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THERMOplate.py
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THERMOplate.py
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import spidev
import time
import string
import site
import sys
import math
from numbers import Number
import RPi.GPIO as GPIO
from six.moves import input as raw_input
GPIO.setwarnings(False)
#Initialize
if (sys.version_info < (2,7,0)):
sys.stderr.write("You need at least python 2.7.0 to use this library")
exit(1)
GPIO.setmode(GPIO.BCM)
THERMObaseADDR=40
ppFRAME = 25
ppINT = 22
ppACK = 23
GPIO.setup(ppFRAME,GPIO.OUT)
GPIO.output(ppFRAME,False) #Initialize FRAME signal
time.sleep(.001) #let Pi-Plate reset SPI engine if necessary
GPIO.setup(ppINT, GPIO.IN, pull_up_down=GPIO.PUD_UP) #Initialize SRQ input and ACK
GPIO.setup(ppACK, GPIO.IN, pull_up_down=GPIO.PUD_UP)
spi = spidev.SpiDev()
spi.open(0,1)
localPath=site.getsitepackages()[0]
helpPath=localPath+'/piplates/THERMOhelp.txt'
#helpPath='THERMOhelp.txt' #for development only
THERMOversion=1.3
#1.0 - initial release
#1.1 - added line frequency options
#1.2 - added data smoothing options
#1.3 - fixed coefficients in type K conversion polynomial for T>500C.
DataGood=False
#tType='k' #Default thermocouple is type K
RMAX = 2000
MAXADDR=8
kTc=[[0 for z in range(3)] for x in range(10)] #Type K thermocouple coefficients. Found at: https://www.keysight.com/upload/cmc_upload/All/5306OSKR-MXD-5501-040107_2.htm?&&cc=HK&lc=eng
#kTc[n]=[c0, c1, c2, c3, c4, c5, c6, c7, c8, c9]
kTc[0]=[0,2.5173462E01,-1.1662878,-1.0833638,-8.9773540E-01,-3.7342377E-01,-8.6632643E-02,-1.0450598E-02,-5.1920577E-04,0]
kTc[1]=[0,2.508355E01,7.860106E-02,-2.503131E-01,8.315270E-02,-1.228034E-02,9.804036E-04,-4.413030E-05,1.0577340E-06,-1.052755E-08]
kTc[2]=[-1.318058E02,4.830222E01,-1.646031,5.464731E-02,-9.650715E-04,8.802193E-06,-3.110810E-08,0,0,0]
# Voltage: -5.891 mV to 0 mV 0 mV to 20.644 mV 20.644 to 54.886mV
# Temperature: -200C to 0C 0C to 500C 500C to 1372C
# Coefficient Index: 0 1 3
#Coefficients to convert temperature to Type K voltage (in millivolts)
kTcj=[-1.7600413686E-02, 3.8921204975E-02, 1.8558770032E-05, -9.9457592874E-08, 3.1840945719E-10, -5.6072844889E-13, 5.6075059059E-16, -3.2020720003E-19, 9.7151147152E-23, -1.2104721275E-26]
jTc=[[0 for z in range(3)] for x in range(9)] #Type J thermocouple coefficients. Found at: https://www.keysight.com/upload/cmc_upload/All/5306OSKR-MXD-5501-040106_2.htm
#jTc[n]=[c0, c1, c2, c3, c4, c5, c6, c7, c8]
jTc[0]=[0,1.9528268E1,-1.2286185,-1.0752178,-5.9086933E-01,-1.7256713E-01,-2.8131513E-02,-2.3963370E-03,-8.3823321E-05]
jTc[1]=[0,1.978425E01,-2.001204E-01,1.036969E-02,-2.549687E-04,3.585153E-06,-5.344285E-08,5.099890E-10,0]
jTc[2]=[-3.1135818702E03,3.00543684E02,-9.94773230,1.70276630E-01,-1.43033468E-03,4.73886084E-06,0,0,0]
# Voltage: -8.095 mV to 0 mV 0 mV to 42.919 mV 42.919 to 54.00mV
# Temperature: -210C to 0C 0C to 760C 760C to 934C
# Coefficient Index: 0 1 3
#Coefficients to convert temperature to Type J voltage (in millivolts)
jTcj=[0, 5.0381187815E-02, 3.0475836930E-05, -8.5681065720E-08, 1.3228195295E-10, -1.7052958337E-13, 2.0948090697E-16, -1.2538395336E-19, 1.5631725697E-23]
#Global Declarations
THERMOsPresent = list(range(8))
