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from qolab.hardware.basic import BasicInstrument
from qolab.hardware.rf_generator import RFGenerator
import serial
import re
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=False, **kwds):
super().__init__(*args, **kwds)
self.config['Device model'] = 'QOL made RF generator based on TI LMX2487 chip'
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
self.hopeFreeFreqJump = 100e3 # we break laser lock if Freq change is larger
self.hopeFree = True
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):
"""
Will do incremental hope free tuning to desired frequency,
if self.hopeFree is True.
RF generator itself is fine, but our laser looses lock without it.
"""
finished = False
while not finished:
frNow = self.getFreqFixed()
dF = freq-frNow
if dF >= 0:
dFSign = 1
else:
dFSign = -1
dF = abs(dF)
if dF <= self.hopeFreeFreqJump or not self.hopeFree:
fr = freq
finished = True
else:
fr = frNow + dFSign * self.hopeFreeFreqJump
self._FreqFixed = fr
cmd_str=f'setFreq({fr:.2f})'
self.sendSerialCmd(cmd_str)
@BasicInstrument.tsdb_append
def getFreqFixed(self):
# talking to hardware is slow, so we use cached value if we can
if self._FreqFixed is None:
resp = self.sendSerialCmd('getFreq()')
m = re.search('[0-9.]+', resp)
if m is not None:
self._FreqFixed = float(m.group())
return self._FreqFixed
if __name__ == '__main__':
import platform
if platform.system() == 'Linux':
rfgen=QOL_LMX2487(port='/dev/ttyUSB0', speed=115200, timeout=1)
else:
rfgen=QOL_LMX2487(port='COM4', speed=115200, timeout=1)
print("testing")
print('------ Header start -------------')
print(str.join('\n', rfgen.getHeader()))
print('------ Header ends -------------')
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