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Pioneer600_code/OLED/python/SSD1306.py

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+import spidev 
+import RPi.GPIO as GPIO
+import time
+
+# Constants
+SSD1306_SETCONTRAST = 0x81
+SSD1306_DISPLAYALLON_RESUME = 0xA4
+SSD1306_DISPLAYALLON = 0xA5
+SSD1306_NORMALDISPLAY = 0xA6
+SSD1306_INVERTDISPLAY = 0xA7
+SSD1306_DISPLAYOFF = 0xAE
+SSD1306_DISPLAYON = 0xAF
+SSD1306_SETDISPLAYOFFSET = 0xD3
+SSD1306_SETCOMPINS = 0xDA
+SSD1306_SETVCOMDETECT = 0xDB
+SSD1306_SETDISPLAYCLOCKDIV = 0xD5
+SSD1306_SETPRECHARGE = 0xD9
+SSD1306_SETMULTIPLEX = 0xA8
+SSD1306_SETLOWCOLUMN = 0x00
+SSD1306_SETHIGHCOLUMN = 0x10
+SSD1306_SETSTARTLINE = 0x40
+SSD1306_MEMORYMODE = 0x20
+SSD1306_COLUMNADDR = 0x21
+SSD1306_PAGEADDR = 0x22
+SSD1306_COMSCANINC = 0xC0
+SSD1306_COMSCANDEC = 0xC8
+SSD1306_SEGREMAP = 0xA0
+SSD1306_CHARGEPUMP = 0x8D
+SSD1306_EXTERNALVCC = 0x1
+SSD1306_SWITCHCAPVCC = 0x2
+
+# Scrolling constants
+SSD1306_ACTIVATE_SCROLL = 0x2F
+SSD1306_DEACTIVATE_SCROLL = 0x2E
+SSD1306_SET_VERTICAL_SCROLL_AREA = 0xA3
+SSD1306_RIGHT_HORIZONTAL_SCROLL = 0x26
+SSD1306_LEFT_HORIZONTAL_SCROLL = 0x27
+SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL = 0x29
+SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL = 0x2A
+
+class SSD1306(object):
+	"""class for SSD1306  128*64 0.96inch OLED displays."""
+	
+	def __init__(self,rst,dc,spi):
+		self.width = 128
+		self.height = 64
+		self._pages = 8
+		self._buffer = [0]*(self.width*self._pages)
+		#Initialize DC RST pin
+		self._dc = dc
+		self._rst = rst
+		GPIO.setmode(GPIO.BCM)
+		GPIO.setwarnings(False)
+		GPIO.setup(self._dc,GPIO.OUT)
+		GPIO.setup(self._rst,GPIO.OUT)
+		#Initialize SPI
+		self._spi = spi
+	def command(self,cmd):
+		"""Send command byte to display"""
+		GPIO.output(self._dc,GPIO.LOW)
+		self._spi.writebytes([cmd])
+	def data(self,val):
+		"""Send byte of data to display"""
+		GPIO.output(self._dc,GPIO.HIGHT)
+		self._spi.writebytes([val])
+	def begin(self,vccstate=SSD1306_SWITCHCAPVCC):
+		"""Initialize dispaly"""
+		self._vccstate = vccstate
+		self.reset()
+		self.command(SSD1306_DISPLAYOFF)                    # 0xAE
+		self.command(SSD1306_SETDISPLAYCLOCKDIV)            # 0xD5
+		self.command(0x80)                     # the suggested ra    tio 0x80
+		
+		self.command(SSD1306_SETMULTIPLEX)                  # 0xA8
+		self.command(0x3F)
+		self.command(SSD1306_SETDISPLAYOFFSET)              # 0xD3
+		self.command(0x0)                                   # no offset
+		self.command(SSD1306_SETSTARTLINE | 0x0)            # line #0
+		self.command(SSD1306_CHARGEPUMP)                    # 0x8D
+		if self._vccstate == SSD1306_EXTERNALVCC:
+			self.command(0x10)
+		else:
+			self.command(0x14)
+		self.command(SSD1306_MEMORYMODE)                    # 0x20
+		self.command(0x00)                            # 0x0 act like ks0108        
+		self.command(SSD1306_SEGREMAP | 0x1)
+		self.command(SSD1306_COMSCANDEC)
