MEASUREMENT_DURATION)
raw_humid = (humid_msb << 8) | humid_lsb
raw_temp = (temp_msb << 8) | temp_lsb
return SHTDatum(SHT31.humid(raw_humid), SHT31.temp(raw_temp))
finally:
I2C.end_tx()
def __read(self, command, wait, count=0):
try:
self.obtain_lock()
try:
I2C.start_tx(self.__i2c_addr)
encoded = I2C.read_cmd16(command, count)
values = self.__decode(encoded)
finally:
I2C.end_tx()
time.sleep(wait)
return values
finally:
self.release_lock()