calScale=[[0 for z in range(8)] for x in range(8)] #24 bit floating point slope calibration values
calOffset=[[0 for z in range(8)] for x in range(8)] #24 bit floating point offset calibration values
calBias=[0,0,0,0,0,0,0,0]
calSet=list(range(8))
tempScale='c'
tType=[['k' for z in range(8)] for x in range(8)] #Default thermocouple is type K
def CLOSE():
spi.close()
GPIO.cleanup()
def Help():
help()
def HELP():
help()
def help():
valid=True
try:
f=open(helpPath,'r')
while(valid):
Count=0
while (Count<20):
s=f.readline()
if (len(s)!=0):
print (s[:len(s)-1])
Count = Count + 1
if (Count==20):
Input=raw_input('press \"Enter\" for more...')
else:
Count=100
valid=False
f.close()
except IOError:
print ("Can't find help file.")
def getTEMP(addr,channel,scale=None):
global tempScale
VerifyADDR(addr)
assert ((channel>=1) and (channel<=12)),"Channel value out of range. Must be a value between 1 and 12"
if scale is None:
scal=tempScale
else:
scal=scale.lower()
assert ((scal=='c') or (scal=='f') or (scal=='k')), "Temperature scale must be 'c', 'f', or 'k'."
channel-=1;
Tvals=[[0],[0]]
resp=ppCMD(addr,0x70,channel,0,4) #initiate measurement
Tvals[0]=resp[0]*256+resp[1] #T channel data
Tvals[1]=resp[2]*256+resp[3] #Cold junction value
if channel>7:
Temp=Tvals[0]
if (Temp>0x8000):
Temp = Temp^0xFFFF
Temp = -(Temp+1)
Temp = Temp/16.0
if (scal=='k'):
Temp = Temp + 273.15
if (scal=='f'):
Temp = Temp*1.8+32.0
else:
CJtemp=Tvals[1]*2400.0/65535.0 #convert cold junction reading to voltage
CJtemp=(10.888-math.sqrt((10.888**2.0)+4*0.00347*(1777.3-CJtemp)))/(2*(-0.00347))+30.0 #convert cold junction voltage to temperature
Vcj=0
if (tType[addr][channel]=='k'):
for i in range(10):
Vcj+=kTcj[i]*(CJtemp**i) #Convert cold junction temperature to Type K voltage
#print Vcj
#Convert thermocouple A2D measurement to voltage and apply calibration values
Vmeas=((Tvals[0]*2.4/65535.0)-calOffset[addr][channel])/calScale[addr][channel]*1000 # convert thermocouple A/D value to a voltage (in millivolts)
Vhot=Vmeas+Vcj-calBias[addr]*1000.0 #Add cold junction voltage and subtract Vbias from measured voltage
k=1
if (Vhot<0):
k=0
if (Vhot>20.644):
k=2
Temp=0
for i in range(10): #convert adjusted measured thermocouple voltage to temperature
Temp+=kTc[k][i]*(Vhot**i)
else:
for i in range(9):
Vcj+=jTcj[i]*(CJtemp**i) #Convert cold junction temperature to Type J voltage
#Convert thermocouple A2D measurement to voltage and apply calibration values
Vmeas=((Tvals[0]*2.4/65535.0)-calOffset[addr][channel])/calScale[addr][channel]*1000 # convert thermocouple A/D value to a voltage (in millivolts)
Vhot=Vmeas+Vcj-calBias[addr]*1000.0 #Add cold junction voltage and subtract Vbias from measured voltage
#print Vhot, Vmeas, Vcj, calBias[addr]
k=1
if (Vhot<0):
k=0
if (Vhot>42.919):
k=2
Temp=0
for i in range(9): #convert adjusted measured thermocouple voltage to temperature
Temp+=jTc[k][i]*(Vhot**i)
#print k, jTc[k][i], Temp
if scal!='c':
if scal=='f':
Temp=Temp*1.8+32.0
else:
Temp+=273.15
Temp=round(Temp,3)
return Temp
def getCOLD(addr,scale=None):
global tempScale
VerifyADDR(addr)
if scale is None:
scal=tempScale
else:
scal=scale.lower()
assert ((scal=='c') or (scal=='f') or (scal=='k')), "Temperature scale must be 'c', 'f', or 'k'."
