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ad9914: minor fixes

This commit is contained in:
Sebastien Bourdeauducq 2018-05-14 10:37:50 +08:00
parent 194d6462ee
commit 56a18682a7
1 changed files with 9 additions and 2 deletions
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11
artiq/coredevice/ad9914.py
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@ -11,6 +11,12 @@ from artiq.coredevice.rtio import rtio_output
from numpy import int32, int64
__all__ = [
"AD9914",
"PHASE_MODE_CONTINUOUS", "PHASE_MODE_ABSOLUTE", "PHASE_MODE_TRACKING"
]
_PHASE_MODE_DEFAULT = -1
PHASE_MODE_CONTINUOUS = 0
PHASE_MODE_ABSOLUTE = 1
@ -54,7 +60,7 @@ class AD9914:
kernel_invariants = {"core", "sysclk", "bus_channel", "channel",
"rtio_period_mu", "sysclk_per_mu", "write_duration_mu",
"dac_cal_duration_mu", "init_duration_mu", "init_sync_duration_mu",
"set_duration_mu", "set_x_duration_mu"
"set_duration_mu", "set_x_duration_mu", "exit_x_duration_mu",
"continuous_phase_comp"}
def __init__(self, dmgr, sysclk, bus_channel, channel, core_device="core"):
@ -179,7 +185,8 @@ class AD9914:
"""Sets the DDS channel to the specified frequency and phase.
This uses machine units (FTW and POW). The frequency tuning word width
is 32, and the phase offset word width is 16.
is 32, the phase offset word width is 16, and the amplitude scale factor
width is 12.
The "frequency update" pulse is sent to the DDS with a fixed latency
with respect to the current position of the time cursor.