examples: add DMA LED blinker

artiq/examples/master/repository/coredevice_examples/simple/dma_blink.py

@@ -0,0 +1,26 @@
+from artiq.experiment import *
+
+
+class DMABlink(EnvExperiment):
+    def build(self):
+        self.setattr_device("core")
+        self.setattr_device("core_dma")
+        self.setattr_device("led")
+
+    @kernel
+    def record(self):
+        with self.core_dma.record("blink"):
+            for i in range(5):
+                self.led.pulse(100*ms)
+                delay(100*ms)
+            for i in range(5):
+                self.led.pulse(50*ms)
+                delay(50*ms)
+
+    @kernel
+    def run(self):
+        self.core.reset()
+        self.record()
+        self.core.break_realtime()
+        for i in range(5):
+            self.core_dma.replay("blink")