213 lines
7.8 KiB
Python
213 lines
7.8 KiB
Python
# Copyright (c) 2014 Adafruit Industries
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# Author: Tony DiCola
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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from . import HT16K33
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# Digit value to bitmask mapping:
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DIGIT_VALUES = {
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' ': 0b0000000000000000,
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'!': 0b0000000000000110,
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'"': 0b0000001000100000,
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'#': 0b0001001011001110,
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'$': 0b0001001011101101,
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'%': 0b0000110000100100,
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'&': 0b0010001101011101,
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'\'': 0b0000010000000000,
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'(': 0b0010010000000000,
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')': 0b0000100100000000,
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'*': 0b0011111111000000,
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'+': 0b0001001011000000,
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',': 0b0000100000000000,
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'-': 0b0000000011000000,
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'.': 0b0000000000000000,
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'/': 0b0000110000000000,
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'0': 0b0000110000111111,
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'1': 0b0000000000000110,
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'2': 0b0000000011011011,
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'3': 0b0000000010001111,
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'4': 0b0000000011100110,
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'5': 0b0010000001101001,
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'6': 0b0000000011111101,
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'7': 0b0000000000000111,
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'8': 0b0000000011111111,
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'9': 0b0000000011101111,
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':': 0b0001001000000000,
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';': 0b0000101000000000,
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'<': 0b0010010000000000,
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'=': 0b0000000011001000,
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'>': 0b0000100100000000,
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'?': 0b0001000010000011,
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'@': 0b0000001010111011,
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'A': 0b0000000011110111,
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'B': 0b0001001010001111,
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'C': 0b0000000000111001,
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'D': 0b0001001000001111,
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'E': 0b0000000011111001,
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'F': 0b0000000001110001,
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'G': 0b0000000010111101,
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'H': 0b0000000011110110,
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'I': 0b0001001000000000,
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'J': 0b0000000000011110,
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'K': 0b0010010001110000,
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'L': 0b0000000000111000,
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'M': 0b0000010100110110,
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'N': 0b0010000100110110,
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'O': 0b0000000000111111,
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'P': 0b0000000011110011,
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'Q': 0b0010000000111111,
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'R': 0b0010000011110011,
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'S': 0b0000000011101101,
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'T': 0b0001001000000001,
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'U': 0b0000000000111110,
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'V': 0b0000110000110000,
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'W': 0b0010100000110110,
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'X': 0b0010110100000000,
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'Y': 0b0001010100000000,
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'Z': 0b0000110000001001,
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'[': 0b0000000000111001,
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'\\': 0b0010000100000000,
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']': 0b0000000000001111,
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'^': 0b0000110000000011,
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'_': 0b0000000000001000,
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'`': 0b0000000100000000,
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'a': 0b0001000001011000,
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'b': 0b0010000001111000,
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'c': 0b0000000011011000,
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'd': 0b0000100010001110,
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'e': 0b0000100001011000,
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'f': 0b0000000001110001,
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'g': 0b0000010010001110,
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'h': 0b0001000001110000,
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'i': 0b0001000000000000,
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'j': 0b0000000000001110,
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'k': 0b0011011000000000,
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'l': 0b0000000000110000,
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'm': 0b0001000011010100,
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'n': 0b0001000001010000,
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'o': 0b0000000011011100,
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'p': 0b0000000101110000,
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'q': 0b0000010010000110,
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'r': 0b0000000001010000,
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's': 0b0010000010001000,
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't': 0b0000000001111000,
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'u': 0b0000000000011100,
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'v': 0b0010000000000100,
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'w': 0b0010100000010100,
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'x': 0b0010100011000000,
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'y': 0b0010000000001100,
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'z': 0b0000100001001000,
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'{': 0b0000100101001001,
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'|': 0b0001001000000000,
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'}': 0b0010010010001001,
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'~': 0b0000010100100000
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}
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class AlphaNum4(HT16K33.HT16K33):
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"""Alphanumeric 14 segment LED backpack display."""
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def __init__(self, **kwargs):
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"""Initialize display. All arguments will be passed to the HT16K33 class
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initializer, including optional I2C address and bus number parameters.
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"""
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super(AlphaNum4, self).__init__(**kwargs)
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def set_digit_raw(self, pos, bitmask):
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"""Set digit at position to raw bitmask value. Position should be a value
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of 0 to 3 with 0 being the left most digit on the display."""
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if pos < 0 or pos > 3:
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# Ignore out of bounds digits.
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return
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# Set the digit bitmask value at the appropriate position.
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# Also set bit 7 (decimal point) if decimal is True.
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self.buffer[pos*2] = bitmask & 0xFF
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self.buffer[pos*2+1] = (bitmask >> 8) & 0xFF
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def set_decimal(self, pos, decimal):
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"""Turn decimal point on or off at provided position. Position should be
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a value 0 to 3 with 0 being the left most digit on the display. Decimal
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should be True to turn on the decimal point and False to turn it off.
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"""
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if pos < 0 or pos > 3:
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# Ignore out of bounds digits.
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return
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# Set bit 14 (decimal point) based on provided value.
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if decimal:
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self.buffer[pos*2+1] |= (1 << 6)
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else:
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self.buffer[pos*2+1] &= ~(1 << 6)
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def set_digit(self, pos, digit, decimal=False):
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"""Set digit at position to provided value. Position should be a value
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of 0 to 3 with 0 being the left most digit on the display. Digit should
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be any ASCII value 32-127 (printable ASCII).
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"""
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self.set_digit_raw(pos, DIGIT_VALUES.get(str(digit), 0x00))
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if decimal:
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self.set_decimal(pos, True)
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def print_str(self, value, justify_right=True):
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"""Print a 4 character long string of values to the display. Characters
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in the string should be any ASCII value 32 to 127 (printable ASCII).
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"""
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# Calculcate starting position of digits based on justification.
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pos = (4-len(value)) if justify_right else 0
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# Go through each character and print it on the display.
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for i, ch in enumerate(value):
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self.set_digit(i+pos, ch)
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def print_number_str(self, value, justify_right=True):
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"""Print a 4 character long string of numeric values to the display. This
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function is similar to print_str but will interpret periods not as
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characters but as decimal points associated with the previous character.
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"""
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# Calculate length of value without decimals.
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length = len(value.translate(None, '.'))
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# Error if value without decimals is longer than 4 characters.
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if length > 4:
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self.print_str('----')
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return
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# Calculcate starting position of digits based on justification.
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pos = (4-length) if justify_right else 0
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# Go through each character and print it on the display.
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for i, ch in enumerate(value):
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if ch == '.':
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# Print decimal points on the previous digit.
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self.set_decimal(pos-1, True)
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else:
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self.set_digit(pos, ch)
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pos += 1
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def print_float(self, value, decimal_digits=2, justify_right=True):
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"""Print a numeric value to the display. If value is negative
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it will be printed with a leading minus sign. Decimal digits is the
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desired number of digits after the decimal point.
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"""
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format_string = '{{0:0.{0}F}}'.format(decimal_digits)
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self.print_number_str(format_string.format(value), justify_right)
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def print_hex(self, value, justify_right=True):
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"""Print a numeric value in hexadecimal. Value should be from 0 to FFFF.
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"""
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if value < 0 or value > 0xFFFF:
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# Ignore out of range values.
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return
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self.print_str('{0:X}'.format(value), justify_right)
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