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