import smbus
import time
#bus = smbus.SMBus(0)  # Rev 1 Pi uses 0
bus = smbus.SMBus(1) # Rev 2 Pi uses 1

DEVICE = 0x12
char=''
out=''
print bus.write_byte(DEVICE,15)
print 'start'
while True:
    rd=bus.read_byte(DEVICE)
    if rd==0:
        print out
        out=''
        bus.write_byte(DEVICE,15)
    else:
        out = out+chr(rd)
    time.sleep(0.05)