# Display3b.py

import smbus
import time

PATTERN = {' ': 0, '!': 134, '"': 34, '#': 0, '$': 0, '%': 0, '&': 0,
'\'': 2, '(': 0, ')': 0, '*': 0, '+': 0, ',': 4, '-': 64, '.': 128,
'/': 82, '0': 63, '1': 6, '2': 91, '3': 79,'4': 102, '5': 109, '6': 125,
'7': 7, '8': 127, '9': 111, ':': 0, ';': 0, '<': 0, '=': 72, '>': 0,
'?': 0, '@': 93, 'A': 119, 'B': 124, 'C': 57, 'D': 94, 'E': 121,'F': 113,
'G': 61, 'H': 118, 'I': 48, 'J': 14, 'K': 112, 'L': 56, 'M': 85, 'N': 84,
'O': 63, 'P': 115, 'Q': 103, 'R': 80, 'S': 45, 'T': 120, 'U': 62, 'V': 54,
'W': 106, 'X': 73, 'Y': 110, 'Z': 27, '[': 57, '\\': 100, ']': 15,
'^': 35, '_': 8, '`': 32, 'a': 119, 'b': 124, 'c': 88, 'd': 94, 'e': 121,
'f': 113, 'g': 61, 'h': 116, 'i': 16, 'j': 12, 'k': 112, 'l': 48, 'm': 85,
'n': 84, 'o': 92, 'p': 115, 'q': 103, 'r': 80, 's': 45, 't': 120, 'u': 28,
'v': 54, 'w': 106, 'x': 73, 'y': 110, 'z': 27, '{': 0, '|': 48, '}': 0,
'~': 65}

i2c_address = 0x38
bus = smbus.SMBus(1)

def setup():
    instruction_byte = 0x00
    control_byte = 0b00010111 
    # b0 = 1: dynamic mode (autoincrement digits)  
    # b1 = 1: digit 1/3 not blanked, b2 = 1: digit 2/4 not blanked
    # b4 = 1: 3 mA segment current 
    # write to control register
    bus.write_byte_data(i2c_address, instruction_byte, control_byte)

def toSegment(text):
   data = []
   for c in text:
       data.append(PATTERN[c])
   return data

setup()
text = "run "
data = toSegment(text)
bus.write_i2c_block_data(i2c_address, 1, data)
time.sleep(3)
for i in range(1001):
    text = "%4d" %i # right adjusted
    data = toSegment(text)
    bus.write_i2c_block_data(i2c_address, 1, data)
    time.sleep(0.01)
time.sleep(3)
text = "donE"
data = toSegment(text)
bus.write_i2c_block_data(i2c_address, 1, data)