# The MIT License (MIT)
#
# Copyright (c) 2017 Dan Halbert
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# THE SOFTWARE.
#
"""
`adafruit_max7219.bcddigits.BCDDigits`
====================================================
"""
from adafruit_max7219 import max7219
from micropython import const
__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 object 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, cs, nDigits=1):
self._ndigits = nDigits
super().__init__(self._ndigits, 8, spi, cs)
def init_display(self):
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, value):
"""
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, values):
"""
Display digits from a list.
:param int s: digit to start display zero-based
:param list ds: 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, bit_value=None):
"""
The decimal point for a digit.
:param int dpos: the digit to set the decimal point zero-based
:param int value: value > zero lights the decimal point, else unlights the point
"""
if dpos < self._ndigits and dpos >= 0:
#print('set dot {} = {}'.format((self._ndigits - d -1),col))
self.pixel(self._ndigits-dpos-1, 7, bit_value)
[docs] def clear_all(self):
"""
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, strg):
"""
Displays a numeric str in the display. Shows digits ``0-9``, ``-``, and ``.``.
:param int start: start position to show the numeric string
:param string str: the numeric string
"""
cpos = start
for char in strg:
# print('c {}'.format(c))
value = 0x0f # assume blank
if char >= '0' and 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):
"""
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)