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Jan
256
tm1637.py
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256
tm1637.py
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import math
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import RPi.GPIO as IO
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import threading
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from time import sleep, localtime
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# from tqdm import tqdm
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# IO.setwarnings(False)
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IO.setmode(IO.BCM)
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HexDigits = [0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d,
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0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71, 0x49, 0x50 ]
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# 0 1 2 3 4 5 6
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# 7 8 9 A B C D E F = r
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#
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# 0
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# ---
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# | |
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# 5 | 7 | 1
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# ---
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# | |
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# 4 | | 2
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# ---
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# 3
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#
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ADDR_AUTO = 0x40
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ADDR_FIXED = 0x44
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STARTADDR = 0xC0
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# DEBUG = False
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class TM1637:
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__doublePoint = False
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__Clkpin = 0
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__Datapin = 0
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__brightness = 1.0 # default to max brightness
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__currentData = [0, 0, 0, 0]
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def __init__(self, CLK, DIO, brightness):
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self.__Clkpin = CLK
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self.__Datapin = DIO
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self.__brightness = brightness
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IO.setup(self.__Clkpin, IO.OUT)
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IO.setup(self.__Datapin, IO.OUT)
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def cleanup(self):
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"""Stop updating clock, turn off display, and cleanup GPIO"""
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self.StopClock()
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self.Clear()
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IO.cleanup()
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def Clear(self):
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b = self.__brightness
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point = self.__doublePoint
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self.__brightness = 0
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self.__doublePoint = False
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data = [0x7F, 0x7F, 0x7F, 0x7F]
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self.Show(data)
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# Restore previous settings:
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self.__brightness = b
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self.__doublePoint = point
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def ShowInt(self, i):
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s = str(i)
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self.Clear()
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for i in range(0, len(s)):
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self.Show1(i, int(s[i]))
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def Show(self, data):
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for i in range(0, 4):
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self.__currentData[i] = data[i]
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self.start()
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self.writeByte(ADDR_AUTO)
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self.br()
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self.writeByte(STARTADDR)
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for i in range(0, 4):
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self.writeByte(self.coding(data[i]))
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self.br()
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self.writeByte(0x88 + int(self.__brightness))
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self.stop()
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def Show1(self, DigitNumber, data):
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"""show one Digit (number 0...3)"""
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if(DigitNumber < 0 or DigitNumber > 3):
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return # error
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self.__currentData[DigitNumber] = data
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self.start()
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self.writeByte(ADDR_FIXED)
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self.br()
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self.writeByte(STARTADDR | DigitNumber)
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self.writeByte(self.coding(data))
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self.br()
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self.writeByte(0x88 + int(self.__brightness))
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self.stop()
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def SetBrightness(self, percent):
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"""Accepts percent brightness from 0 - 1"""
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max_brightness = 7.0
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brightness = math.ceil(max_brightness * percent)
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if (brightness < 0):
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brightness = 0
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if(self.__brightness != brightness):
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self.__brightness = brightness
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self.Show(self.__currentData)
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def SetBrightnessRaw(self, brightness):
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"""Accepts raw brightness from 0 - 7"""
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if(self.__brightness != brightness):
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self.__brightness = brightness
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self.Show(self.__currentData)
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def ShowDoublepoint(self, on):
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"""Show or hide double point divider"""
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if(self.__doublePoint != on):
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self.__doublePoint = on
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self.Show(self.__currentData)
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def writeByte(self, data):
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for i in range(0, 8):
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IO.output(self.__Clkpin, IO.LOW)
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if(data & 0x01):
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IO.output(self.__Datapin, IO.HIGH)
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else:
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IO.output(self.__Datapin, IO.LOW)
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data = data >> 1
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IO.output(self.__Clkpin, IO.HIGH)
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# wait for ACK
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IO.output(self.__Clkpin, IO.LOW)
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IO.output(self.__Datapin, IO.HIGH)
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IO.output(self.__Clkpin, IO.HIGH)
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IO.setup(self.__Datapin, IO.IN)
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while(IO.input(self.__Datapin)):
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sleep(0.001)
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if(IO.input(self.__Datapin)):
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IO.setup(self.__Datapin, IO.OUT)
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IO.output(self.__Datapin, IO.LOW)
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IO.setup(self.__Datapin, IO.IN)
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IO.setup(self.__Datapin, IO.OUT)
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def start(self):
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"""send start signal to TM1637"""
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IO.output(self.__Clkpin, IO.HIGH)
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IO.output(self.__Datapin, IO.HIGH)
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IO.output(self.__Datapin, IO.LOW)
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IO.output(self.__Clkpin, IO.LOW)
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def stop(self):
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IO.output(self.__Clkpin, IO.LOW)
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IO.output(self.__Datapin, IO.LOW)
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IO.output(self.__Clkpin, IO.HIGH)
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IO.output(self.__Datapin, IO.HIGH)
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def br(self):
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"""terse break"""
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self.stop()
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self.start()
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def coding(self, data):
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if(self.__doublePoint):
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pointData = 0x80
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else:
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pointData = 0
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if(data == 0x7F):
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data = 0
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else:
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data = HexDigits[data] + pointData
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return data
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def clock(self, military_time):
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"""Clock script modified from:
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https://github.com/johnlr/raspberrypi-tm1637"""
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self.ShowDoublepoint(True)
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while (not self.__stop_event.is_set()):
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t = localtime()
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hour = t.tm_hour
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if not military_time:
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hour = 12 if (t.tm_hour % 12) == 0 else t.tm_hour % 12
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d0 = hour // 10 if hour // 10 else 0
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d1 = hour % 10
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d2 = t.tm_min // 10
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d3 = t.tm_min % 10
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digits = [d0, d1, d2, d3]
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self.Show(digits)
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# # Optional visual feedback of running alarm:
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# print digits
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# for i in tqdm(range(60 - t.tm_sec)):
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for i in range(60 - t.tm_sec):
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if (not self.__stop_event.is_set()):
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sleep(1)
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def StartClock(self, military_time=True):
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# Stop event based on: http://stackoverflow.com/a/6524542/3219667
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self.__stop_event = threading.Event()
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self.__clock_thread = threading.Thread(
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target=self.clock, args=(military_time,))
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self.__clock_thread.start()
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def StopClock(self):
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try:
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print 'Attempting to stop live clock'
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self.__stop_event.set()
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except:
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print 'No clock to close'
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if __name__ == "__main__":
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"""Confirm the display operation"""
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display = TM1637(CLK=26, DIO=16, brightness=1.0)
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display.Clear()
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digits = [1, 2, 3, 4]
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display.Show(digits)
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print "1234 - Working? (Press Key)"
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scrap = raw_input()
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print "Updating one digit at a time:"
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display.Clear()
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display.Show1(1, 3)
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sleep(0.5)
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display.Show1(2, 2)
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sleep(0.5)
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display.Show1(3, 1)
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sleep(0.5)
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display.Show1(0, 4)
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print "4321 - (Press Key)"
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scrap = raw_input()
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print "Add double point\n"
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display.ShowDoublepoint(True)
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sleep(0.2)
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print "Brightness Off"
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display.SetBrightness(0)
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sleep(0.5)
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print "Full Brightness"
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display.SetBrightness(1)
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sleep(0.5)
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print "30% Brightness"
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display.SetBrightness(0.3)
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sleep(0.3)
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display.ShowDoublepoint(False)
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display.Show1(0,0x7f);
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display.Show1(1,14);
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display.Show1(2,17);
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display.Show1(3,17);
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# See clock.py for how to use the clock functions!
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