coredevice: merge pcf8574a into i2c

artiq/coredevice/i2c.py

@@ -207,3 +207,46 @@ class TCA6424A:
 
         self._write24(0x8c, 0)  # set all directions to output
         self._write24(0x84, outputs_le)  # set levels
+
+class PCF8574A:
+    """Driver for the PCF8574 I2C remote 8-bit I/O expander.
+
+    I2C transactions not real-time, and are performed by the CPU without
+    involving RTIO.
+    """
+    def __init__(self, dmgr, busno=0, address=0x7c, core_device="core"):
+        self.core = dmgr.get(core_device)
+        self.busno = busno
+        self.address = address
+
+    @kernel
+    def set(self, data):
+        """Drive data on the quasi-bidirectional pins.
+
+        :param data: Pin data. High bits are weakly driven high
+            (and thus inputs), low bits are strongly driven low.
+        """
+        i2c_start(self.busno)
+        try:
+            if not i2c_write(self.busno, self.address):
+                raise I2CError("PCF8574A failed to ack address")
+            if not i2c_write(self.busno, data):
+                raise I2CError("PCF8574A failed to ack data")
+        finally:
+            i2c_stop(self.busno)
+
+    @kernel
+    def get(self):
+        """Retrieve quasi-bidirectional pin input data.
+
+        :return: Pin data
+        """
+        i2c_start(self.busno)
+        ret = 0
+        try:
+            if not i2c_write(self.busno, self.address | 1):
+                raise I2CError("PCF8574A failed to ack address")
+            ret = i2c_read(self.busno, False)
+        finally:
+            i2c_stop(self.busno)
+        return ret

artiq/coredevice/pcf8574a.py

@@ -1,47 +0,0 @@
-from artiq.experiment import kernel
-from artiq.coredevice.i2c import (
-    i2c_start, i2c_write, i2c_read, i2c_stop, I2CError)
-
-
-class PCF8574A:
-    """Driver for the PCF8574 I2C remote 8-bit I/O expander.
-
-    I2C transactions not real-time, and are performed by the CPU without
-    involving RTIO.
-    """
-    def __init__(self, dmgr, busno=0, address=0x7c, core_device="core"):
-        self.core = dmgr.get(core_device)
-        self.busno = busno
-        self.address = address
-
-    @kernel
-    def set(self, data):
-        """Drive data on the quasi-bidirectional pins.
-
-        :param data: Pin data. High bits are weakly driven high
-            (and thus inputs), low bits are strongly driven low.
-        """
-        i2c_start(self.busno)
-        try:
-            if not i2c_write(self.busno, self.address):
-                raise I2CError("PCF8574A failed to ack address")
-            if not i2c_write(self.busno, data):
-                raise I2CError("PCF8574A failed to ack data")
-        finally:
-            i2c_stop(self.busno)
-
-    @kernel
-    def get(self):
-        """Retrieve quasi-bidirectional pin input data.
-
-        :return: Pin data
-        """
-        i2c_start(self.busno)
-        ret = 0
-        try:
-            if not i2c_write(self.busno, self.address | 1):
-                raise I2CError("PCF8574A failed to ack address")
-            ret = i2c_read(self.busno, False)
-        finally:
-            i2c_stop(self.busno)
-        return ret

doc/manual/core_drivers_reference.rst

@@ -65,13 +65,6 @@ Digital I/O drivers
 .. automodule:: artiq.coredevice.i2c
     :members:
 
-:mod:`artiq.coredevice.pcf8574a` module
-+++++++++++++++++++++++++++++++++++++++
-
-.. automodule:: artiq.coredevice.pcf8574a
-    :members:
-
-
 RF generation drivers
 ---------------------