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fastino: document/cleanup
* added documentation on `update`/`hold` mechanism * mask machine unit values * cleanup coredevice driver close #1518
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"""RTIO driver for the Fastino 32channel, 16 bit, 2.5 MS/s per channel,
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streaming DAC.
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TODO: Example, describe update/hold
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"""
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from artiq.language.core import kernel, portable, delay
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from artiq.coredevice.rtio import rtio_output, rtio_output_wide, rtio_input_data
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from artiq.coredevice.rtio import (rtio_output, rtio_output_wide,
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rtio_input_data)
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from artiq.language.units import us
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from artiq.language.types import TInt32, TList, TFloat
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from artiq.language.types import TInt32, TList
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class Fastino:
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"""Fastino 32-channel, 16-bit, 2.5 MS/s per channel streaming DAC
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The RTIO PHY supports staging DAC data before transmitting them by writing
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to the DAC RTIO addresses, if a channel is not "held" by setting its bit
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using :meth:`set_hold`, the next frame will contain the update. For the
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DACs held, the update is triggered explicitly by setting the corresponding
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bit using :meth:`set_update`. Update is self-clearing. This enables atomic
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DAC updates synchronized to a frame edge.
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The `log2_width=0` RTIO layout uses one DAC channel per RTIO address
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and a dense RTIO address space. The RTIO words are narrow.
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(32 bit compared to 512) and few-channel updates are efficient.
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There is the least amount of DAC state tracking in kernels,
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at the cost of more DMA and RTIO data.
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Other `log2_width` (up to `log2_width=5`) settings pack multiple
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(in powers of two) DAC channels into one group and into one RTIO write.
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The RTIO data width increases accordingly. The `log2_width`
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LSBs of the RTIO address for a DAC channel write must be zero and the
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address space is sparse.
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If `log2_width` is zero, the :meth:`set_dac`/:meth:`set_dac_mu` interface
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must be used. If non-zero, the :meth:`set_group`/:meth:`set_group_mu`
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interface must be used.
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:param channel: RTIO channel number
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:param core_device: Core device name (default: "core")
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:param log2_width: Width of DAC channel group (power of two,
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see the RTIO PHY for details). If zero, the
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:meth:`set_dac`/:meth:`set_dac_mu` interface must be used.
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If non-zero, the :meth:`set_group`/:meth:`set_group_mu`
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interface must be used. Value must match the corresponding value
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see the RTIO PHY for details). Value must match the corresponding value
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in the RTIO PHY.
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"""
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kernel_invariants = {"core", "channel", "width"}
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@ -94,7 +113,7 @@ class Fastino:
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:param voltage: Voltage in SI Volts.
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:return: DAC data word in machine units, 16 bit integer.
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"""
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return int(round((0x8000/10.)*voltage)) + 0x8000
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return (int(round((0x8000/10.)*voltage)) + 0x8000) & 0xffff
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@portable
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def voltage_group_to_mu(self, voltage, data):
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