gistfile1.rb

require 'wiringpi'

DATA_PIN = 3
CLOCK_PIN = 2
LATCH_PIN = 0

NUM_OFF  = 1
NUM_ON = 0
SEG_OFF = 0
SEG_ON = 1

#LSBFIRST = 0
#MSBFIRST = 1

  message = `uptime` + ' ---- ' # 'this is not the prettiest font in the world - '

charOffset = 0

startTime = Time.now

WIO = WiringPi::GPIO.new(0)
WIO.mode DATA_PIN, OUTPUT
WIO.mode CLOCK_PIN, OUTPUT
WIO.mode LATCH_PIN, OUTPUT

@charMap = Hash[
	'a' => [SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_ON],
	'b' => [SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON],
	'c' => [SEG_ON,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_OFF],
	'd' => [SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_ON],
	'e' => [SEG_ON,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON],
	'f' => [SEG_ON,SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON],
	'g' => [SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_OFF],
	'h' => [SEG_OFF,SEG_OFF,SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_ON],
	'i' => [SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF],
	'j' => [SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF],
	'k' => [SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_ON],
	'l' => [SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_OFF],
	'm' => [SEG_ON,SEG_OFF,SEG_ON,SEG_OFF,SEG_ON,SEG_OFF,SEG_OFF],
	'n' => [SEG_OFF,SEG_OFF,SEG_ON,SEG_OFF,SEG_ON,SEG_OFF,SEG_ON],
	'o' => [SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_ON],
	'p' => [SEG_ON,SEG_ON,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON],
	'q' => [SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON],
	'r' => [SEG_ON,SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_OFF],
	's' => [SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON],
	't' => [SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON],
	'u' => [SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_OFF],
	'v' => [SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF],
	'w' => [SEG_OFF,SEG_ON,SEG_OFF,SEG_ON,SEG_OFF,SEG_ON,SEG_OFF],
	'x' => [SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_ON],
	'y' => [SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON],
	'z' => [SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_ON],
	'0' => [SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_OFF],
	'1' => [SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON,SEG_OFF],
	'2' => [SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_ON],
	'3' => [SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF,SEG_ON],
	'4' => [SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF,SEG_ON,SEG_ON],
	'5' => [SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON],
	'6' => [SEG_ON,SEG_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON],
	'7' => [SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF],
	'8' => [SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON],
	'9' => [SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_OFF,SEG_ON,SEG_ON],
	' ' => [SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF],
	'-' => [SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON],
	'_' => [SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON,SEG_OFF,SEG_OFF,SEG_OFF]
]

def shiftOut(dataPin, clockPin, latchPin, bits)
        WIO.write( latchPin, LOW )

		#firstByte = bits[0,7].reverse.join.to_i(2)
		#secondByte = bits[8,15].reverse.join.to_i(2)

		bits.each_slice(8) do |slice|
            #puts 'Shifting out ' + slice.reverse.join.to_i(2).to_s
			Wiringpi.shiftOut(dataPin, clockPin, LSBFIRST, slice.reverse.join.to_i(2)) 
		end

		#WIO.write( clockPin, LOW )
        #bits.each do |bit|
        #
        #    WIO.write( dataPin, bit )
        #    WIO.write( clockPin, HIGH )
        #    WIO.write( clockPin, LOW )
        #
        #end
        WIO.write( latchPin, HIGH )
end

def lcdd(digit,segments)

	top			= segments[0]
	topright	= segments[1]
	bottomright	= segments[2]
	bottom		= segments[3]
	bottomleft	= segments[4]
	topleft		= segments[5]
	middle		= segments[6]

	digit1 = NUM_OFF
	digit2 = NUM_OFF
	digit3 = NUM_OFF
	digit4 = NUM_OFF

	digit1 = NUM_ON if digit == 1
	digit2 = NUM_ON if digit == 2
	digit3 = NUM_ON if digit == 3
	digit4 = NUM_ON if digit == 4

	lcd(digit1,digit2,digit3,digit4,top,topright,bottomright,bottom,bottomleft,topleft,middle)

end

def lcd(digit1,digit2,digit3,digit4,top,topright,bottomright,bottom,bottomleft,topleft,middle)

shiftOut DATA_PIN, CLOCK_PIN, LATCH_PIN, [digit1,digit2,bottom,bottomleft,digit3,digit4,0,0,topright,middle,top,bottomright,topleft,0,0,0]

end

    def shiftOutArray(dataPin, clockPin, latchPin, bits)

      Wiringpi.digitalWrite( latchPin, LOW )

      bits.each_slice(8) do |slice|
        Wiringpi.shiftOut(dataPin, clockPin, LSBFIRST, slice.reverse.join.to_i(2)) 
      end

      Wiringpi.digitalWrite( latchPin, HIGH )

    end

def charToBits(char)

	if @charMap.has_key? char
		@charMap[ char ]
	else
		[SEG_OFF,SEG_OFF,SEG_OFF,SEG_ON,SEG_OFF,SEG_OFF,SEG_OFF]
	end

end


while 1

#lcd(NUM_ON,NUM_OFF,NUM_OFF,NUM_OFF,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON,SEG_ON)

if (Time.now - startTime) * 1000 >= 250

	message = `uptime` + ' ---- '

	charOffset += 1

	if charOffset > message.length
		charOffset = 1
	end

	startTime = Time.now

end


(1..4).each do |digit|

letters = message+message
letters = letters[charOffset,charOffset+4]

lcdd digit, charToBits(letters[digit-1])

#puts 'Shifting to digit ' + digit.to_s

sleep 0.001

end

end