def __read_reg(cls, addr):
try:
I2C.start_tx(cls.__ADDR)
value = I2C.read_cmd(addr, 1)
finally:
I2C.end_tx()
return value
def __read_image(cls, memory_addr, count):
try:
I2C.start_tx(Host.DFE_EEPROM_ADDR)
content = I2C.read_cmd(memory_addr, count)
return EEPROMImage(content)
finally:
I2C.end_tx()
def __read_raw(self):
try:
I2C.start_tx(self.__I2C_ADDR)
values = I2C.read_cmd(self.__reg_addr, 2)
return values[0] << 8 | values[1]
finally:
I2C.end_tx()
def __read_config(self):
try:
I2C.start_tx(self.__addr)
msb, lsb = I2C.read_cmd(ADS1115.__REG_CONFIG, 2)
finally:
I2C.end_tx()
config = (msb << 8) | lsb
return config
def __read_temp(cls):
try:
I2C.start_tx(cls.__ADDR)
msb, lsb = I2C.read_cmd(cls.__REG_TEMP, 2)
finally:
I2C.end_tx()
# render voltage...
unsigned_c = float(msb & 0x1f) * 16 + float(lsb) / 16
sign = msb & 0x10
temp = 256 - unsigned_c if sign else unsigned_c
return temp
def __read_array(cls, device_addr, memory_addr, count):
try:
I2C.start_tx(Host.DFE_UID_ADDR)
# I2C.read(1)
finally:
I2C.end_tx()
try:
I2C.start_tx(Host.DFE_UID_ADDR)
# I2C.write(0x80)
return I2C.read_cmd(0x80, count) # memory_addr,
finally:
I2C.end_tx()
def __read_conv(self):
try:
I2C.start_tx(self.__addr)
msb, lsb = I2C.read_cmd(ADS1115.__REG_CONV, 2)
finally:
I2C.end_tx()
# render voltage...
unsigned = (msb << 8) | lsb
# print("unsigned: 0x%04x" % unsigned)
signed = struct.unpack('h', struct.pack('H', unsigned))
v = (signed[0] / 32767.5) * ADS1115.__FULL_SCALE[self.__gain]
return v