# SPDX-FileCopyrightText: 2017 Dan Halbert for Adafruit Industries
#
# SPDX-License-Identifier: MIT
"""
`adafruit_max7219.bcddigits.BCDDigits`
====================================================
"""
from micropython import const
from adafruit_max7219 import max7219
try:
# Used only for typing
from typing import List
import digitalio
import busio
except ImportError:
pass
__version__ = "0.0.0+auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_MAX7219.git"
_DECODEMODE = const(9)
_SCANLIMIT = const(11)
_SHUTDOWN = const(12)
_DISPLAYTEST = const(15)
[docs]
class BCDDigits(max7219.MAX7219):
"""
Basic support for display on a 7-Segment BCD display controlled
by a Max7219 chip using SPI.
:param ~busio.SPI spi: an spi busio or spi bitbangio object
:param ~digitalio.DigitalInOut cs: digital in/out to use as chip select signal
:param int nDigits: number of led 7-segment digits; default 1; max 8
"""
def __init__(self, spi: busio.SPI, cs: digitalio.DigitalInOut, nDigits: int = 1):
self._ndigits = nDigits
super().__init__(self._ndigits, 8, spi, cs)
[docs]
def init_display(self) -> None:
for cmd, data in (
(_SHUTDOWN, 0),
(_DISPLAYTEST, 0),
(_SCANLIMIT, 7),
(_DECODEMODE, (2**self._ndigits) - 1),
(_SHUTDOWN, 1),
):
self.write_cmd(cmd, data)
self.clear_all()
self.show()
[docs]
def set_digit(self, dpos: int, value: int) -> None:
"""
Display one digit.
:param int dpos: the digit position; zero-based
:param int value: integer ranging from 0->15
"""
dpos = self._ndigits - dpos - 1
for i in range(4):
# print('digit {} pixel {} value {}'.format(dpos,i+4,v & 0x01))
self.pixel(dpos, i, value & 0x01)
value >>= 1
[docs]
def set_digits(self, start: int, values: List[int]) -> None:
"""
Display digits from a list.
:param int start: digit to start display zero-based
:param list[int] values: list of integer values ranging from 0->15
"""
for value in values:
# print('set digit {} start {}'.format(d,start))
self.set_digit(start, value)
start += 1
[docs]
def show_dot(self, dpos: int, bit_value: int = None) -> None:
"""
The decimal point for a digit.
:param int dpos: the digit to set the decimal point zero-based
:param int bit_value: value > zero lights the decimal point, else unlights the point
"""
if 0 <= dpos < self._ndigits:
# print('set dot {} = {}'.format((self._ndigits - d -1),col))
self.pixel(self._ndigits - dpos - 1, 7, bit_value)
[docs]
def clear_all(self) -> None:
"""
Clear all digits and decimal points.
"""
self.fill(1)
for i in range(self._ndigits):
self.show_dot(i)
[docs]
def show_str(self, start: int, strg: str) -> None:
"""
Displays a numeric str in the display. Shows digits ``0-9``, ``-``, and ``.``.
:param int start: start position to show the numeric string
:param str strg: the numeric string
"""
cpos = start
for char in strg:
# print('c {}'.format(c))
value = 0x0F # assume blank
if "0" <= char <= "9":
value = int(char)
elif char == "-":
value = 10 # minus sign
elif char == ".":
self.show_dot(cpos - 1, 1)
continue
self.set_digit(cpos, value)
cpos += 1
[docs]
def show_help(self, start: int) -> None:
"""
Display the word HELP in the display.
:param int start: start position to show HELP
"""
digits = [12, 11, 13, 14]
self.set_digits(start, digits)