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LVPM.py
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import platform
import usb.core
import usb.util
import struct
from Monsoon import Operations as op
import numpy as np
from Monsoon import pmapi
class Monsoon(object):
def __init__(self, *args, **kwargs):
self.DEVICE = None
self.DEVICE_TYPE = None
self.epBulkWriter = None
self.epBulkReader = None
self.Protocol = None
self.statusPacket = op.statusPacket
self.fineThreshold = 30000
self.auxFineThreshold = 30000
self.mainvoltageScale = 2
self.usbVoltageScale = 2
self.ADCRatio = (float)(62.5 / 1e6); #Each tick of the ADC represents this much voltage
self.factoryRes = 0.050
self.auxFactoryResistor = 0.1
self.__padding = np.zeros(64)
pass
def enumerateDevices(self):
temp = pmapi.USB_protocol()
return temp.enumerateDevices()
def closeDevice(self):
self.Protocol.closeDevice();
def setup_usb(self, serialno = None, Protocol=pmapi.USB_protocol()):
Protocol.Connect(op.HardwareModel.LVPM,serialno)
self.Protocol = Protocol
def amps_from_raw(self,raw):
"""Translate EEPROM overcurrent protection value setting into amps."""
raw = min(raw,1023)
result = 8.0*(1.0-(raw/1023.0))
return result
def raw_from_amps(self,amps):
"""Translate amp setting for overcurrent protection into EEPROM value"""
result = 1023 * (1.0 - (amps/8.0))
return result
def setVout(self,value):
"""Set Vout. Valid values from 2.01-4.55. 0 = turn off."""
if(value > 2.00 and value < 4.56 or value == 0):
vout = value * op.Conversion.FLOAT_TO_INT
self.Protocol.sendCommand(op.OpCodes.setMainVoltage,vout)
else:
raise Exception("Invalid Voltage value")
def setPowerupTime(self,value):
"""time in ms where powerupcurrentlimit applies, vs runtimecurrentlimit"""
self.Protocol.sendCommand(op.OpCodes.setPowerupTime,value)
def setPowerUpCurrentLimit(self, value):
"""Sets power up current limit. Valid values are 0-8 Amps"""
value = self.__raw_from_amps(value)
self.Protocol.sendCommand(op.OpCodes.SetPowerUpCurrentLimit,value)
def setRunTimeCurrentLimit(self, value):
"""Sets runtime current limit. Valid values are 0-8 amps."""
value = self.__raw_from_amps(value)
self.Protocol.sendCommand(op.OpCodes.SetRunCurrentLimit,value)
def setUSBCoarseZeroOffset(self,value):
"""Zero offset, not used in LVPM"""
self.Protocol.sendCommand(op.OpCodes.SetUSBCoarseZeroOffset,value)
def setUSBPassthroughMode(self, USBPassthroughCode):
"""USB Passthrough mode. 0 = off, 1 = on, 2 = auto"""
self.Protocol.sendCommand(op.OpCodes.setUsbPassthroughMode,USBPassthroughCode)
def setVoltageChannel(self, VoltageChannelCode):
"""Sets voltage measurement channel. 0 = Main & USB, 1 = Main & Aux"""
self.Protocol.sendCommand(op.OpCodes.setVoltageChannel,VoltageChannelCode)
def getVoltageChannel(self):
"""0 = Main & USB, 1 = Main & Aux"""
return(self.Protocol.getValue(op.OpCodes.setVoltageChannel,1))
def getSerialNumber(self):
"""Get the device serial number"""
serialNumber = self.Protocol.getValue(op.OpCodes.getSerialNumber,2)
return serialNumber
def setDefaultScaleValues(self):
"""Not implemented for LVPM yet"""
raise NotImplementedError
def fillStatusPacket(self):
"""Get all calibration information from the device EEPROM"""
#Misc Status information.
self.statusPacket.firmwareVersion = self.Protocol.getValue(op.OpCodes.FirmwareVersion,2)
self.statusPacket.protocolVersion = self.Protocol.getValue(op.OpCodes.ProtocolVersion,1)
self.statusPacket.temperature = -1 #Not currently supported.
