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- #!/usr/bin/python
- import time
- import datetime
- from Adafruit_LEDBackpack import LEDBackpack
- # ===========================================================================
- # 7-Segment Display
- # ===========================================================================
- # This class is meant to be used with the four-character, seven segment
- # displays available from Adafruit
- class SevenSegment:
- disp = None
-
- # Hexadecimal character lookup table (row 1 = 0..9, row 2 = A..F)
- digits = [ 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, \
- 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71 ]
- # Constructor
- def __init__(self, address=0x70, debug=False):
- if (debug):
- print "Initializing a new instance of LEDBackpack at 0x%02X" % address
- self.disp = LEDBackpack(address=address, debug=debug)
- def writeDigitRaw(self, charNumber, value):
- "Sets a digit using the raw 16-bit value"
- if (charNumber > 7):
- return
- # Set the appropriate digit
- self.disp.setBufferRow(charNumber, value)
- def writeDigit(self, charNumber, value, dot=False):
- "Sets a single decimal or hexademical value (0..9 and A..F)"
- if (charNumber > 7):
- return
- if (value > 0xF):
- return
- # Set the appropriate digit
- self.disp.setBufferRow(charNumber, self.digits[value] | (dot << 7))
- def setColon(self, state=True):
- "Enables or disables the colon character"
- # Warning: This function assumes that the colon is character '2',
- # which is the case on 4 char displays, but may need to be modified
- # if another display type is used
- if (state):
- self.disp.setBufferRow(2, 0xFFFF)
- else:
- self.disp.setBufferRow(2, 0)
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