def write_4byte_data(self, data):
"""write all floats/ints to the serial port"""
if not self.data_port: return
if not self.data_port.isOpen(): return
if self.verb > 4: print('++ writing data to serial port:', data)
dstring = struct.pack('f'*len(data), *data)
if self.swap: UTIL.swap4(dstring)
if self.verb > 5: print('++ hex data to serial port:',
UTIL.data_to_hex_str(self.bytes_to_ord(dstring)))
self.data_port.write(dstring)
del(dstring)
return 0
def read_ints_from_socket(self, nvals):
"""try to read nvals (4-byte) integers from data socket,
possibly byte-swapping
return a list of integers (None on error)"""
if nvals <= 0: return []
data = self.read_nbytes_from_data_socket(nvals*4) # read all bytes
if not data:
if self.verb > 0: print("** failed to read %d int(s)" % nvals)
return None
# swap one value at a time
vals = []
if self.swap: UTIL.swap4(data)
vals = list(struct.unpack('i'*nvals,data))
del(data)
if self.verb > 3: print("++ read %d ints: %s" % (nvals, vals))
return vals