self.statusPacket.serialNumber = self.Protocol.getValue(op.OpCodes.getSerialNumber,2)
self.statusPacket.powerupCurrentLimit = self.amps_from_raw(self.Protocol.getValue(op.OpCodes.SetPowerUpCurrentLimit,2))
self.statusPacket.runtimeCurrentLimit = self.amps_from_raw(self.Protocol.getValue(op.OpCodes.SetRunCurrentLimit,2))
self.statusPacket.powerupTime = self.Protocol.getValue(op.OpCodes.setPowerupTime,1)
self.statusPacket.usbPassthroughMode = self.Protocol.getValue(op.OpCodes.setUsbPassthroughMode,1)
self.statusPacket.hardwareModel = self.Protocol.getValue(op.OpCodes.HardwareModel,2)
#Calibration data
self.statusPacket.mainFineResistorOffset = float(self.Protocol.getValue(op.OpCodes.setMainFineResistorOffset,1))
mainFineResistor = self.factoryRes + self.statusPacket.mainFineResistorOffset * 0.0001
self.statusPacket.mainCoarseResistorOffset = float(self.Protocol.getValue(op.OpCodes.setMainCoarseResistorOffset,1))
mainCoarseResistor = self.factoryRes + self.statusPacket.mainCoarseResistorOffset * 0.0001
self.statusPacket.usbFineResistorOffset = float(self.Protocol.getValue(op.OpCodes.setUsbFineResistorOffset,1))
usbFineResistor = self.factoryRes + self.statusPacket.usbFineResistorOffset * 0.0001
self.statusPacket.usbCoarseResistorOffset = float(self.Protocol.getValue(op.OpCodes.setUsbCoarseResistorOffset,1))
usbCoarseResistor = self.factoryRes + self.statusPacket.usbCoarseResistorOffset * 0.0001
self.statusPacket.auxFineResistorOffset = float(self.Protocol.getValue(op.OpCodes.setAuxFineResistorOffset,1))
auxFineResistor = self.auxFactoryResistor + self.statusPacket.auxFineResistorOffset * 0.0001
self.statusPacket.auxCoarseResistorOffset = float(self.Protocol.getValue(op.OpCodes.setAuxCoarseResistorOffset,1))
auxCoarseResistor = self.auxFactoryResistor + self.statusPacket.auxCoarseResistorOffset * 0.0001
#LVPM Scaling system.
self.statusPacket.mainFineScale = 35946.0 * (self.factoryRes / mainFineResistor)
self.statusPacket.mainCoarseScale = 3103.4 * (self.factoryRes / mainCoarseResistor)
self.statusPacket.usbFineScale = 35946.0 * (self.factoryRes / usbFineResistor)
self.statusPacket.usbCoarseScale = 3103.4 * (self.factoryRes / usbCoarseResistor)
self.statusPacket.auxFineScale = 0.05049 * (self.auxFactoryResistor / auxFineResistor)
self.statusPacket.auxCoarseScale = 1.289 * (self.auxFactoryResistor / auxCoarseResistor)
#LVPM units don't use zero offset information.
self.statusPacket.mainFineZeroOffset = 0
self.statusPacket.mainCoarseZeroOffset = 0
self.statusPacket.usbFineZeroOffset = 0
self.statusPacket.usbCoarseZeroOffset = 0
def StartSampling(self,calTime=1250,maxTime=0xFFFFFFFF):
self.fillStatusPacket()
self.Protocol.startSampling(calTime,maxTime)
def stopSampling(self):
self.Protocol.stopSampling()
#ctrl_transfer(bmRequestType, bmRequest, wValue, wIndex)
def BulkRead(self):
"""Read sample packets.
Returns an array of 64 byte packets concatenated together.
Number of packets depends on the protocol selected."""
return self.Protocol.BulkRead()
def swizzlePacket(self, packet):
"""Byte order for 2-byte values is swapped for the majority of the measurement packet. This fixes that."""
length = len(packet)
packet = np.array(packet)
evenBytes = packet[4::2]
oddBytes = packet[5::2]
swizzledBytes = np.insert(evenBytes,np.arange(len(oddBytes)),oddBytes)
swizzledPacket = np.hstack([packet[0:4],swizzledBytes[:],self.__padding[0:(58-length)]])
swizzledPacket = np.array(swizzledPacket).astype('b')
swizzledPacket = swizzledPacket[0:58]
packetLength = len(swizzledPacket)
rawBytes = struct.pack('b'*packetLength,*swizzledPacket)
measurements = struct.unpack("HBBhhhhhhHHBBhhhhhhHHBBhhhhhhHHBB",rawBytes)
measurements = list(measurements)
return measurements
def Reconnect(self):
self.Protocol.reconnect(op.HardwareModel.LVPM,self.statusPacket.serialNumber)
def resetToBootloader(self):
#Generally not supported by LVPM units.
self.Protocol.resetToBootloader()