HT1635B driver (ported from https://github.com/alotaiba/HT1635B)

HT1635B.py

#!/usr/bin/python

import smbus
import time

bus = smbus.SMBus(1)

class HT1635B():
    DEVICE_ADDRESS    = 0x68
    CMD_RAM_W         = 0b10000000
    CMD_BLINK         = 0b10000100
    CMD_COM           = 0b10001000
    CMD_OSC           = 0b10100000
    CMD_SYSTEM_MODE   = 0b10000010
    CMD_BRIGHTNESS    = 0b11000000

    def __init__(self):
        self._row_data = bytearray(43)

    def set_row_memory(self, index, data):
        self._row_data[index] |= data

    def clear_row_memory(self, index, data):
        self._row_data[index] &= ~(data)

    def set_pixel(self, x, y):
        self.set_row_memory(x, self._get_y_byte_location(y))

    def clear_pixel(self, x, y):
        self.clear_row_memory(x, self._get_y_byte_location(y))

    def clear(self):
        self._row_data = bytearray(43)

    def render(self):
        data = list()
        data.append(0)
        data.extend(self._row_data[:30])
        bus.write_i2c_block_data(self.DEVICE_ADDRESS, self.CMD_RAM_W, data)
        data = list()
        data.append(0x3c)
        data.extend(self._row_data[30:])
        bus.write_i2c_block_data(self.DEVICE_ADDRESS, self.CMD_RAM_W, data)

    # Power-on default is highest brightness (15)
    # 0-lowest to 15-highest
    def set_brightness(self, brightness):
        bus.write_byte_data(self.DEVICE_ADDRESS, self.CMD_BRIGHTNESS, brightness)

    # Power-on default is no blink
    # 0: No blink
    # 1: 2Hz blink (2 blinks per second) fastest
    # 2: 1Hz blink (1 blink per second) normal
    # 3: 0.5Hz blink (1 second on/1 second off) slow
    def set_blinking(self, speed):
        bus.write_byte_data(self.DEVICE_ADDRESS, self.CMD_BLINK, speed)

    # Power-on default is N-MOS
    # 0: N-MOS
    # 1: P-MOS
    def set_com(self, option):
        bus.write_byte_data(self.DEVICE_ADDRESS, self.CMD_COM, option)

    # Power-on default is RC master mode 0 (4)
    # 0-3: Slave mode, use external OSC, OSC pin input, Sync pin input
    # 4 - RC master mode 0, use on chip OSC, OSC pin Hi-Z, Sync pin high
    # 5 - RC master mode 1, use on chip OSC, OSC pin output, Sync pin output
    # 6 - EXT CLK master mode 0, use external OSC, OSC pin input, Sync pin high
    # 7 - EXT CLK master mode 1, use external OSC, OSC pin input, Sync pin output
    # 
    def set_osc(self, mode):
        bus.write_byte_data(self.DEVICE_ADDRESS, self.CMD_OSC, mode)

    # Power-on default is System disabled, LED off (0-1)
    # 0-1: System disabled, LED off
    # 2 - System enabled, LED off
    # 3 - System enabled, LED on
    def set_system_mode(self, mode):
        bus.write_byte_data(self.DEVICE_ADDRESS, self.CMD_SYSTEM_MODE, mode)

    def _get_y_byte_location(self, y):
        firstBit = 0b10000000
        yBitLocationInByte = y % 8
        return (firstBit >> yBitLocationInByte)