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ad9910: fiducial timestamp for tracking phase mode 

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 time stamp. This is functionally equivalent to
:const:`PHASE_MODE_ABSOLUTE`. The only difference is the fiducial :const:`PHASE_MODE_ABSOLUTE`. The only difference is the fiducial
time stamp. This mode is also known as "coherent phase mode". 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` :math:`\phi(t) = p + (t - T) f`
Where: Where:
@ -281,6 +282,9 @@ class AD9910:
# Auto-clear phase accumulator on IO_UPDATE. # Auto-clear phase accumulator on IO_UPDATE.
# This is active already for the next IO_UPDATE # This is active already for the next IO_UPDATE
self.write32(_AD9910_REG_CFR1, 0x00002002) 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: if ref_time >= 0:
# 32 LSB are sufficient. # 32 LSB are sufficient.
# Also no need to use IO_UPDATE time as this # Also no need to use IO_UPDATE time as this