+		self.command(SSD1306_SETCOMPINS)                    # 0xDA
+		self.command(0x12)
+		self.command(SSD1306_SETCONTRAST)                   # 0x81
+		if self._vccstate == SSD1306_EXTERNALVCC:
+			self.command(0x9F)
+		else:
+			self.command(0xCF)
+		self.command(SSD1306_SETPRECHARGE)                  # 0xd9
+		if self._vccstate == SSD1306_EXTERNALVCC:
+			self.command(0x22)
+		else:
+			self.command(0xF1)
+		self.command(SSD1306_SETVCOMDETECT)                 # 0xDB
+		self.command(0x40)
+		self.command(SSD1306_DISPLAYALLON_RESUME)           # 0xA4
+		self.command(SSD1306_NORMALDISPLAY)                 # 0xA6
+		self.command(SSD1306_DISPLAYON)
+	def reset(self):
+		"""Reset the display"""
+		GPIO.output(self._rst,GPIO.HIGH)
+		time.sleep(0.001)
+		GPIO.output(self._rst,GPIO.LOW)
+		time.sleep(0.010)
+		GPIO.output(self._rst,GPIO.HIGH)
+	def display(self):
+		"""Write display buffer to physical display"""
+		self.command(SSD1306_COLUMNADDR)
+		self.command(0)                  #Cloumn start address
+		self.command(self.width-1)     #Cloumn end address
+		self.command(SSD1306_PAGEADDR)
+		self.command(0)					 #Page start address
+		self.command(self._pages-1)		 #Page end address
+		#Write buffer data
+		GPIO.output(self._dc,GPIO.HIGH)
+		self._spi.writebytes(self._buffer)
+	def image(self, image):
+		"""Set buffer to value of Python Imaging Library image."""
+		if image.mode != '1':
+			raise ValueError('Image must be in mode 1.')
+		imwidth, imheight = image.size
+		if imwidth != self.width or imheight != self.height:
+			raise ValueError('Image must be same dimensions as display \
+				({0}x{1}).' .format(self.width, self.height))
+
+		pix = image.load()
+		# Iterate through the memory pages
+		index = 0
+		for page in range(self._pages):
+			# Iterate through all x axis columns.
+			for x in range(self.width):
+			# Set the bits for the column of pixels at the current position.
+				bits = 0
+				# Don't use range here as it's a bit slow
+				for bit in [0, 1, 2, 3, 4, 5, 6, 7]:
+					bits = bits << 1
+					bits |= 0 if pix[(x, page*8+7-bit)] == 0 else 1
+				# Update buffer byte and increment to next byte.
+				self._buffer[index] = bits
+				index += 1
+	def clear(self):
+		"""Clear contents of image buffer"""
+		self._buffer = [0]*(self.width*self._pages)
+	def set_contrast(self, contrast):
+		"""Sets the contrast of the display.
+		Contrast should be a value between 0 and 255."""
+		if contrast < 0 or contrast > 255:
+			raise ValueError('Contrast must be a value from 0 to 255).')
+		self.command(SSD1306_SETCONTRAST)
+		self.command(contrast)
+
+	def dim(self, dim):
+		"""Adjusts contrast to dim the display if dim is True, 
+		otherwise sets the contrast to normal brightness if dim is False."""
+        # Assume dim display.
+		contrast = 0
+        # Adjust contrast based on VCC if not dimming.
+		if not dim:
+			if self._vccstate == SSD1306_EXTERNALVCC:
+				contrast = 0x9F
+			else:
+				contrast = 0xCF
+
+
+
+