From 8769066e890fe04c27fd1ac86d92e877c4fc2043 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Mon, 21 Jul 2014 13:22:07 -0600
Subject: [PATCH] compiler/devices: set initial time

---
 artiq/compiler/lower_time.py | 4 ++--
 artiq/devices/core.py        | 3 ++-
 artiq/devices/runtime.py     | 1 +
 examples/ttl_test.py         | 1 -
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/artiq/compiler/lower_time.py b/artiq/compiler/lower_time.py
index 00039dfad..61e9f83ba 100644
--- a/artiq/compiler/lower_time.py
+++ b/artiq/compiler/lower_time.py
@@ -33,10 +33,10 @@ class _TimeLowerer(ast.NodeTransformer):
 		else:
 			return node
 
-def lower_time(stmts, ref_period):
+def lower_time(stmts, ref_period, initial_time):
 	transformer = _TimeLowerer(ref_period)
 	new_stmts = [transformer.visit(stmt) for stmt in stmts]
 	new_stmts.insert(0, ast.copy_location(
-		ast.Assign(targets=[ast.Name("now", ast.Store())], value=ast.Num(0)),
+		ast.Assign(targets=[ast.Name("now", ast.Store())], value=ast.Num(initial_time)),
 		stmts[0]))
 	stmts[:] = new_stmts
diff --git a/artiq/devices/core.py b/artiq/devices/core.py
index bc6eb4dff..22fcd0ffc 100644
--- a/artiq/devices/core.py
+++ b/artiq/devices/core.py
@@ -17,7 +17,8 @@ class Core:
 		fold_constants(stmts)
 		unroll_loops(stmts, 50)
 		interleave(stmts)
-		lower_time(stmts, self.runtime_env.ref_period)
+		lower_time(stmts, self.runtime_env.ref_period,
+			getattr(self.runtime_env, "initial_time", 0))
 		fold_constants(stmts)
 
 		binary = get_runtime_binary(self.runtime_env, stmts)
diff --git a/artiq/devices/runtime.py b/artiq/devices/runtime.py
index 3b9330201..ca197fd6c 100644
--- a/artiq/devices/runtime.py
+++ b/artiq/devices/runtime.py
@@ -49,6 +49,7 @@ class LinkInterface:
 class Environment(LinkInterface):
 	def __init__(self, ref_period):
 		self.ref_period = ref_period
+		self.initial_time = 8000
 
 	def emit_object(self):
 		tm = lt.TargetMachine.new(triple="or1k", cpu="generic")
diff --git a/examples/ttl_test.py b/examples/ttl_test.py
index d07392920..74ac7bd1a 100644
--- a/examples/ttl_test.py
+++ b/examples/ttl_test.py
@@ -7,7 +7,6 @@ class TTLTest(MPO):
 
 	@kernel
 	def run(self):
-		delay(10*us)
 		i = 0
 		while i < 100000:
 			with parallel: