Add support for FT2232H "microcontroller"

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

diff --git a/src/adafruit_blinka/microcontroller/ftdi_mpsse/mpsse/pin.py b/src/adafruit_blinka/microcontroller/ftdi_mpsse/mpsse/pin.py
new file mode 100644 (file)
index 0000000..6a0ea93
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/ftdi_mpsse/mpsse/pin.py
@@ -0,0 +1,66 @@
+"""MPSSE pin names"""
+
+
+class Pin:
+    """A basic Pin class for use with FTDI MPSSEs."""
+
+    IN = 0
+    OUT = 1
+    LOW = 0
+    HIGH = 1
+
+    mpsse_gpio = None
+
+    def __init__(self, pin_id=None, url="ftdi://ftdi:ft232h/1"):
+        # setup GPIO controller if not done yet
+        # use one provided by I2C as default
+        if not Pin.mpsse_gpio:
+            # pylint: disable=import-outside-toplevel
+            from pyftdi.i2c import I2cController
+
+            # pylint: enable=import-outside-toplevel
+
+            i2c = I2cController()
+            i2c.configure(url)
+            Pin.mpsse_gpio = i2c.get_gpio()
+        # check if pin is valid
+        if pin_id:
+            if Pin.mpsse_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):
+        """Initialize the Pin"""
+        if not self.id:
+            raise RuntimeError("Can not init a None type pin.")
+        # MPSSE does't have configurable internal pulls?
+        if pull:
+            raise ValueError("Internal pull up/down not currently supported.")
+        pin_mask = Pin.mpsse_gpio.pins | 1 << self.id
+        current = Pin.mpsse_gpio.direction
+        if mode == self.OUT:
+            current |= 1 << self.id
+        else:
+            current &= ~(1 << self.id)
+        Pin.mpsse_gpio.set_direction(pin_mask, current)
+
+    def value(self, val=None):
+        """Set or return the Pin Value"""
+        if not self.id:
+            raise RuntimeError("Can not access a None type pin.")
+        current = Pin.mpsse_gpio.read(with_output=True)
+        # read
+        if val is None:
+            return 1 if current & 1 << self.id != 0 else 0
+        # write
+        if val in (self.LOW, self.HIGH):
+            if val == self.HIGH:
+                current |= 1 << self.id
+            else:
+                current &= ~(1 << self.id)
+            # must mask out any input pins
+            Pin.mpsse_gpio.write(current & Pin.mpsse_gpio.direction)
+            return None
+        # release the kraken
+        raise RuntimeError("Invalid value for pin")
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