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from qolab.hardware.basic import BasicInstrument
from ._basic import RFGenerator
import serial
import re
import time
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.hopeFree = True
self.hopeFreeFreqJump = 100e3 # we break laser lock if Freq change is larger
self.dwellTime = 0.1 # needed for hope free setling
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):
"""Set frequency of RF signal.
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)
if not finished:
time.sleep(self.dwellTime)
@BasicInstrument.tsdb_append
def getFreqFixed(self):
"""Gets RF signal frequency.
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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