import spidev
import time
spi=spidev.SpiDev()
spi.open(0,0)
spi.max_speed_hz = 50000
spi.mode=3
spi.bits_per_word = 8
x = [ ]
for i in range(256):
  x.append(i)

try:
resp = spi.xfer(x)
time.sleep(0.01)

except KeyboardInterrupt:
  print 'SPI Closed'
  spi.close()