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#!/usr/bin/env python
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#-*- coding: utf-8 -*-
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"""Simple python library to drive the analog discovery module from www.digilentinc.com
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With Discoply addon connected https://hephaistos.lpp.polytechnique.fr/rhodecode/HG_REPOSITORIES/LPP/INSTRUMENTATION/PCB/DiscoPli
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"""
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from ctypes import *
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import time
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import sys
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import os
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import matplotlib.pyplot as plt
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import numpy as np
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from lppinstru import discovery
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__author__ = "Alexis Jeandet"
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__copyright__ = "Copyright 2015, Laboratory of Plasma Physics"
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__credits__ = []
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__license__ = "GPLv2"
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__version__ = "1.0.0"
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__maintainer__ = "Alexis Jeandet"
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__email__ = "alexis.jeandet@member.fsf.org"
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__status__ = "Production"
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class discoply(discovery.Discovery):
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_gains={
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"LTC-6910-1":[0, 1, 2, 5, 10, 20, 50, 100],
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"LTC-6910-2":[0, 1, 2, 4, 8, 16, 32, 64],
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"LTC-6910-3":[0, 1, 2, 3, 4, 5, 6, 7]
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}
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def __init__(self,card=-1,model="LTC-6910-1",gain_ch1=1,gain_ch2=1):
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super(discoply,self).__init__(card)
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self._model=model
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self.set_power()
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self.digital_io_output_enable(0x3F)
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self.gain_idx = [gain_ch1,gain_ch2]
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def auto_remove_offset(self,channel=0):
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out=0.0
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for i in range(10):
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self.analog_out_gen(shape="DC",offset=out)
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time.sleep(0.2)
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mean=super(discoply,self).analog_in_read(frequency=1e5,samplesCount=8192)[0][channel].mean()
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out+=-mean*14./self.gain[channel]
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return mean
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def analog_in_read(self,ch1=True,ch2=True,frequency=100000000,samplesCount=100,ch1range=5.0,ch2range=5.0,trigger=discovery.trigsrcNone):
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data=super(discoply,self).analog_in_read(ch1,ch2,frequency,samplesCount,ch1range,ch2range,trigger)
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if self.gain[0] !=0:
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data[0][0]=data[0][0]/self.gain[0]
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if self.gain[1] !=0:
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data[0][1]=data[0][1]/self.gain[1]
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return data
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@property
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def offset(self):
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data=super(discoply,self).analog_in_read(frequency=1e4,samplesCount=8192)[0]
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return [data[0].mean(),data[1].mean()]
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@property
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def gain(self):
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return [
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self._gains[self._model][self.gain_idx[0]],
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self._gains[self._model][self.gain_idx[1]]]
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@property
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def gain_idx(self):
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dio=self.digital_io
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return [dio&7,(dio>>3)&7]
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@gain_idx.setter
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def gain_idx(self,value):
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self.digital_io =(value[0]&7) + ((value[1]&7)<<3)
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def set_gain_idx(self,value,channel):
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gain = self.gain & ~(7 << [0,3][channel])
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self.gain_idx = gain + (value << [0,3][channel])
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if __name__ == '__main__':
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quit()
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