def read(self, length, config=I2CConfig.AA_I2C_NO_FLAGS):
'''read 1 byte from slave address
'''
# read 1 byte each time for easy
# length = 2
ata_in = array_u08(length)
(ret, num_read) = api.py_aa_i2c_read_ext(self.handle, self.slave_addr,
config, length, ata_in)
if (ret != 0):
api.py_aa_i2c_free_bus(self.handle)
raise_i2c_ex(ret)
if (num_read != length):
raise_aa_ex(-102)
val = ata_in
return val
def read(self, length, config=I2CConfig.AA_I2C_NO_FLAGS):
'''read 1 byte from slave address
'''
# read 1 byte each time for easy
# length = 2
ata_in = array_u08(length)
(ret, num_read) = api.py_aa_i2c_read_ext(self.handle,
self.slave_addr,
config,
length,
ata_in)
if(ret != 0):
api.py_aa_i2c_free_bus(self.handle)
raise_i2c_ex(ret)
if(num_read != length):
raise_aa_ex(-102)
val = ata_in
return val
def write(self, wata, config=I2CConfig.AA_I2C_NO_FLAGS):
'''write ata to slave address
ata can be byte or array of byte
'''
if (type(wata) == int):
ata_out = array('B', [wata])
length = 1
elif (type(wata) == list):
ata_out = array('B', wata)
length = len(wata)
else:
raise TypeError("i2c ata to be written is not valid")
(ret, num_written) = api.py_aa_i2c_write_ext(self.handle,
self.slave_addr, config,
length, ata_out)
if (ret != 0):
api.py_aa_i2c_free_bus(self.handle)
raise_i2c_ex(ret)
if (num_written != length):
raise_aa_ex(-103)
def write(self, wata, config=I2CConfig.AA_I2C_NO_FLAGS):
'''write ata to slave address
ata can be byte or array of byte
'''
if(type(wata) == int):
ata_out = array('B', [wata])
length = 1
elif(type(wata) == list):
ata_out = array('B', wata)
length = len(wata)
else:
raise TypeError("i2c ata to be written is not valid")
(ret, num_written) = api.py_aa_i2c_write_ext(self.handle,
self.slave_addr,
config,
length,
ata_out)
if(ret != 0):
api.py_aa_i2c_free_bus(self.handle)
raise_i2c_ex(ret)
if(num_written != length):
raise_aa_ex(-103)
def open(self, portnum=None, serialnumber=None):
'''
find ports, and open the port with portnum or sn,
config the aardvark tool params like bitrate, slave address etc,
'''
ports = self.find_devices()
logging.debug("find ports: " + str(ports))
self.port = None
if(serialnumber):
for port in ports:
handle = api.py_aa_open(port)
if(api.py_aa_unique_id(handle) == serialnumber):
logging.debug("SN: " + str(api.py_aa_unique_id(handle)))
self.port = port
api.py_aa_close(handle)
break
api.py_aa_close(handle)
if(self.port is None):
raise_aa_ex(-601)
elif(portnum):
self.port = portnum
else:
self.port = 0
logging.debug("open: " + str(self.port))
self.handle = api.py_aa_open(self.port)
if(self.handle <= 0):
raise_aa_ex(self.handle)
# Ensure that the I2C subsystem is enabled
api.py_aa_configure(self.handle, I2CConfig.AA_CONFIG_SPI_I2C)
api.py_aa_i2c_pullup(self.handle, I2CConfig.AA_I2C_PULLUP_BOTH)
api.py_aa_target_power(self.handle, I2CConfig.AA_TARGET_POWER_NONE)
# Set the bitrate, in khz
self.bitrate = api.py_aa_i2c_bitrate(self.handle, self.bitrate)
# Set the bus lock timeout, in ms
api.py_aa_i2c_bus_timeout(self.handle, self.bus_timeout)
# Free bus
api.py_aa_i2c_free_bus(self.handle)
def open(self, portnum=None, serialnumber=None):
'''
find ports, and open the port with portnum or sn,
config the aardvark tool params like bitrate, slave address etc,
'''
ports = self.find_devices()
logging.debug("find ports: " + str(ports))
self.port = None
if (serialnumber):
for port in ports:
handle = api.py_aa_open(port)
if (api.py_aa_unique_id(handle) == serialnumber):
logging.debug("SN: " + str(api.py_aa_unique_id(handle)))
self.port = port
api.py_aa_close(handle)
break
api.py_aa_close(handle)
if (self.port is None):
raise_aa_ex(-601)
elif (portnum):
self.port = portnum
else:
self.port = 0
logging.debug("open: " + str(self.port))
self.handle = api.py_aa_open(self.port)
if (self.handle <= 0):
raise_aa_ex(self.handle)
# Ensure that the I2C subsystem is enabled
api.py_aa_configure(self.handle, I2CConfig.AA_CONFIG_SPI_I2C)
api.py_aa_i2c_pullup(self.handle, I2CConfig.AA_I2C_PULLUP_BOTH)
api.py_aa_target_power(self.handle, I2CConfig.AA_TARGET_POWER_NONE)
# Set the bitrate, in khz
self.bitrate = api.py_aa_i2c_bitrate(self.handle, self.bitrate)
# Set the bus lock timeout, in ms
api.py_aa_i2c_bus_timeout(self.handle, self.bus_timeout)
# Free bus
api.py_aa_i2c_free_bus(self.handle)
def aa_i2c_free_bus (aardvark):
"""usage: int return = aa_i2c_free_bus(Aardvark aardvark)"""
if not AA_LIBRARY_LOADED: return AA_INCOMPATIBLE_LIBRARY
# Call API function
return api.py_aa_i2c_free_bus(aardvark)
def aa_i2c_free_bus (aardvark):
"""usage: int return = aa_i2c_free_bus(Aardvark aardvark)"""
if not AA_LIBRARY_LOADED: return AA_INCOMPATIBLE_LIBRARY
# Call API function
return api.py_aa_i2c_free_bus(aardvark)