channel=0;
Tvals=[[0],[0]]
resp=ppCMD(addr,0x70,channel,0,4) #initiate measurement
Tvals[1]=resp[2]*256+resp[3] #Cold junction value - discard thermocouple measurement
CJtemp=Tvals[1]*2400.0/65535.0 #convert cold junction reading to voltage
CJtemp=(10.888-math.sqrt((10.888**2.0)+4*0.00347*(1777.3-CJtemp)))/(2*(-0.00347))+30.0 #convert cold junction voltage to temperature
if scal!='c':
if scal=='f':
CJtemp=CJtemp*1.8+32.0
else:
CJtemp+=273.15
CJtemp=round(CJtemp,3)
return CJtemp
def getRAW(addr,channel):
global tType
VerifyADDR(addr)
assert ((channel>=1) and (channel<=8)),"Channel value out of range. Must be a value between 1 and 8"
channel-=1
Tvals=[[0],[0]]
resp=ppCMD(addr,0x70,channel,0,4) #initiate measurement
Tvals[0]=resp[0]*256+resp[1] #T channel data
Tvals[1]=resp[2]*256+resp[3] #Cold junction value
Vmeas=((Tvals[0]*2.4/65535.0)-calOffset[addr][channel])/calScale[addr][channel]*1000 # convert thermocouple A/D value to a voltage (in millivolts)
Vraw=Vmeas-calBias[addr]*1000.0 #subtract Vbias from measured voltage
#print Tvals[0]*2.4/65535.0, Vmeas, calBias[addr]*1000.0
return Vraw
def setSCALE(scale):
global tempScale
scal=scale.lower()
assert ((scal=='c') or (scal=='f') or (scal=='k')), "Temperature scale must be 'c', 'f', or 'k'."
tempScale=scal
def getSCALE():
global tempScale
return tempScale
def setTYPE(addr,chan,type):
VerifyADDR(addr)
assert ((chan>=1) and (chan<=8)),"Thermocouple channel value out of range. Must be a value between 1 and 8"
type=type.lower()
assert ((type=='k') or (type=='j')), "Thermocouple type must be 'k' or 'j'"
tType[addr][chan-1]=type
def getTYPE(addr,chan):
VerifyADDR(addr)
assert ((chan>=1) and (chan<=8)),"Thermocouple channel value out of range. Must be a value between 1 and 8"
return tType[addr][chan-1]
def setLINEFREQ(addr,freq):
VerifyADDR(addr)
assert ((freq==50) or (freq==60)),"Frequency value out of range. Must be a either 50 or 60"
resp=ppCMD(addr,0x73,freq,0,0)
def setSMOOTH(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x74,1,0,0)
def clrSMOOTH(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x74,0,0,0)
#===============================================================================#
# Interrupt Functions #
#===============================================================================#
def setINTchannel(addr, channel): # enable interrupt at end of temperature measurement
VerifyADDR(addr)
assert ((channel>=1) and (channel<=12)),"Channel value out of range. Must be a value between 1 and 12"
channel-=1;
resp=ppCMD(addr,0x71,channel,0,0)
def intEnable(addr): #THERMOplate will pull down on INT pin if an enabled event occurs
VerifyADDR(addr)
resp=ppCMD(addr,0x04,0,0,0)
def intDisable(addr): #THERMOplate will not assert interrupts
VerifyADDR(addr)
resp=ppCMD(addr,0x05,0,0,0)
def getINTflags(addr): #read INT flag register in THERMOplate - this clears interrupt line and the register
VerifyADDR(addr)
resp=ppCMD(addr,0x06,0,0,1)
return resp[0]
#===============================================================================#
