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ad9910: fiducial timestamp for tracking phase mode

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Signed-off-by: Robert Jördens <rj@quartiq.de>
This commit is contained in:
Robert Jördens 2018-11-05 12:17:16 +00:00
parent 2f6d3f79ff
commit 141cc7d99f
1 changed files with 4 additions and 0 deletions
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4
artiq/coredevice/ad9910.py
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@ -128,6 +128,7 @@ class AD9910:
time stamp. This is functionally equivalent to
:const:`PHASE_MODE_ABSOLUTE`. The only difference is the fiducial
time stamp. This mode is also known as "coherent phase mode".
The default fiducial time stamp is 0.
:math:`\phi(t) = p + (t - T) f`
Where:
@ -281,6 +282,9 @@ class AD9910:
# Auto-clear phase accumulator on IO_UPDATE.
# This is active already for the next IO_UPDATE
self.write32(_AD9910_REG_CFR1, 0x00002002)
if phase_mode == PHASE_MODE_TRACKING and ref_time < 0:
# set default fiducial time stamp
ref_time = 0
if ref_time >= 0:
# 32 LSB are sufficient.
# Also no need to use IO_UPDATE time as this