From 1f545346e31da3969317f80fe55ee09bc7ff37a5 Mon Sep 17 00:00:00 2001
From: Robert Jordens <jordens@gmail.com>
Date: Sun, 5 Apr 2015 01:14:19 -0600
Subject: [PATCH] wavesynth: implement silence, add defaults, fix bias

---
 artiq/wavesynth/compute_samples.py | 44 ++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/artiq/wavesynth/compute_samples.py b/artiq/wavesynth/compute_samples.py
index b868e7b68..e1a16927e 100644
--- a/artiq/wavesynth/compute_samples.py
+++ b/artiq/wavesynth/compute_samples.py
@@ -11,8 +11,8 @@ class Spline:
 
     def next(self):
         r = self.c[0]
-        for i in range(len(self.c)-1):
-            self.c[i] += self.c[i+1]
+        for i in range(len(self.c) - 1):
+            self.c[i] += self.c[i + 1]
         return r
 
 
@@ -30,8 +30,8 @@ class SplinePhase:
 
     def next(self):
         r = self.c[0] + self.c0
-        for i in range(len(self.c)-1):
-            self.c[i] = (self.c[i] + self.c[i+1]) % 1.0
+        for i in range(len(self.c) - 1):
+            self.c[i] = (self.c[i] + self.c[i + 1]) % 1.0
         return r
 
 
@@ -48,9 +48,14 @@ class Wave:
     def __init__(self):
         self.bias = Spline()
         self.dds = DDS()
+        self.last = 0.
+        self.silence = False
 
     def next(self):
-        return self.bias.next() + self.dds.next()
+        v = self.bias.next() + self.dds.next()
+        if not self.silence:
+            self.last = v
+        return self.last
 
 
 class TriggerError(Exception):
@@ -60,7 +65,7 @@ class TriggerError(Exception):
 class Synthesizer:
     def __init__(self, nchannels, program):
         self.channels = [Wave() for _ in range(nchannels)]
-        self.program = program 
+        self.program = program
         # line_iter is None: "wait for segment selection" state
         # otherwise: iterator on the current position in the segment
         self.line_iter = None
@@ -78,33 +83,41 @@ class Synthesizer:
         while True:
             line = next(self.line_iter)
 
-            if line["dac_divider"] != 1:
+            if line.get("dac_divider", 1) != 1:
                 raise NotImplementedError
 
             for channel, channel_data in zip(self.channels,
                                              line["channel_data"]):
                 if "bias" in channel_data:
-                    channel.bias.set_coefficients(channel_data["bias"])
+                    channel.bias.set_coefficients(channel_data["bias"]["amplitude"])
                 if "dds" in channel_data:
                     channel.dds.amplitude.set_coefficients(
                         channel_data["dds"]["amplitude"])
-                    channel.dds.phase.set_coefficients(
-                        channel_data["dds"]["phase"])
-                    if channel_data["dds"]["clear"]:
+                    if "phase" in channel_data["dds"]:
+                        channel.dds.phase.set_coefficients(
+                            channel_data["dds"]["phase"])
+                    if channel_data["dds"].get("clear", False):
                         channel.dds.phase.clear()
+                channel.silence = channel_data.get("silence", False)
 
             for channel, rc in zip(self.channels, r):
                 for i in range(line["duration"]):
                     rc.append(channel.next())
 
-            if line["wait_trigger"] and line["jump"]:
-                raise ValueError("Line cannot both jump and wait for trigger")
-            if line["wait_trigger"]:
+            if line.get("wait_trigger", False):
                 return r
-            if line["jump"]:
+            if line.get("jump", False):
+                if not line.get("wait_trigger", False):
+                    raise ValueError("Jumps should be with wait_trigger")
+                try:
+                    next(self.line_iter)
+                    raise ValueError("Jump in the middle of a frame")
+                except StopIteration:
+                    pass
                 self.line_iter = None
                 return r
 
+
 def main():
     from artiq.test.wavesynth import TestSynthesizer
     import cairoplot
@@ -114,5 +127,6 @@ def main():
     x, y = t.drive()
     cairoplot.scatter_plot("plot.png", [x, y])
 
+
 if __name__ == "__main__":
     main()