mirror of https://github.com/m-labs/artiq.git
dds: do not reset AD9914
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@ -18,7 +18,7 @@
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/* DAC calibration takes max. 1ms as per datasheet */
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#define DURATION_DAC_CAL (147000 << RTIO_FINE_TS_WIDTH)
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/* not counting final FUD */
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#define DURATION_INIT (10*DURATION_WRITE + DURATION_DAC_CAL)
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#define DURATION_INIT (8*DURATION_WRITE + DURATION_DAC_CAL)
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#define DURATION_PROGRAM (6*DURATION_WRITE) /* not counting FUD */
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#else
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@ -59,8 +59,17 @@ void dds_init(long long int timestamp, int channel)
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#endif
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channel <<= 1;
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DDS_WRITE(DDS_GPIO, channel);
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#ifndef DDS_AD9914
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/*
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* Resetting a AD9914 intermittently crashes it. It does not produce any
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* output until power-cycled.
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* Increasing the reset pulse length and the delay until the first write
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* to 300ns do not solve the problem.
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* The chips seem fine without a reset.
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*/
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DDS_WRITE(DDS_GPIO, channel | 1); /* reset */
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DDS_WRITE(DDS_GPIO, channel);
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#endif
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#ifdef DDS_AD9858
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/*
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