def set_values(self, block_name, address, values):
"""
Set the values of the items at the given address
If values is a list or a tuple, the value of every item is written
If values is a number, only one value is written
"""
# thread safe
with self._data_lock:
block = self._get_block(block_name)
# the block has been found
# check that it doesn't write out of the block
offset = address-block.starting_address
size = 1
if isinstance(values, list) or isinstance(values, tuple):
size = len(values)
if (offset < 0) or ((offset + size) > block.size):
raise OutOfModbusBlockError(
"address {0} size {1} is out of block {2}".format(address, size, block_name)
)
# if Ok: write the values
if isinstance(values, list) or isinstance(values, tuple):
block[offset:offset+len(values)] = values
else:
block[offset] = values
def get_values(self, block_name, address, size=1):
"""
return the values of n items at the given address of the given block
"""
# thread safe
with self._data_lock:
block = self._get_block(block_name)
# the block has been found
# check that it doesn't write out of the block
offset = address - block.starting_address
if (offset < 0) or ((offset + size) > block.size):
raise OutOfModbusBlockError(
"address %s size {0} is out of block {1}".format(address, size, block_name)
)
# returns the values
if size == 1:
return tuple([block[offset], ])
else:
return tuple(block[offset:offset+size])
