#!/usr/bin/env python
 # -*- coding: euc-jp -*- 
 import sys
 import time
 import spidev
 
 class ADC:
   def __init__(self):
     self.spi = spidev.SpiDev()
     self.spi.open(0, 0)
 
   def get_value(self, channel):
     sned_ch = [0x00,0x08,0x10,0x18]
     if ((channel > 3) or (channel < 0)):
       return -1
     r = self.spi.xfer2([sned_ch[channel],0,0,0])
     ret = ((r[2] << 6 ) & 0x300) |  ((r[2] << 6) & 0xc0) | ((r[3] >> 2) & 0x3f)
     return ret     
 
   def get_voltage(self, channel):
     ret = self.get_value(channel) * 5.0 / 1024
     return ret     
 
 def main():
   adc = ADC()
   while 1:
     adc1 = adc.get_value(0)
     msg1 = "%1.5fV(%04x)" % ((float(adc1)*5/1024),adc1)
     print msg1,
 
     adc1 = adc.get_value(1)
     msg1 = "%1.5fV(%04x)" % ((float(adc1)*5/1024),adc1)
     print msg1,
 
     adc2 = adc.get_value(2)
     msg2 = "%1.5fV(%04x)" % ((float(adc2)*5/1024),adc2)
     print msg2,
 
     adc3 = adc.get_value(3)
     msg3 = "%1.5fV(%04x)" % ((float(adc3)*5/1024),adc3)
     print msg3,
 
     sys.stdout.write("\n")
     time.sleep(0.5)
 
 if __name__ == '__main__':
   main()

 #!/usr/bin/env python
 # -*- coding: euc-jp -*- 
 import spidev
 from time import sleep
 
 spi = spidev.SpiDev()
 spi.open(0,1)
 
 def changeLevel(ch,  onOff, percent):
   bit7 = ch    << 7
   bit6 = 0     << 6
   bit5 = 1     << 5
   bit4 = onOff << 4
   size=12
   number=(2**size-1)*percent/100
   number= number<<(12-size)
   number= number<<(12-size)
   bottomPart= number % 256
   topPart=(number-bottomPart)>>8
   firstByte=bit7+bit6+bit5+bit4+topPart
   secondByte=bottomPart
   return spi.xfer2([firstByte,secondByte])
 
 
 def which_channel():
   channel = raw_input("Which channel do you want to test? Type 0 or 1.\n")
   while not channel.isdigit():
       channel = raw_input("Try again - just numbers 0 or 1 please!\n")
   return channel
 
 
 def main():
   channel = 3
   while not (channel == 1 or channel == 0):
       channel = int(which_channel())
   
   print "These are the connections for the digital to analogue test:"
   print "jumper connecting GP11 to SCLK"
   print "jumper connecting GP10 to MOSI"
   print "jumper connecting GP9 to MISO"
   print "jumper connecting GP7 to CSnB"
   print "Multimeter connections (set your meter to read V DC):"
   print "  connect black probe to GND"
   print "  connect red probe to DA%d on J29" % channel
   
   raw_input("When ready hit enter.\n")
   percent=[0,25,75,100]
   
   for p in percent:
       r = changeLevel(channel,1,p)
       print "Your meter should read about {0:.2f}V".format(p*2.048/100.0)
       raw_input("When ready hit enter.\n")
 
   r = changeLevel(0,0,0)
   r = changeLevel(1,0,0)
 
 if __name__ == '__main__':
   main()
 

 #!/usr/bin/env python
 # -*- coding: euc-jp -*- 
 import smbus
 import time
 
 def main():
   # LCD initialize
   i2c = smbus.SMBus(1)
   addr = 0x3e
   contrast = 42   # 0-63
   i2c.write_byte_data(addr, 0, 0x38)  # function set(IS=0)
   i2c.write_byte_data(addr, 0, 0x39)  # function set(IS=1)
   i2c.write_byte_data(addr, 0, 0x14)  # internal osc
   i2c.write_byte_data(addr, 0,(0x70 | (contrast & 0x0f))) # contrast
   i2c.write_byte_data(addr, 0,(0x54 | ((contrast >> 4) & 0x03)))  # contrast/icon/power
   i2c.write_byte_data(addr, 0, 0x6c)  # follower control
   time.sleep(0.2)
   i2c.write_byte_data(addr, 0, 0x38)  # function set(IS=0)
   i2c.write_byte_data(addr, 0, 0x0C)  # Display On
   i2c.write_byte_data(addr, 0, 0x01)  # Clear Display
   i2c.write_byte_data(addr, 0, 0x06)  # Entry Mode Set
   time.sleep(0.2)
 
   # LCD Clear
   i2c.write_byte_data(addr, 0, 0x38)  # function set(IS=0)
   i2c.write_byte_data(addr, 0, 0x0C)  # Display On
   i2c.write_byte_data(addr, 0, 0x01)  # Clear Display
   i2c.write_byte_data(addr, 0, 0x06)  # Entry Mode Set
   time.sleep(0.2)
 
   # Send to LCD
   line1 = '__test__'
   for c in line1:
     i2c.write_byte_data(addr, 0x40, ord(c))
   i2c.write_byte_data(addr, 0, 0xc0)  # 2nd line
   line2 = '__!(^^)!__'
   for c in line2:
     i2c.write_byte_data(addr, 0x40, ord(c))
       
 
 if __name__ == '__main__':
   main()