# LED Functions #
#===============================================================================#
def setLED(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x60,0,0,0)
def clrLED(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x61,0,0,0)
def toggleLED(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x62,0,0,0)
def getLED(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x63,0,0,1)
return resp[0]
#==============================================================================#
# System Functions #
#==============================================================================#
def getFWrev(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x03,0,0,1)
rev = resp[0]
whole=float(rev>>4)
point = float(rev&0x0F)
return whole+point/10.0
def getHWrev(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x02,0,0,1)
rev = resp[0]
whole=float(rev>>4)
point = float(rev&0x0F)
return whole+point/10.0
def getVersion():
return THERMOversion
def setINT(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0xF4,0,0,0)
def clrINT(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0xF5,0,0,0)
def getID(addr):
global THERMObaseADDR
VerifyADDR(addr)
addr=addr+THERMObaseADDR
id=""
arg = list(range(4))
resp = []
arg[0]=addr;
arg[1]=0x1;
arg[2]=0;
arg[3]=0;
DataGood=True
t0=time.time()
wait=True
while(wait):
if (GPIO.input(ppACK)==1):
wait=False
if ((time.time()-t0)>0.05): #timeout
wait=False
DataGood=False
if (DataGood==True):
ppFRAME = 25
GPIO.output(ppFRAME,True)
null=spi.xfer(arg,500000,50)
#DataGood=True
t0=time.time()
wait=True
while(wait):
if (GPIO.input(ppACK)!=1):
wait=False
if ((time.time()-t0)>0.05): #timeout
wait=False
DataGood=False
if (DataGood==True):
count=0
csum=0
go=True
while (go):
dummy=spi.xfer([00],500000,40)
if (dummy[0] != 0):
num = dummy[0]
csum += num
id = id + chr(num)
count += 1
else:
dummy=spi.xfer([00],500000,40)
checkSum=dummy[0]
go=False
if (count>25):
go=False
DataGood=False
if ((~checkSum & 0xFF) != (csum & 0xFF)):
DataGood=False
GPIO.output(ppFRAME,False)
return id
#==============================================================================#
# Flash Memory Functions - used for calibration constants #
#==============================================================================#
def CalGetByte(addr,ptr):
VerifyADDR(addr)
assert ((ptr>=0) and (ptr<=255)),"Calibration pointer is out of range. Must be in the range of 0 to 255"
resp=ppCMD(addr,0xFD,2,ptr,1)
return resp[0]
def CalPutByte(addr,data):
VerifyADDR(addr)
assert ((data>=0) and (data<=255)),"Calibration value is out of range. Must be in the range of 0 to 255"
resp=ppCMD(addr,0xFD,1,data,0)
def CalEraseBlock(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0xFD,0,0,0)
#==============================================================================#
# LOW Level Functions #
#==============================================================================#
def VerifyADDR(addr):
assert ((addr>=0) and (addr<MAXADDR)),"THERMOplate address out of range"
addr_str=str(addr)
assert (THERMOsPresent[addr]==1),"No THERMOplate found at address "+addr_str
