def send_data(data):
	# Send bit7-4 firstly
	buf = data & 0xF0
	buf |= 0x05               # RS = 1, RW = 0, EN = 1
	write_word(LCD_ADDR ,buf)
	time.sleep(0.002)
	buf &= 0xFB               # Make EN = 0
	write_word(LCD_ADDR ,buf)

	# Send bit3-0 secondly
	buf = (data & 0x0F) << 4
	buf |= 0x05               # RS = 1, RW = 0, EN = 1
	write_word(LCD_ADDR ,buf)
	time.sleep(0.002)
	buf &= 0xFB               # Make EN = 0
	write_word(LCD_ADDR ,buf)