Initial Binho Nova plumbing

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / nova / i2c.py

diff --git a/src/adafruit_blinka/microcontroller/nova/i2c.py b/src/adafruit_blinka/microcontroller/nova/i2c.py
new file mode 100644 (file)
index 0000000..4e34a7d
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/nova/i2c.py
@@ -0,0 +1,37 @@
+from adafruit_blinka.microcontroller.nova.pin import Pin
+
+class I2C:
+
+    def __init__(self):
+        # change GPIO controller to I2C
+        from pyftdi.i2c import I2cController
+        self._i2c = I2cController()
+        self._i2c.configure('ftdi:///1')
+        Pin.ft232h_gpio = self._i2c.get_gpio()
+
+    def scan(self):
+        return [addr for addr in range(0x79) if self._i2c.poll(addr)]
+
+    def writeto(self, address, buffer, *, start=0, end=None, stop=True):
+        end = end if end else len(buffer)
+        port = self._i2c.get_port(address)
+        port.write(buffer[start:end], relax=stop)
+
+    def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
+        end = end if end else len(buffer)
+        port = self._i2c.get_port(address)
+        result = port.read(len(buffer[start:end]), relax=stop)
+        for i, b in enumerate(result):
+            buffer[start+i] = b
+
+    def writeto_then_readfrom(self, address, buffer_out, buffer_in, *,
+                              out_start=0, out_end=None,
+                              in_start=0, in_end=None, stop=False):
+        out_end = out_end if out_end else len(buffer_out)
+        in_end = in_end if in_end else len(buffer_in)
+        port = self._i2c.get_port(address)
+        result = port.exchange(buffer_out[out_start:out_end],
+                               in_end-in_start,
+                               relax=True).tobytes()
+        for i, b in enumerate(result):
+            buffer_in[in_start+i] = b