def ppCMD(addr,cmd,param1,param2,bytes2return):
global THERMObaseADDR
global DataGood
DataGood=True
arg = list(range(4))
resp = []
arg[0]=addr+THERMObaseADDR;
arg[1]=cmd;
arg[2]=param1;
arg[3]=param2;
DataGood=True
t0=time.time()
wait=True
while(wait):
if (GPIO.input(ppACK)==1):
wait=False
if ((time.time()-t0)>0.05): #timeout
wait=False
DataGood=False
if (DataGood==True):
ppFRAME = 25
GPIO.output(ppFRAME,True)
null=spi.xfer(arg,500000,5)
#DataGood=True
t0=time.time()
wait=True
while(wait):
if (GPIO.input(ppACK)!=1):
wait=False
if ((time.time()-t0)>0.05): #timeout
wait=False
DataGood=False
if (bytes2return>0) and DataGood:
t0=time.time()
wait=True
while(wait):
if (GPIO.input(ppACK)!=1):
wait=False
if ((time.time()-t0)>0.08): #timeout
wait=False
DataGood=False
if (DataGood==True):
for i in range(0,bytes2return+1):
dummy=spi.xfer([00],500000,5)
resp.append(dummy[0])
csum=0;
for i in range(0,bytes2return):
csum+=resp[i]
if ((~resp[bytes2return]& 0xFF) != (csum & 0xFF)):
DataGood=False
GPIO.output(ppFRAME,False)
return resp
def verifyTC(addr,channel):
VerifyADDR(addr)
assert ((channel>=0) and (channel<=7)),"Channel value out of range. Must be a value between 1 and 13"
scal=scale.lower()
Tvals=[[0],[0]]
resp=ppCMD(addr,0x70,channel,0,4) #initiate measurement
Tvals[0]=resp[0]*256+resp[1] #T channel data
Tvals[1]=resp[2]*256+resp[3] #Cold junction value
#Convert thermocouple measurement to voltage and apply calibration
Vmeas=((calScale[addr][channel]*Tvals[0]*2.4/65535.0)/37.5-(0.01*calOffset[addr][channel]))*1000 # convert thermocouple A/D value to a voltage (in millivolts)
return Vmeas
def getADDR(addr):
global THERMObaseADDR
resp=ppCMD(addr,0x00,0,0,1)
if (DataGood):
return resp[0]-THERMObaseADDR
else:
return 8
def quietPoll():
global THERMOsPresent
ppFoundCount=0
for i in range (0,8):
THERMOsPresent[i]=0
rtn = getADDR(i)
if (rtn==i):
THERMOsPresent[i]=1
ppFoundCount += 1
getCalVals(i)
#RESET(i)
#Function to convert from binary 32bit number to floating point
def Binary2Cal(valList):
polarity=1
expsign=1
val=valList[0]
for i in range(3):
val = val << 8
val += valList[i+1]
if (val & (2**31)) != 0:
polarity = -1
exp=((val>>24)&0x7F)-64
if (exp<0):
expsign=-1
val=val&((2**24)-1)
frac=float(val)/float(((2**24)-1))*expsign
CalVal=math.pow(10,exp+frac)*polarity
return CalVal
# Function to pull calibration data from flash memory
# data consists of 17 signed 32 bit floating point numbers stored as:
# |sign|7 bit exponent (-64 to 63)|24 bit mantissa normalized to (2^24-1)|
# Data is saved as Bias Voltage, offset0, slope0, offset1, slope1 ...offset7, slope7
def getCalVals(addr):
global calScale
global calOffset
global calBias
values=list(range(4))
for j in range(4):
values[j]=CalGetByte(addr,j) #get bias voltage
calBias[addr]=Binary2Cal(values)
for i in range(8):
for j in range(4):
values[j]=CalGetByte(addr,8*i+j+4)
calOffset[addr][i]=Binary2Cal(values)
for j in range(4,8):
values[j-4]=CalGetByte(addr,8*i+j+4)
calScale[addr][i]=Binary2Cal(values)
def RESET(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x0F,0,0,0)
time.sleep(.10)
quietPoll()