Python Adafruit_GPIO.Platform类代码示例

	def test_revision_1(self):
		with patch('__builtin__.open') as mock_open:
			handle = mock_open.return_value.__enter__.return_value
			handle.__iter__.return_value = iter(['Revision : 0002'])
			rev = Platform.pi_revision()
			self.assertEquals(rev, 1)
		with patch('__builtin__.open') as mock_open:
			handle = mock_open.return_value.__enter__.return_value
			handle.__iter__.return_value = iter(['Revision : 0003'])
			rev = Platform.pi_revision()
			self.assertEquals(rev, 1)

def get_platform_pwm(**keywords):
    """Attempt to return a PWM instance for the platform which the code is being
    executed on.  Currently supports only the Raspberry Pi using the RPi.GPIO
    library and Beaglebone Black using the Adafruit_BBIO library.  Will throw an
    exception if a PWM instance can't be created for the current platform.  The
    returned PWM object has the same interface as the RPi_PWM_Adapter and
    BBIO_PWM_Adapter classes.
    """
    plat = Platform.platform_detect()
    if plat == Platform.RASPBERRY_PI:
        import RPi.GPIO
        return RPi_PWM_Adapter(RPi.GPIO, **keywords)
    elif plat == Platform.BEAGLEBONE_BLACK:
        import Adafruit_BBIO.PWM
        return BBIO_PWM_Adapter(Adafruit_BBIO.PWM, **keywords)
    elif plat == Platform.CHIP:
        if "pwmtype" in keywords.keys():
            if keywords["pwmtype"] == "pwm":
                import CHIP_IO.PWM
                return CHIP_PWM_Adapter(CHIP_IO.PWM)
            elif keywords["pwmtype"] == "softpwm":
                import CHIP_IO.SOFTPWM
                return CHIP_PWM_Adapter(CHIP_IO.SOFTPWM)
        else:
            raise ValueError('For CHIP, you need to specify pwmtype in argument with value pwm or softpwm: get_platform_pwm(pwmtype="pwm") or get_platform_type(pwmtype="softpwm")')
    elif plat == Platform.UNKNOWN:
        raise RuntimeError('Could not determine platform.')

	def __init__(self, dc, spi, rst=None, gpio=None, width=ILI9341_TFTWIDTH,
		height=ILI9341_TFTHEIGHT):
		"""Create an instance of the display using SPI communication.  Must
		provide the GPIO pin number for the D/C pin and the SPI driver.  Can
		optionally provide the GPIO pin number for the reset pin as the rst
		parameter.
		"""
		self._dc = dc
		self._rst = rst
		self._spi = spi
		self._gpio = gpio
		self.width = width
		self.height = height
		if self._gpio is None:
			self._gpio = GPIO.get_platform_gpio()
		# Set DC as output.
		self._gpio.setup(dc, GPIO.OUT)
		# Setup reset as output (if provided).
		if rst is not None:
			self._gpio.setup(rst, GPIO.OUT)
		# Set SPI to mode 0, MSB first.
		spi.set_mode(0)
		spi.set_bit_order(SPI.MSBFIRST)
	
                # Clock nerfed for the Minnowboard	
                if(Platform.platform_detect() == 3):
                    spi.set_clock_hz(1000000)
                else:
                    spi.set_clock_hz(64000000)
		
                # Create an image buffer.
		self.buffer = Image.new('RGB', (width, height))

def get_platform_gpio(**keywords):
    """Attempt to return a GPIO instance for the platform which the code is being
    executed on.  Currently supports only the Raspberry Pi using the RPi.GPIO
    library and Beaglebone Black using the Adafruit_BBIO library.  Will throw an
    exception if a GPIO instance can't be created for the current platform.  The
    returned GPIO object is an instance of BaseGPIO.
    """

    print "GPIO.py get_platform_gpio()"




    plat = Platform.platform_detect()
    if plat == Platform.RASPBERRY_PI:
        import RPi.GPIO
        return RPiGPIOAdapter(RPi.GPIO, **keywords)
    #elif plat == Platform.BEAGLEBONE_BLACK:
        #import Adafruit_BBIO.GPIO
        #return AdafruitBBIOAdapter(Adafruit_BBIO.GPIO, **keywords)
    #elif plat == Platform.MINNOWBOARD:
        #import mraa
        #return AdafruitMinnowAdapter(mraa, **keywords)
    elif plat == Platform.UNKNOWN:
        raise RuntimeError('Could not determine platform.')

def get_default_bus():
    """Return the default bus number based on the device platform.  For a
    Raspberry Pi either bus 0 or 1 (based on the Pi revision) will be returned.
    For a Beaglebone Black the first user accessible bus, 1, will be returned.
    """
    plat = Platform.platform_detect()
    if plat == Platform.RASPBERRY_PI:
        if Platform.pi_revision() == 1:
            # Revision 1 Pi uses I2C bus 0.
            return 0
        else:
            # Revision 2 Pi uses I2C bus 1.
            return 1
    elif plat == Platform.BEAGLEBONE_BLACK:
        # Beaglebone Black has multiple I2C buses, default to 1 (P9_19 and P9_20).
        return 1
    else:
        raise RuntimeError('Could not determine default I2C bus for platform.')

