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examples/n5510-mcp23017.py

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+# Turns on each pin of an mcp23017 on address 0x20 ( quick2wire IO expander )
+import wiringpi
+
+PIN_BACKLIGHT = 67 # LED
+PIN_SCLK = 68 # Clock SCLK
+PIN_SDIN = 69 # DN(MOSI)
+PIN_DC = 70 # D/C
+PIN_RESET = 71 # RST Reset
+PIN_SCE = 72 # SCE
+
+#PIN_BACKLIGHT = 5
+#PIN_SCLK = 4
+#PIN_SDIN = 3
+#PIN_DC = 2
+#PIN_RESET = 1
+#PIN_SCE = 0
+
+OUTPUT = 1
+INPUT = 0
+HIGH = 1
+LOW = 0
+
+LCD_C = 0
+LCD_D = 1
+
+LCD_X = 84
+LCD_Y = 48
+LCD_SEGS = 504
+
+MSBFIRST = 1
+LSBFIRST = 0
+
+SLOW_DOWN = 400
+
+pin_base = 65
+i2c_addr = 0x21
+
+wiringpi.wiringPiSetup()
+wiringpi.mcp23017Setup(pin_base,i2c_addr)
+
+def slow_shift_out(data_pin, clock_pin, data):
+  for bit in bin(data).replace('0b','').rjust(8,'0'):
+    wiringpi.digitalWrite(clock_pin,LOW)
+    wiringpi.delay(SLOW_DOWN)
+    wiringpi.digitalWrite(data_pin,int(bit))
+    wiringpi.delay(SLOW_DOWN)
+    wiringpi.digitalWrite(clock_pin,HIGH)
+    wiringpi.delay(SLOW_DOWN)
+
+def lcd_write(dc, data):
+  wiringpi.digitalWrite(PIN_DC, dc)
+  wiringpi.digitalWrite(PIN_SCE, LOW)
+  wiringpi.delay(SLOW_DOWN)
+  #wiringpi.shiftOut(PIN_SDIN, PIN_SCLK, MSBFIRST, data)
+  slow_shift_out(PIN_SDIN, PIN_SCLK, data)
+  wiringpi.digitalWrite(PIN_SCE, HIGH)
+  wiringpi.delay(SLOW_DOWN)
+  #wiringpi.delay(2)
+
+def lcd_initialise():
+  wiringpi.pinMode(PIN_BACKLIGHT,OUTPUT)
+  wiringpi.digitalWrite(PIN_BACKLIGHT, HIGH)
+  wiringpi.pinMode(PIN_SCE, OUTPUT)
+  wiringpi.pinMode(PIN_RESET, OUTPUT)
+  wiringpi.pinMode(PIN_DC, OUTPUT)
+  wiringpi.pinMode(PIN_SDIN, OUTPUT)
+  wiringpi.pinMode(PIN_SCLK, OUTPUT)
+  wiringpi.digitalWrite(PIN_RESET, LOW)
+  wiringpi.delay(SLOW_DOWN)
+  wiringpi.digitalWrite(PIN_RESET, HIGH)
+  wiringpi.delay(SLOW_DOWN)
+  lcd_write(LCD_C, 0x21 )  # LCD Extended Commands.
+  lcd_write(LCD_C, 0xCC )  # Set LCD Vop (Contrast). 
+  lcd_write(LCD_C, 0x04 )  # Set Temp coefficent. //0x04
+  lcd_write(LCD_C, 0x14 )  # LCD bias mode 1:48. //0x13
+  lcd_write(LCD_C, 0x0C )  # LCD in normal mode.
+  lcd_write(LCD_C, 0x20 )
+  lcd_write(LCD_C, 0x0C )
+
+def lcd_clear():
+  for time in range(0, LCD_SEGS):
+    lcd_write(LCD_D, 0x00)
+
+def lcd_fill():
+  for time in range(0, LCD_SEGS):
+    lcd_write(LCD_D, 0xFF)
+
+
+lcd_initialise()
+
+for time in range(0,4):
+  lcd_clear()
+  wiringpi.delay(1000)
+  lcd_fill()
+  wiringpi.delay(1000)