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DAQCplate.py
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DAQCplate.py
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import spidev
import time
import string
import site
import sys
import RPi.GPIO as GPIO
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)
GPIObaseADDR=8
ppFRAME = 25
ppINT = 22
GPIO.setup(ppFRAME,GPIO.OUT)
GPIO.output(ppFRAME,False) #Initialize FRAME signal
GPIO.setup(ppINT, GPIO.IN, pull_up_down=GPIO.PUD_UP) #reserve interrupt input
spi = spidev.SpiDev()
spi.open(0,1)
localPath=site.getsitepackages()[0]
helpPath=localPath+'/piplates/DAQChelp.txt'
DAQCversion=1.03
daqcsPresent = range(8)
Vcc=range(8)
MAXADDR=8
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.")
#===============================================================================#
# ADC Functions #
#===============================================================================#
def getADC(addr,channel):
VerifyADDR(addr)
VerifyAINchannel(channel)
resp=ppCMD(addr,0x30,channel,0,2)
value=(256*resp[0]+resp[1])
value=round(value*4.096/1024,3)
if (channel==8):
value=value*2.0
return value
def getADCall(addr):
value=range(8)
VerifyADDR(addr)
resp=ppCMD(addr,0x31,0,0,16)
for i in range (0,8):
value[i]=(256*resp[2*i]+resp[2*i+1])
value[i]=round(value[i]*4.096/1024,3)
return value
#===============================================================================#
# Digital Input Functions #
#===============================================================================#
def getDINbit(addr,bit):
VerifyADDR(addr)
VerifyDINchannel(bit)
resp=ppCMD(addr,0x20,bit,0,1)
if resp[0] > 0:
return 1
else:
return 0
def getDINall(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x25,0,0,1)
return resp[0]
def enableDINint(addr, bit, edge): # enable DIN interrupt
VerifyADDR(addr)
VerifyDINchannel(bit)
if ((edge=='f') or (edge=='F')):
resp=ppCMD(addr,0x21,bit,0,0)
if ((edge=='r') or (edge=='R')):
resp=ppCMD(addr,0x22,bit,0,0)
if ((edge=='b') or (edge=='B')):
resp=ppCMD(addr,0x23,bit,0,0)
def disableDINint(addr,bit): # disable DIN interrupt
VerifyADDR(addr)
VerifyDINchannel(bit)
resp=ppCMD(addr,0x24,bit,0,0)
def getTEMP(addr,channel,scale):
VerifyADDR(addr)
assert ((channel>=0) and (channel<=7)),"Channel value out of range. Must be a value between 0 and 7"
scal=scale.lower()
assert ((scal=='c') or (scal=='f') or (scal=='k')), "Temperature scale must be 'c', 'f', or 'k'."
resp=ppCMD(addr,0x70,channel,0,0) #initiate measurement
time.sleep(1)
resp=ppCMD(addr,0x71,channel,0,2) #get data
Temp=resp[0]*256+resp[1]
if (Temp>0x8000):
Temp = Temp^0xFFFF
Temp = -(Temp+1)
Temp = round((Temp/16.0),4)
if (scal=='k'):
Temp = Temp + 273
if (scal=='f'):
Temp = round((Temp*1.8+32.2),4)
return Temp
#===============================================================================#
# Hybrid Functions #
#=========================================================================#
def getRANGE(addr, channel, units):
VerifyADDR(addr)
assert ((channel>=0) and (channel<=6)),"Channel value out of range. Must be a value between 0 and 6"
uni=units.lower()
assert ((uni=='c') or (uni=='i')), "ERROR: incorrect units parameter. Must be 'c' or 'i'."
resp = ppCMD(addr,0x80,channel,0,0) # initiate measurement
time.sleep(.07)
resp = ppCMD(addr,0x81,channel,0,2) # get data
Range = resp[0]*256+resp[1]
#assert (Range!=0), "ERROR: sensor failure?"
if (uni == 'c'):
Range = Range/58.326
if (uni == 'i'):
Range = Range/148.148
Range = round(Range, 3)
return Range
#===============================================================================#
# LED Functions #
#===============================================================================#
def setLED(addr,led):
VerifyADDR(addr)
VerifyLED(led)
resp=ppCMD(addr,0x60,led,0,0)
def clrLED(addr,led):
VerifyADDR(addr)
VerifyLED(led)
resp=ppCMD(addr,0x61,led,0,0)
def toggleLED(addr,led):
VerifyADDR(addr)
VerifyLED(led)
resp=ppCMD(addr,0x62,led,0,0)
def getLED(addr,led):
VerifyADDR(addr)
VerifyLED(led)
resp=ppCMD(addr,0x63,led,0,1)
return resp[0]
def VerifyLED(led):
assert (led>=0 and led<=1),"Invalid LED value. Must be 0 or 1"
#==============================================================================#
# Switch Functions #
#==============================================================================#
def getSWstate(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x50,0,0,1)
return resp[0]
def enableSWint(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x51,0,0,0)
def disableSWint(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x52,0,0,0)
def enableSWpower(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x53,0,0,0)
def disableSWpower(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x54,0,0,0)
#==============================================================================#
# Digital Output Functions #
#==============================================================================#
