def write_i2c_block_data(self, addr, cmd, vals):
"""write_i2c_block_data(addr, cmd, vals)
Perform I2C Block Write transaction.
"""
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
list_to_smbus_data(data, vals)
if SMBUS.i2c_smbus_access(self._fd, int2byte(SMBUS.I2C_SMBUS_WRITE),
ffi.cast("__u8", cmd),
SMBUS.I2C_SMBUS_I2C_BLOCK_BROKEN, data):
raise IOError(ffi.errno)
def block_process_call(self, addr, cmd, vals):
"""block_process_call(addr, cmd, vals) -> results
Perform SMBus Block Process Call transaction.
"""
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
list_to_smbus_data(data, vals)
if SMBUS.i2c_smbus_access(self._fd, SMBUS.I2C_SMBUS_WRITE,
ffi.cast("__u8", cmd),
SMBUS.I2C_SMBUS_BLOCK_PROC_CALL, data):
raise IOError(ffi.errno)
return smbus_data_to_list(data)
def write_i2c_block_data(self, addr, cmd, vals):
"""write_i2c_block_data(addr, cmd, vals)
Perform I2C Block Write transaction.
"""
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
list_to_smbus_data(data, vals)
if SMBUS.i2c_smbus_access(self._fd,
int2byte(SMBUS.I2C_SMBUS_WRITE),
ffi.cast("__u8", cmd),
SMBUS.I2C_SMBUS_I2C_BLOCK_BROKEN,
data):
raise IOError(ffi.errno)
def block_process_call(self, addr, cmd, vals):
"""block_process_call(addr, cmd, vals) -> results
Perform SMBus Block Process Call transaction.
"""
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
list_to_smbus_data(data, vals)
if SMBUS.i2c_smbus_access(self._fd, SMBUS.I2C_SMBUS_WRITE,
ffi.cast("__u8", cmd),
SMBUS.I2C_SMBUS_BLOCK_PROC_CALL,
data):
raise IOError(ffi.errno)
return smbus_data_to_list(data)
def read_block_data(self, addr, cmd):
"""read_block_data(addr, cmd) -> results
Perform SMBus Read Block Data transaction.
"""
# XXX untested, the raspberry pi i2c driver does not support this
# command
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
if SMBUS.i2c_smbus_access(self._fd, int2byte(SMBUS.I2C_SMBUS_READ),
ffi.cast("__u8", cmd),
SMBUS.I2C_SMBUS_BLOCK_DATA, data):
raise IOError(ffi.errno)
return smbus_data_to_list(data)
def read_block_data(self, addr, cmd):
"""read_block_data(addr, cmd) -> results
Perform SMBus Read Block Data transaction.
"""
# XXX untested, the raspberry pi i2c driver does not support this
# command
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
if SMBUS.i2c_smbus_access(self._fd,
int2byte(SMBUS.I2C_SMBUS_READ),
ffi.cast("__u8", cmd),
SMBUS.I2C_SMBUS_BLOCK_DATA,
data):
raise IOError(ffi.errno)
return smbus_data_to_list(data)
def read_i2c_block_data(self, addr, cmd, len=32):
"""read_i2c_block_data(addr, cmd, len=32) -> results
Perform I2C Block Read transaction.
"""
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
data.block[0] = len
if len == 32:
arg = SMBUS.I2C_SMBUS_I2C_BLOCK_BROKEN
else:
arg = SMBUS.I2C_SMBUS_I2C_BLOCK_DATA
if SMBUS.i2c_smbus_access(self._fd, int2byte(SMBUS.I2C_SMBUS_READ),
ffi.cast("__u8", cmd), arg, data):
raise IOError(ffi.errno)
return smbus_data_to_list(data)
def read_i2c_block_data(self, addr, cmd, len=32):
"""read_i2c_block_data(addr, cmd, len=32) -> results
Perform I2C Block Read transaction.
"""
self._set_addr(addr)
data = ffi.new("union i2c_smbus_data *")
data.block[0] = len
if len == 32:
arg = SMBUS.I2C_SMBUS_I2C_BLOCK_BROKEN
else:
arg = SMBUS.I2C_SMBUS_I2C_BLOCK_DATA
if SMBUS.i2c_smbus_access(self._fd,
int2byte(SMBUS.I2C_SMBUS_READ),
ffi.cast("__u8", cmd),
arg, data):
raise IOError(ffi.errno)
return smbus_data_to_list(data)