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import time
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import smbus
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class DFRobot_AS3935:
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def __init__(self, address, bus = 1):
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self.address = address
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self.i2cbus = smbus.SMBus(bus)
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def writeByte(self, register, value):
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try:
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self.i2cbus.write_byte_data(self.address, register, value)
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return 1
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except:
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return 0
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def readData(self, register):
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self.register = self.i2cbus.read_i2c_block_data(self.address, register)
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def manualCal(self, capacitance, location, disturber):
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self.powerUp()
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if location == 1:
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self.setIndoors()
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else:
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self.setOutdoors()
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if disturber == 0:
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self.disturberDis()
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else:
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self.disturberEn()
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self.setIrqOutputSource(0)
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time.sleep(0.5)
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self.setTuningCaps(capacitance)
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def setTuningCaps(self, capVal):
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#Assume only numbers divisible by 8 (because that's all the chip supports)
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if capVal > 120: #cap_value out of range, assume highest capacitance
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self.singRegWrite(0x08, 0x0F, 0x0F) #set capacitance bits to maximum
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else:
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self.singRegWrite(0x08, 0x0F, capVal >> 3) #set capacitance bits
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self.singRegRead(0x08)
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#print('capacitance set to 8x%d'%(self.register[0] & 0x0F))
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def powerUp(self):
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#register 0x00, PWD bit: 0 (clears PWD)
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self.singRegWrite(0x00, 0x01, 0x00)
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self.calRCO() #run RCO cal cmd
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self.singRegWrite(0x08, 0x20, 0x20) #set DISP_SRCO to 1
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time.sleep(0.002)
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self.singRegWrite(0x08, 0x20, 0x00) #set DISP_SRCO to 0
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def powerDown(self):
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#register 0x00, PWD bit: 0 (sets PWD)
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self.singRegWrite(0x00, 0x01, 0x01)
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def calRCO(self):
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self.writeByte(0x3D, 0x96)
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time.sleep(0.002)
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def setIndoors(self):
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self.singRegWrite(0x00, 0x3E, 0x24)
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print("set to indoors model")
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def setOutdoors(self):
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self.singRegWrite(0x00, 0x3E, 0x1C)
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print("set to outdoors model")
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def disturberDis(self):
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#register 0x03, PWD bit: 5 (sets MASK_DIST)
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self.singRegWrite(0x03, 0x20, 0x20)
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print("disenable disturber detection")
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def disturberEn(self):
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#register 0x03, PWD bit: 5 (sets MASK_DIST)
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self.singRegWrite(0x03, 0x20, 0x00)
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print("enable disturber detection")
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def singRegWrite(self, regAdd, dataMask, regData):
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#start by reading original register data (only modifying what we need to)
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self.singRegRead(regAdd)
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#calculate new register data... 'delete' old targeted data, replace with new data
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#note: 'dataMask' must be bits targeted for replacement
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#add'l note: this function does NOT shift values into the proper place... they need to be there already
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newRegData = (self.register[0] & ~dataMask)|(regData & dataMask)
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#finally, write the data to the register
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self.writeByte(regAdd, newRegData)
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#print('wrt: %02x'%newRegData)
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self.singRegRead(regAdd)
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#print('Act: %02x'%self.register[0])
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def singRegRead(self,regAdd):
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self.readData(regAdd)
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def getInterruptSrc(self):
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#definition of interrupt data on table 18 of datasheet
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#for this function:
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#0 = unknown src, 1 = lightning detected, 2 = disturber, 3 = Noise level too high
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time.sleep(0.03) #wait 3ms before reading (min 2ms per pg 22 of datasheet)
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self.singRegRead(0x03) #read register, get rid of non-interrupt data
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intSrc = self.register[0]&0x0F
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if intSrc == 0x08:
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return 1 #lightning caused interrupt
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elif intSrc == 0x04:
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return 2 #disturber detected
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elif intSrc == 0x01:
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return 3 #Noise level too high
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else:
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return 0 #interrupt result not expected
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def reset(self):
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err = self.writeByte(0x3C, 0x96)
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time.sleep(0.002) #wait 2ms to complete
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return err
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def setLcoFdiv(self,fdiv):
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self.singRegWrite(0x03, 0xC0, (fdiv & 0x03) << 6)
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def setIrqOutputSource(self, irqSelect):
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#set interrupt source - what to display on IRQ pin
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#reg 0x08, bits 5 (TRCO), 6 (SRCO), 7 (LCO)
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#only one should be set at once, I think
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#0 = NONE, 1 = TRCO, 2 = SRCO, 3 = LCO
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if irqSelect == 1:
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self.singRegWrite(0x08, 0xE0, 0x20) #set only TRCO bit
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elif irqSelect == 2:
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self.singRegWrite(0x08, 0xE0, 0x40) #set only SRCO bit
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elif irqSelect == 3:
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self.singRegWrite(0x08, 0xE0, 0x80) #set only SRCO bit
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else:
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self.singRegWrite(0x08, 0xE0, 0x00) #clear IRQ pin display bits
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def getLightningDistKm(self):
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self.singRegRead(0x07) #read register, get rid of non-distance data
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return self.register[0]&0x3F
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def getStrikeEnergyRaw(self):
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self.singRegRead(0x06) #MMSB, shift 8 bits left, make room for MSB
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nrgyRaw = (self.register[0]&0x1F) << 8
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self.singRegRead(0x05) #read MSB
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nrgyRaw |= self.register[0]
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nrgyRaw <<= 8 #shift 8 bits left, make room for LSB
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self.singRegRead(0x04) #read LSB, add to others
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nrgyRaw |= self.register[0]
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return nrgyRaw/16777
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def setMinStrikes(self, minStrk):
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#This function sets min strikes to the closest available number, rounding to the floor,
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#where necessary, then returns the physical value that was set. Options are 1, 5, 9 or 16 strikes.
