Added GreatFET One Support

[hackapet/Adafruit_Blinka.git] / src / adafruit_blinka / microcontroller / nxp_lpc4330 / i2c.py

diff --git a/src/adafruit_blinka/microcontroller/nxp_lpc4330/i2c.py b/src/adafruit_blinka/microcontroller/nxp_lpc4330/i2c.py
new file mode 100644 (file)
index 0000000..e37fae1
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/nxp_lpc4330/i2c.py
@@ -0,0 +1,47 @@
+"""I2C Class for NXP LPC4330"""
+from greatfet import GreatFET
+
+
+class I2C:
+    """Custom I2C Class for NXP LPC4330"""
+
+    def __init__(self, *, frequency=100000):
+        self._gf = GreatFET()
+
+    def scan(self):
+        """Perform an I2C Device Scan"""
+        return [index for index, dev in enumerate(self._gf.i2c.scan()) if dev[0]]
+
+    # pylint: disable=unused-argument
+    def writeto(self, address, buffer, *, start=0, end=None, stop=True):
+        """Write data from the buffer to an address"""
+        if end is None:
+            end = len(buffer)
+        self._gf.i2c.write(address, buffer[start: end])
+
+    def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
+        """Read data from an address and into the buffer"""
+        if end is None:
+            end = len(buffer)
+        readin = self._gf.i2c.read(address, end - start)
+        for i in range(end - start):
+            buffer[i + start] = readin[i]
+    # pylint: enable=unused-argument
+
+    def writeto_then_readfrom(
+        self,
+        address,
+        buffer_out,
+        buffer_in,
+        *,
+        out_start=0,
+        out_end=None,
+        in_start=0,
+        in_end=None,
+        stop=False
+    ):
+        """Write data from buffer_out to an address and then
+        read data from an address and into buffer_in
+        """
+        self.writeto(address, buffer_out, start=out_start, end=out_end, stop=stop)
+        self.readfrom_into(address, buffer_in, start=in_start, end=in_end, stop=stop)