Merge pull request #216 from binhollc/master

[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
index f5ee718edaca00682ff64c25d08ae129189e88c0..19190704b841cb8b4ec22b541e29902468187a8f 100644 (file)
--- a/src/adafruit_blinka/microcontroller/nova/i2c.py
+++ b/src/adafruit_blinka/microcontroller/nova/i2c.py
@@ -1,12 +1,12 @@
 class I2C:
 
-    def __init__(self):
+    def __init__(self, *, frequency=400000):
         from adafruit_blinka.microcontroller.nova import Connection
         self._nova = Connection.getInstance()
         self._nova.setNumericalBase(10)
         self._nova.setOperationMode(0, "I2C")
         self._nova.setPullUpStateI2C(0, "EN")
-        self._nova.setClockI2C(0, 400000)
+        self._nova.setClockI2C(0, frequency)
 
     def scan(self):
 
@@ -26,7 +26,7 @@ class I2C:
 
         end = end if end else len(buffer)
 
-        self._nova.startI2C(0, address)
+        self._nova.startI2C(0, address<<1)
 
         for i in range(start, end): 
             self._nova.writeByteI2C(0, buffer[i])
@@ -40,11 +40,15 @@ class I2C:
 
         end = end if end else len(buffer)
 
-        result = self._nova.readBytesI2C(0, address, len(buffer[start:end]))
-        resp = result.split(" ")
+        result = self._nova.readBytesI2C(0, address<<1, len(buffer[start:end]))
 
-        for i in range(len(buffer[start:end])):
-            buffer[start+i] = resp[2+i]
+        if result != "-NG":
+            resp = result.split(" ")
+
+            for i in range(len(buffer[start:end])):
+                buffer[start+i] = int(resp[2+i])
+        else:
+            raise RuntimeError("Received error response from Binho Nova, result = " + result)
 
     def writeto_then_readfrom(self, address, buffer_out, buffer_in, *,
                               out_start=0, out_end=None,
@@ -53,15 +57,19 @@ class I2C:
         out_end = out_end if out_end else len(buffer_out)
         in_end = in_end if in_end else len(buffer_in)
 
-        self._nova.startI2C(0, address)
+        self._nova.startI2C(0, address<<1)
 
         for i in range(out_start, out_end): 
             self._nova.writeByteI2C(0, buffer_out[i])
 
         self._nova.endI2C(0, True)
 
-        result = self._nova.readBytesI2C(0, address, len(buffer_in[in_start:in_end]))
-        resp = result.split(" ")
+        result = self._nova.readBytesI2C(0, address<<1, len(buffer_in[in_start:in_end]))
 
-        for i in range(len(buffer_in[in_start:in_end])):
-            buffer_in[in_start+i] = resp[2+i]
+        if result != "-NG":
+            resp = result.split(" ")
+
+            for i in range(len(buffer_in[in_start:in_end])):
+                buffer_in[in_start+i] = int(resp[2+i])
+        else:
+            raise RuntimeError("Received error response from Binho Nova, result = " + result)