def get_default_bus():
    """Return the default bus number based on the device platform.  For a
    Raspberry Pi either bus 0 or 1 (based on the Pi revision) will be returned.
    For a Beaglebone Black the first user accessible bus, 1, will be returned.
    """
    plat = Platform.platform_detect()
    if plat == Platform.RASPBERRY_PI:
        if Platform.pi_revision() == 1:
            # Revision 1 Pi uses I2C bus 0.
            return 0
        else:
            # Revision 2 Pi uses I2C bus 1.
            return 1
    elif plat == Platform.BEAGLEBONE_BLACK:
        # Beaglebone Black has multiple I2C buses, default to 1 (P9_19 and P9_20).
        return 1
    elif plat == Platform.CHIP:
        # CHIP has 2 user accessible I2C busses, default to 2 (U1425 and U14_26)
        # The 4.4 Kernel CHIPs remove i2c-1 for the ability to set with a dtb overlay
        # and therefore isn't accessible without one
        return 2
    else:
        raise RuntimeError("Could not determine default I2C bus for platform.")

def require_repeated_start():
    """Enable repeated start conditions for I2C register reads.  This is the
    normal behavior for I2C, however on some platforms like the Raspberry Pi
    there are bugs which disable repeated starts unless explicitly enabled with
    this function.  See this thread for more details:
      http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=15840
    """
    plat = Platform.platform_detect()
    if plat == Platform.RASPBERRY_PI:
        # On the Raspberry Pi there is a bug where register reads don't send a
        # repeated start condition like the kernel smbus I2C driver functions
        # define.  As a workaround this bit in the BCM2708 driver sysfs tree can
        # be changed to enable I2C repeated starts.
        subprocess.check_call('chmod 666 /sys/module/i2c_bcm2708/parameters/combined', shell=True)
        subprocess.check_call('echo -n 1 > /sys/module/i2c_bcm2708/parameters/combined', shell=True)

def get_platform_pwm(**keywords):
    """Attempt to return a PWM instance for the platform which the code is being
    executed on.  Currently supports only the Raspberry Pi using the RPi.GPIO
    library and Beaglebone Black using the Adafruit_BBIO library.  Will throw an
    exception if a PWM instance can't be created for the current platform.  The
    returned PWM object has the same interface as the RPi_PWM_Adapter and
    BBIO_PWM_Adapter classes.
    """
    plat = Platform.platform_detect()
    if plat == Platform.RASPBERRY_PI:
        import RPi.GPIO
        return RPi_PWM_Adapter(RPi.GPIO, **keywords)
    elif plat == Platform.BEAGLEBONE_BLACK:
        import Adafruit_BBIO.PWM
        return BBIO_PWM_Adapter(Adafruit_BBIO.PWM, **keywords)
    elif plat == Platform.UNKNOWN:
        raise RuntimeError('Could not determine platform.')

def get_platform_gpio(**keywords):
	"""Attempt to return a GPIO instance for the platform which the code is being
	executed on.  Currently supports only the Raspberry Pi using the RPi.GPIO
	library and Beaglebone Black using the Adafruit_BBIO library.  Will throw an
	exception if a GPIO instance can't be created for the current platform.  The
	returned GPIO object is an instance of BaseGPIO.
	"""
	plat = Platform.platform_detect()
	if plat == Platform.RASPBERRY_PI:
		try:
			from sysfs.gpio import GPIOController
			return LinuxSysFSAdapter(GPIOController(), **keywords)
		except:
			import RPi.GPIO
			return RPiGPIOAdapter(RPi.GPIO, **keywords)
		
	elif plat == Platform.BEAGLEBONE_BLACK:
		import Adafruit_BBIO.GPIO
		return AdafruitBBIOAdapter(Adafruit_BBIO.GPIO, **keywords)
	elif plat == Platform.UNKNOWN:
		raise RuntimeError('Could not determine platform.')

 def test_unknown(self):
     result = Platform.platform_detect()
     self.assertEquals(result, Platform.UNKNOWN)

 def test_beaglebone_black(self):
     result = Platform.platform_detect()
     self.assertEquals(result, Platform.BEAGLEBONE_BLACK)

	def test_raspberry_pi(self):
		result = Platform.platform_detect()
		self.assertEquals(result, Platform.RASPBERRY_PI)

 def test_revision_2(self):
     with patch("__builtin__.open") as mock_open:
         handle = mock_open.return_value.__enter__.return_value
         handle.__iter__.return_value = iter(["Revision : 000e"])
         rev = Platform.pi_revision()
         self.assertEquals(rev, 2)