phaser: add another sawg demo

artiq/examples/phaser/repository/demo.py

@@ -0,0 +1,50 @@
+from artiq.experiment import *
+
+
+class SAWGTest(EnvExperiment):
+    def build(self):
+        self.setattr_device("core")
+        self.setattr_device("led")
+        self.setattr_device("ttl_sma")
+
+        self.setattr_device("sawg0")
+        self.setattr_device("sawg1")
+        self.setattr_device("sawg2")
+        self.setattr_device("sawg3")
+
+    @kernel
+    def run(self):
+        self.core.break_realtime()
+        self.ttl_sma.output()
+
+        while True:
+            self.sawg0.set_amplitude(0.)
+            self.sawg0.set_frequency(0*MHz)
+            self.sawg1.set_amplitude(0.)
+            self.sawg1.set_frequency(0*MHz)
+            delay(20*ms)
+
+            self.sawg0.set_amplitude(.4)
+            self.sawg0.set_frequency(10*MHz)
+            self.sawg0.set_phase(0.)
+            self.sawg1.set_amplitude(.4)
+            self.sawg1.set_frequency(10*MHz)
+            self.sawg1.set_phase(0.)
+            self.ttl_sma.pulse(200*ns)
+            self.sawg1.set_amplitude(.1)
+            delay(200*ns)
+            self.sawg1.set_amplitude(-.4)
+            self.ttl_sma.pulse(200*ns)
+            self.sawg1.set_amplitude(.4)
+            delay(200*ns)
+            self.sawg1.set_phase(.25)
+            self.ttl_sma.pulse(200*ns)
+            self.sawg1.set_phase(.5)
+            delay(200*ns)
+            self.sawg0.set_phase(.5)
+            self.ttl_sma.pulse(200*ns)
+            self.sawg1.set_frequency(30*MHz)
+            delay(200*ns)
+            self.sawg1.set_frequency(10*MHz)
+            self.sawg1.set_phase(0.)
+            self.ttl_sma.pulse(200*ns)