initial working ft232h i2c/spi/gpio

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / ft232h / pin.py

diff --git a/src/adafruit_blinka/microcontroller/ft232h/pin.py b/src/adafruit_blinka/microcontroller/ft232h/pin.py
new file mode 100644 (file)
index 0000000..d9763d2
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/ft232h/pin.py
@@ -0,0 +1,79 @@
+class Pin:
+    """A basic Pin class for use with FT232H."""
+
+    IN = 0
+    OUT = 1
+    LOW = 0
+    HIGH = 1
+
+    ft232h_gpio = None
+
+    def __init__(self, pin_id=None):
+        # setup GPIO controller if not done yet
+        # use one provided by I2C as default
+        if not Pin.ft232h_gpio:
+            from pyftdi.i2c import I2cController
+            i2c = I2cController()
+            i2c.configure("ftdi:///1")
+            Pin.ft232h_gpio = i2c.get_gpio()
+        # check if pin is valid
+        if pin_id:
+            if Pin.ft232h_gpio.all_pins & 1 << pin_id == 0:
+                raise ValueError("Can not use pin {} as GPIO.".format(pin_id))
+        # ID is just bit position
+        self.id = pin_id
+
+    def init(self, mode=IN, pull=None):
+        if not self.id:
+            raise RuntimeError("Can not init a None type pin.")
+        # FT232H does't have configurable internal pulls?
+        if pull:
+            raise ValueError("Internal pull up/down not currently supported.")
+        pin_mask = Pin.ft232h_gpio.pins | 1 << self.id
+        current = Pin.ft232h_gpio.direction
+        if mode == self.OUT:
+            current |= 1 << self.id
+        else:
+            current &= ~(1 << self.id)
+        Pin.ft232h_gpio.set_direction(pin_mask, current)
+
+    def value(self, val=None):
+        if not self.id:
+            raise RuntimeError("Can not access a None type pin.")
+        current = Pin.ft232h_gpio.read(with_output=True)
+        # read
+        if val is None:
+            return 1 if current & 1 << self.id != 0 else 0
+        # write
+        elif val in (self.LOW, self.HIGH):
+            if val == self.HIGH:
+                current |= 1 << self.id
+            else:
+                current &= ~(1 << self.id)
+            Pin.ft232h_gpio.write(current & Pin.ft232h_gpio.direction)
+        # release the kraken
+        else:
+            raise RuntimeError("Invalid value for pin")
+
+# create pin instances for each pin
+# D0 to D3 are used by I2C/SPI
+D4 = Pin(4)
+D5 = Pin(5)
+D6 = Pin(6)
+D7 = Pin(7)
+C0 = Pin(8)
+C1 = Pin(9)
+C2 = Pin(10)
+C3 = Pin(11)
+C4 = Pin(12)
+C5 = Pin(13)
+C6 = Pin(14)
+C7 = Pin(15)
+# C8 and C9 are not GPIO
+
+# create None type pins for I2C and SPI since they are expected to be defined
+SCL = Pin()
+SDA = Pin()
+SCK = SCLK = Pin()
+MOSI = Pin()
+MISO = Pin()
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