def setDOUTbit(addr,bit):
VerifyADDR(addr)
VerifyDOUTchannel(bit)
resp=ppCMD(addr,0x10,bit,0,0)
def clrDOUTbit(addr,bit):
VerifyADDR(addr)
VerifyDOUTchannel(bit)
resp=ppCMD(addr,0x11,bit,0,0)
def toggleDOUTbit(addr,bit):
VerifyADDR(addr)
VerifyDOUTchannel(bit)
resp=ppCMD(addr,0x12,bit,0,0)
def setDOUTall(addr,byte):
VerifyADDR(addr)
assert ((byte>=0) and (byte<=127)),"Digital output value out of range. Must be in the range of 0 to 127"
resp=ppCMD(addr,0x13,byte,0,0)
def getDOUTbyte(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x14,0,0,1)
return resp
#==============================================================================#
# PWM and DAC Output Functions #
#==============================================================================#
def setPWM(addr,channel,value):
VerifyADDR(addr)
assert (value<=1023 and value>=0), "ERROR: PWM argument out of range - must be between 0 and 1023"
assert (channel==0 or channel==1), "Error: PWM channel must be 0 or 1"
hibyte = value>>8
lobyte = value - (hibyte<<8)
resp=ppCMD(addr,0x40+channel,hibyte,lobyte,0)
def getPWM(addr,channel):
VerifyADDR(addr)
assert (channel==0 or channel==1), "Error: PWM channel must be 0 or 1"
## Return PWM set value
resp=ppCMD(addr,0x40+channel+2,0,0,2)
value=(256*resp[0]+resp[1])
return value
def setDAC(addr,channel,value):
global Vcc
VerifyADDR(addr)
assert (value>=0 and value<=4.095), "ERROR: PWM argument out of range - must be between 0 and 4.095 volts"
assert (channel==0 or channel==1), "Error: DAC channel must be 0 or 1"
value = int(value/Vcc[addr]*1024)
hibyte = value>>8
lobyte = value - (hibyte<<8)
resp=ppCMD(addr,0x40+channel,hibyte,lobyte,0)
def getDAC(addr,channel):
global Vcc
VerifyADDR(addr)
assert (channel==0 or channel==1), "Error: DAC channel must be 0 or 1"
## Return DAC value
resp=ppCMD(addr,0x40+channel+2,0,0,2)
value=(256*resp[0]+resp[1])
value=value*Vcc[addr]/1023
return value
def calDAC(addr):
global Vcc
VerifyADDR(addr)
Vcc[addr] = getADC(addr,8)
#==============================================================================#
# Interrupt Control Functions #
#==============================================================================#
def intEnable(addr): #DAQC will pull down on INT pin if an enabled event occurs
VerifyADDR(addr)
resp=ppCMD(addr,0x04,0,0,0)
def intDisable(addr):
VerifyADDR(addr)
resp=ppCMD(addr,0x05,0,0,0)
def getINTflags(addr): #read INT flag registers in DAQC
VerifyADDR(addr)
resp=ppCMD(addr,0x06,0,0,2)
value=(256*resp[0]+resp[1])
return value
#==============================================================================#
# 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 DAQCversion
def getADDR(addr):
assert ((addr>=0) and (addr<MAXADDR)),"DAQCplate address must be in the range of 0 to 7"
resp=ppCMD(addr,0x00,0,0,1)
return resp[0]
def getID(addr):
global GPIObaseADDR
VerifyADDR(addr)
addr=addr+GPIObaseADDR
id=""
arg = range(4)
resp = []
arg[0]=addr;
arg[1]=0x1;
arg[2]=0;
arg[3]=0;
ppFRAME = 25
GPIO.output(ppFRAME,True)
null = spi.writebytes(arg)
count=0
time.sleep(.0001)
while (count<20):
dummy=spi.xfer([00],500000,40)
time.sleep(.0001)
if (dummy[0] != 0):
num = dummy[0]
id = id + chr(num)
count = count + 1
else:
count=20
GPIO.output(ppFRAME,False)
return id
def getPROGdata(addr,paddr): #read a byte of data from program memory
VerifyADDR(addr)
resp=ppCMD(addr,0xF0,paddr>>8,paddr&0xFF,2)
value=(256*resp[0]+resp[1])
return hex(value)
def Poll():
ppFoundCount=0
for i in range (0,8):
rtn = getADDR(i)
if ((rtn-8)==i):
print "DAQCplate found at address",rtn-8
ppFoundCount += 1
if (ppFoundCount == 0):
print "No DAQCplates found"
def VerifyDINchannel(din):
assert ((din>=0) and (din<=7)),"Digital input channel value out of range. Must be in the range of 0 to 7"
def VerifyAINchannel(ain):
assert ((ain>=0) and (ain<=8)),"Analog input channel value out of range. Must be in the range of 0 to 8"
def VerifyDOUTchannel(dout):
assert ((dout>=0) and (dout<=6)),"Digital output channel value out of range. Must be in the range of 0 to 6"
def VerifyADDR(addr):
assert ((addr>=0) and (addr<MAXADDR)),"DAQCplate address must be in the range of 0 to 7"
addr_str=str(addr)
assert (daqcsPresent[addr]==1),"No DAQCplate found at address "+addr_str
def ppCMD(addr,cmd,param1,param2,bytes2return):
global GPIObaseADDR
arg = range(4)
resp = []
arg[0]=addr+GPIObaseADDR;
arg[1]=cmd;
arg[2]=param1;
arg[3]=param2;
# time.sleep(.0005)
GPIO.output(ppFRAME,True)
null=spi.xfer(arg,300000,60)
#null = spi.writebytes(arg)
if bytes2return>0:
time.sleep(.0001)
for i in range(0,bytes2return):
dummy=spi.xfer([00],500000,20)
resp.append(dummy[0])
GPIO.output(ppFRAME,False)
time.sleep(.0003)
return resp
def Init():
global daqcsPresent
for i in range (0,8):
daqcsPresent[i]=0
Vcc[i]=10000
rtn = getADDR(i)
if ((rtn-8)==i):
daqcsPresent[i]=1
ok=0
while(ok==0):
Vcc[i] = getADC(i,8)
if Vcc[i]>3.0:
ok=1
setDOUTall(i,0)
setPWM(i,0,0)
setPWM(i,1,0)
Init()