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if minStrk < 5:
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self.singRegWrite(0x02, 0x30, 0x00)
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return 1
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elif minStrk < 9:
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self.singRegWrite(0x02, 0x30, 0x10)
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return 5
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elif minStrk < 16:
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self.singRegWrite(0x02, 0x30, 0x20)
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return 9
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else:
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self.singRegWrite(0x02, 0x30, 0x30)
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return 16
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def clearStatistics(self):
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#clear is accomplished by toggling CL_STAT bit 'high-low-high' (then set low to move on)
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self.singRegWrite(0x02, 0x40, 0x40) #high
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self.singRegWrite(0x02, 0x40, 0x00) #low
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self.singRegWrite(0x02, 0x40, 0x40) #high
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def getNoiseFloorLv1(self):
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#NF settings addres 0x01, bits 6:4
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#default setting of 010 at startup (datasheet, table 9)
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self.singRegRead(0x01) #read register 0x01
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return (self.register[0] & 0x70) >> 4 #should return value from 0-7, see table 16 for info
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def setNoiseFloorLv1(self, nfSel):
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#NF settings addres 0x01, bits 6:4
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#default setting of 010 at startup (datasheet, table 9)
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if nfSel <= 7: #nfSel within expected range
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self.singRegWrite(0x01, 0x70, (nfSel & 0x07) << 4)
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else: #out of range, set to default (power-up value 010)
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self.singRegWrite(0x01, 0x70, 0x20)
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def getWatchdogThreshold(self):
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#This function is used to read WDTH. It is used to increase robustness to disturbers,
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#though will make detection less efficient (see page 19, Fig 20 of datasheet)
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#WDTH register: add 0x01, bits 3:0
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#default value of 0010
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#values should only be between 0x00 and 0x0F (0 and 7)
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self.singRegRead(0x01)
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return self.register[0] & 0x0F
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def setWatchdogThreshold(self, wdth):
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#This function is used to modify WDTH. It is used to increase robustness to disturbers,
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#though will make detection less efficient (see page 19, Fig 20 of datasheet)
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#WDTH register: add 0x01, bits 3:0
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#default value of 0001
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#values should only be between 0x00 and 0x0F (0 and 7)
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self.singRegWrite(0x01, 0x0F, wdth & 0x0F)
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def getSpikeRejection(self):
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#This function is used to read SREJ (spike rejection). Similar to the Watchdog threshold,
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#it is used to make the system more robust to disturbers, though will make general detection
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#less efficient (see page 20-21, especially Fig 21 of datasheet)
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#SREJ register: add 0x02, bits 3:0
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#default value of 0010
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#values should only be between 0x00 and 0x0F (0 and 7)
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self.singRegRead(0x02)
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return self.register[0] & 0x0F
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def setSpikeRejection(self, srej):
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#This function is used to modify SREJ (spike rejection). Similar to the Watchdog threshold,
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#it is used to make the system more robust to disturbers, though will make general detection
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#less efficient (see page 20-21, especially Fig 21 of datasheet)
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#WDTH register: add 0x02, bits 3:0
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#default value of 0010
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#values should only be between 0x00 and 0x0F (0 and 7)
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self.singRegWrite(0x02, 0x0F, srej & 0x0F)
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def printAllRegs(self):
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self.singRegRead(0x00)
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print("Reg 0x00: %02x"%self.register[0])
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self.singRegRead(0x01)
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print("Reg 0x01: %02x"%self.register[0])
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self.singRegRead(0x02)
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print("Reg 0x02: %02x"%self.register[0])
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self.singRegRead(0x03)
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print("Reg 0x03: %02x"%self.register[0])
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self.singRegRead(0x04)
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print("Reg 0x04: %02x"%self.register[0])
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self.singRegRead(0x05)
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print("Reg 0x05: %02x"%self.register[0])
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self.singRegRead(0x06)
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print("Reg 0x06: %02x"%self.register[0])
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self.singRegRead(0x07)
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print("Reg 0x07: %02x"%self.register[0])
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self.singRegRead(0x08)
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print("Reg 0x08: %02x"%self.register[0])
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