42d7e283d2
This error may occur when busnum is incorrect: "IOError: [Errno 16] Device or resource busy" Refer to this Adafruit Forum issue for more information "LED Backpack not working on beaglebone black with debian" https://forums.adafruit.com/viewtopic.php?f=49&t=140344 Signed-off-by: Drew Fustini <drew@pdp7.com>
102 lines
4 KiB
Python
102 lines
4 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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import time
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from Adafruit_LED_Backpack import SevenSegment
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# Create display instance on default I2C address (0x70) and bus number.
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display = SevenSegment.SevenSegment()
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# Alternatively, create a display with a specific I2C address and/or bus.
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# display = SevenSegment.SevenSegment(address=0x74, busnum=1)
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# On BeagleBone, try busnum=2 if IOError occurs with busnum=1
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# display = SevenSegment.SevenSegment(address=0x74, busnum=2)
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# Initialize the display. Must be called once before using the display.
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display.begin()
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# Keep track of the colon being turned on or off.
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colon = False
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# Run through different number printing examples.
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print('Press Ctrl-C to quit.')
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numbers = [0.0, 1.0, -1.0, 0.55, -0.55, 10.23, -10.2, 100.5, -100.5]
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while True:
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# Print floating point values with default 2 digit precision.
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for i in numbers:
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# Clear the display buffer.
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display.clear()
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# Print a floating point number to the display.
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display.print_float(i)
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# Set the colon on or off (True/False).
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display.set_colon(colon)
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# Write the display buffer to the hardware. This must be called to
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# update the actual display LEDs.
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display.write_display()
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# Delay for a second.
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time.sleep(1.0)
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# Print the same numbers with 1 digit precision.
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for i in numbers:
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display.clear()
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display.print_float(i, decimal_digits=1)
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display.set_colon(colon)
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display.write_display()
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time.sleep(1.0)
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# Print the same numbers with no decimal digits and left justified.
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for i in numbers:
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display.clear()
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display.print_float(i, decimal_digits=0, justify_right=False)
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display.set_colon(colon)
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display.write_display()
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time.sleep(1.0)
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# Run through some hex digits.
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for i in range(0xFF):
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display.clear()
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display.print_hex(i)
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display.set_colon(colon)
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display.write_display()
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time.sleep(0.25)
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# Run through hex digits with an inverted (flipped upside down)
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# display.
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display.set_invert(True)
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for i in range(0xFF):
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display.clear()
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display.print_hex(i)
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display.set_colon(colon)
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display.write_display()
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time.sleep(0.25)
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display.set_invert(False)
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# For the large 1.2" 7-segment display only there are extra functions to
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# turn on/off the left side colon and the fixed decimal point. Uncomment
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# to try them out:
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# To turn on the left side colon:
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#display.set_left_colon(True)
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# To turn off the left side colon:
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#display.set_left_colon(False)
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# To turn on the fixed decimal point (in upper right in normal orientation):
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#display.set_fixed_decimal(True)
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# To turn off the fixed decimal point:
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#display.set_fixed_decimal(False)
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# Make sure to call write_display() to make the above visible!
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# Flip colon on or off.
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colon = not colon
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