orange pi GPIO led blinky

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / generic_linux / libgpiod_pin.py

diff --git a/src/adafruit_blinka/microcontroller/generic_linux/libgpiod_pin.py b/src/adafruit_blinka/microcontroller/generic_linux/libgpiod_pin.py
new file mode 100644 (file)
index 0000000..51b87f9
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/generic_linux/libgpiod_pin.py
@@ -0,0 +1,74 @@
+try:
+    import gpiod
+except ImportError:
+    raise ImportError("libgpiod Python bindings not found, please install and try again! See https://github.com/adafruit/Raspberry-Pi-Installer-Scripts/blob/master/libgpiod.sh")
+
+# Pins dont exist in CPython so...lets make our own!
+class Pin:
+    IN = 0
+    OUT = 1
+    LOW = 0
+    HIGH = 1
+    PULL_NONE = 0
+    PULL_UP = 1
+    PULL_DOWN = 2
+    _CONSUMER = 'adafruit_blinka'
+
+    id = None
+    _value = LOW
+    _mode = IN
+
+    def __init__(self, pin_number, gpiod_chipname="gpiochip0"):
+        self.id = int(pin_number)
+        # FIXME: Presumably this might vary by system:
+        self._chip = gpiod.Chip(gpiod_chipname, gpiod.Chip.OPEN_BY_NAME)
+        self._line = None
+
+    def __repr__(self):
+        return str(self.id)
+
+    def __eq__(self, other):
+        return self.id == other
+
+    def init(self, mode=IN, pull=None):
+        if not self._line:
+            self._line = self._chip.get_line(int(self.id))
+            print("init line: ", int(self.id), self._line)
+
+        if mode != None:
+            if mode == self.IN:
+                flags = 0
+                if pull != None:
+                    if pull == self.PULL_UP:
+                        flags |= gpiod.LINE_REQ_FLAG_ACTIVE_LOW
+                    elif pull == self.PULL_DOWN:
+                        flags |= gpiod.LINE_REQ_FLAG_ACTIVE_HIGH
+                    else:
+                        raise RuntimeError("Invalid pull for pin: %s" % self.id)
+
+                self._mode = self.IN
+                self._line.release()
+                self._line.request(consumer=self._CONSUMER,
+                                   type=gpiod.LINE_REQ_DIR_IN,
+                                   flags=flags)
+
+            elif mode == self.OUT:
+                if pull != None:
+                    raise RuntimeError("Cannot set pull resistor on output")
+                self._mode = self.OUT
+                self._line.release()
+                self._line.request(consumer=self._CONSUMER,
+                                   type=gpiod.LINE_REQ_DIR_OUT)
+
+            else:
+                raise RuntimeError("Invalid mode for pin: %s" % self.id)
+
+    def value(self, val=None):
+        if val != None:
+            if val in (self.LOW, self.HIGH):
+                self._value = val
+                self._line.set_value(val)
+            else:
+                raise RuntimeError("Invalid value for pin")
+        else:
+            return self._line.get_value()