dds: support batches in driver

artiq/coredevice/dds.py

@@ -10,10 +10,30 @@ PHASE_MODE_ABSOLUTE = 1
 PHASE_MODE_TRACKING = 2
 
 
+class DDSBus(AutoDB):
+    """Core device Direct Digital Synthesis (DDS) bus batching driver.
+
+    Manages batching of DDS commands on a DDS shared bus."""
+    class DBKeys:
+        core = Device()
+
+    @kernel
+    def batch_enter(self):
+        """Starts a DDS command batch. All DDS commands are buffered
+        after this call, until ``batch_exit`` is called."""
+        syscall("dds_batch_enter", time_to_cycles(now()))
+
+    @kernel
+    def batch_exit(self):
+        """Ends a DDS command batch. All buffered DDS commands are issued
+        on the bus, and FUD is pulsed at the time the batch started."""
+        syscall("dds_batch_exit")
+
+
 class DDS(AutoDB):
     """Core device Direct Digital Synthesis (DDS) driver.
 
-    Controls DDS devices managed directly by the core device's runtime.
+    Controls one DDS channel managed directly by the core device's runtime.
 
     :param dds_sysclk: DDS system frequency, used for computing the frequency
         tuning words.
@@ -43,7 +63,7 @@ class DDS(AutoDB):
 
     @kernel
     def init(self):
-        """Resets and initializes the DDS."""
+        """Resets and initializes the DDS channel."""
         syscall("dds_init", time_to_cycles(now()), self.channel)
 
     @kernel

examples/master/ddb.pyon

@@ -50,6 +50,12 @@
         "arguments": {"channel": 18}
     },
 
+    "dds_bus": {
+        "type": "local",
+        "module": "artiq.coredevice.dds",
+        "class": "DDSBus",
+        "arguments": {}
+    },
     "dds0": {
         "type": "local",
         "module": "artiq.coredevice.dds",
@@ -123,6 +129,8 @@
     },
 
     "pmt": "pmt0",
-    "bd": "dds0",
-    "bdd": "dds1"
+    "bd_dds": "dds0",
+    "bd_sw": "ttl0",
+    "bdd_dds": "dds1",
+    "bdd_sw": "ttl1"
 }

examples/master/repository/dds_test.py

@@ -6,6 +6,7 @@ class DDSTest(Experiment, AutoDB):
 
     class DBKeys:
         core = Device()
+        dds_bus = Device()
         dds0 = Device()
         dds1 = Device()
         dds2 = Device()
@@ -16,9 +17,10 @@ class DDSTest(Experiment, AutoDB):
 
     @kernel
     def run(self):
-        # with dds_batch:
-        #     self.dds1.set(120*MHz)
-        #     self.dds2.set(200*MHz)
+        self.dds_bus.batch_enter()
+        self.dds1.set(120*MHz)
+        self.dds2.set(200*MHz)
+        self.dds_bus.batch_exit()
 
         for i in range(10000):
             if i & 0x200:

examples/master/repository/photon_histogram.py

@@ -6,8 +6,11 @@ class PhotonHistogram(Experiment, AutoDB):
 
     class DBKeys:
         core = Device()
-        bd = Device()
-        bdd = Device()
+        dds_bus = Device()
+        bd_dds = Device()
+        bd_sw = Device()
+        bdd_dds = Device()
+        bdd_sw = Device()
         pmt = Device()
 
         nbins = Argument(100)
@@ -22,21 +25,37 @@ class PhotonHistogram(Experiment, AutoDB):
         hist = Result()
         total = Result()
 
+    @kernel
+    def program_cooling(self):
+        self.dds_bus.batch_enter()
+        self.bd_dds.set(200*MHz)
+        self.bdd_dds.set(300*MHz)
+        self.dds_bus.batch_exit()
+
     @kernel
     def cool_detect(self):
         with parallel:
-            self.bd.pulse(200*MHz, 1*ms)
-            self.bdd.pulse(300*MHz, 1*ms)
-        self.bd.pulse(self.cool_f, 100*us)
+            self.bd_sw.pulse(1*ms)
+            self.bdd_sw.pulse(1*ms)
+
+        self.bd_dds.set(self.cool_f)
+        self.bd_sw.pulse(100*us)
+
+        self.bd_dds.set(self.detect_f)
         with parallel:
-            self.bd.pulse(self.detect_f, self.detect_t)
+            self.bd_sw.pulse(self.detect_t)
             self.pmt.gate_rising(self.detect_t)
-        self.bd.on(200*MHz)
-        self.bdd.on(300*MHz)
+
+        self.program_cooling()
+        self.bd_sw.on()
+        self.bdd_sw.on()
+
         return self.pmt.count()
 
     @kernel
     def run(self):
+        self.program_cooling()
+
         hist = [0 for _ in range(self.nbins)]
         total = 0