examples: add remote_exec_controller

examples/master/device_db.pyon

@@ -199,6 +199,20 @@
         "command": "lda_controller -p {port} --bind {bind} --simulation"
     },
 
+    "camera_sim": {
+        "type": "controller",
+        "host": "::1",
+        "port": 6283,
+        "target_name": "camera_sim",
+        "command": "./remote_exec_controller.py"
+    },
+    "camera_sim_rexec": {
+        "type": "controller_aux_target",
+        "controller": "camera_sim",
+        "target_name": "camera_sim_rexec"
+    },
+
+
     "ttl_out": "ttl0",
     "ttl_out_serdes": "ttl0",
 

examples/remote_exec_controller.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3.5
+
+import numpy as np
+from numba import jit
+
+from artiq.protocols.remote_exec import simple_rexec_server_loop
+
+
+@jit(nopython=True)
+def compute_picture(r, img_h, img_w,
+                    gaussian_w, gaussian_h,
+                    gaussian_cx, gaussian_cy,
+                    noise_level):
+    for y in range(img_h):
+        for x in range(img_w):
+            ds = ((gaussian_cx-x)/gaussian_w)**2 
+            ds += ((gaussian_cy-y)/gaussian_h)**2
+            r[x, y] = np.exp(-ds/2) + noise_level*np.random.random()
+
+
+class CameraSimulation:
+    def __init__(self):
+        self.img_w = 320
+        self.img_h = 200
+        self.gaussian_w = 4
+        self.gaussian_h = 3
+        self.gaussian_cx = self.img_w//2
+        self.gaussian_cy = self.img_h//2
+        self.noise_level = 0.1
+
+    def set_gaussian_width(self, wx, wy=None):
+        if wy is None:
+            wy = wx
+        self.gaussian_w = wx
+        self.gaussian_h = wy
+
+    def set_gaussian_center(self, x, y):
+        self.gaussian_cx = x
+        self.gaussian_cy = y
+
+    def set_noise_level(self, noise_level):
+        self.noise_level = noise_level
+
+    def get_picture(self):
+        r = np.empty((self.img_w, self.img_h))
+        compute_picture(r, self.img_h, self.img_w,
+            self.gaussian_w, self.gaussian_h,
+            self.gaussian_cx, self.gaussian_cy,
+            self.noise_level)
+        return r
+
+
+def main():
+    simple_rexec_server_loop("camera_sim", CameraSimulation(),
+                             "::1", 6283)
+
+if __name__ == "__main__":
+    main()