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from qolab.hardware.basic import BasicInstrument
import serial
class QOL_LMX2487(RFGenerator):
"""
QOL lab made RF generator based on TI LMX2487 chip.
The communication with RF generator is done via nodeMCU controlling esp2866 chip.
"""
def __init__(self, *args, port='/dev/ttyUSB0', speed=115200, timeout=1, setToDefaults=True, **kwds):
super().__init__(*args, **kwds)
self.port = port
self.speed = speed
self.timeout = timeout
self.connection = serial.Serial( self.port, self.speed, timeout=self.timeout)
self.log = []
self.logCapacity = 10
self._FreqFixed = None
if setToDefaults:
self.sendSerialCmd("set_lmx2487_board_to_default_state()")
def add2log(self, text):
self.log.append(text)
while len(self.log) > self.logCapacity:
self.log.pop(0)
def log2str(self, interval=None):
strOut = ""
for e in self.log:
strOut += e
return strOut
def sendSerialCmd(self, cmd):
self.connection.write(bytes(cmd+'\r','ascii'))
if "3.4" == serial.__version__:
# older version style
resp = self.connection.read_until(terminator=b'> ')
else:
# new style after 20180616
resp = self.connection.read_until(expected=b'> ')
resp = resp.decode('utf-8')
self.add2log(resp)
return resp
@BasicInstrument.tsdb_append
def setFreqFixed(self,freq):
self._FreqFixed = freq
cmd_str=f'setFreq({freq:.2f})'
self.sendSerialCmd(cmd_str)
@BasicInstrument.tsdb_append
def getFreqFixed(self):
"""
getFreqFixed unable to get frequency from hardware.
So we use value from previews setFreqFixed.
"""
return self._FreqFixed
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