examples: add photon histogram

examples/photon_histogram.py

@@ -0,0 +1,52 @@
+from artiq.language.core import *
+from artiq.language.units import *
+from artiq.devices import corecom_serial, core, dds_core, rtio_core
+
+
+class PhotonHistogram(AutoContext):
+    parameters = "bd bdd pmt repeats nbins"
+
+    def report(self, i, n):
+        print(i, n)
+
+    @kernel
+    def cool_detect(self):
+        with parallel:
+            self.bd.pulse(200*MHz, 1*ms)
+            self.bdd.pulse(300*MHz, 1*ms)
+        self.bd.pulse(210*MHz, 100*us)
+        with parallel:
+            self.bd.pulse(220*MHz, 100*us)
+            self.pmt.count_rising(100*us)
+        self.bd.on(200*MHz)
+        self.bdd.on(300*MHz)
+        return self.pmt.sync()
+
+    @kernel
+    def run(self):
+        hist = array(0, self.nbins)
+
+        for i in range(self.repeats):
+            n = self.cool_detect()
+            if n >= self.nbins:
+                n = self.nbins-1
+            hist[n] += 1
+
+        for i in range(self.nbins):
+            self.report(i, hist[i])
+
+
+if __name__ == "__main__":
+    with corecom_serial.CoreCom() as com:
+        coredev = core.Core(com)
+        exp = PhotonHistogram(
+            core=coredev,
+            bd=dds_core.DDS(core=coredev, dds_sysclk=1*GHz,
+                            reg_channel=0, rtio_channel=1),
+            bdd=dds_core.DDS(core=coredev, dds_sysclk=1*GHz,
+                             reg_channel=1, rtio_channel=2),
+            pmt=rtio_core.RTIOCounter(core=coredev, channel=0),
+            repeats=100,
+            nbins=100
+        )
+        exp.run()