new_contents: #!/usr/bin/python
  import RPi.GPIO as GPIO
  import time
  import datetime
  import os
  from time import strftime
  
  CS=4
  CS2=7
  CLK=11
  MOSI=10
  MISO=9
  LDAC=8
  
  GPIO.setwarnings(False)
  GPIO.setmode(GPIO.BCM)
  GPIO.setup(CS,GPIO.OUT)
  GPIO.setup(CLK,GPIO.OUT)
  GPIO.setup(MOSI,GPIO.OUT)
  GPIO.setup(CS2,GPIO.OUT)
  GPIO.setup(LDAC,GPIO.OUT)
  GPIO.setup(MISO,GPIO.IN,pull_up_down=GPIO.PUD_UP)
  GPIO.output(CS,True)
  GPIO.output(CLK,False)
  GPIO.output(MOSI,True)
  
  
  def myspi(rdata):
    dataX=0
    mask=0x80
    for i in range(8):
      if(rdata & mask):
        GPIO.output(MOSI,True)
      else:
        GPIO.output(MOSI,False)
      GPIO.output(CLK,True)
      if(GPIO.input(MISO)==1):
        dataX=dataX+mask
      GPIO.output(CLK,False)
      mask=mask>>1
    return dataX;
  
  
  def readADC(ch):
     	cmd=0
   	if ch==0: cmd=0x80 	 	
   	elif ch==1: cmd=0xc0	
  	#elif ch==2: cmd=0x00
  	#elif ch==4: cmd=0x04
  	GPIO.output(CS,False)
  	a=myspi(0x01)
  	#print "a: ",a
  	b=myspi(cmd)
  	#print "b: ",b
  	c=myspi(0x00)
  	#print "c: ",c 
  	v= ((b&0x0f)<<8)+ c
  	#print "v: ",v
  	GPIO.output(CS,True)
  	v=round(float(v),2)
  	#v=round(float(v)/4095*3.3,2)
          return v;
  
  def setDAC(data, channel):
       cmd=0
       if channel == 1: cmd=0xF0
       else: cmd=0x70
  
       GPIO.output(LDAC,False)
       GPIO.output(CS2,False)
       data=int(float(data*4095/255))
       a=myspi((data>>8)+ cmd)
       b=myspi(data&0xFF)
       GPIO.output(CS2,True)
  
       return;
  
  
  
  
subject: Create MCP3202.py