from numpy import int32, int64
from artiq.language.core import kernel, delay, portable, at_mu, now_mu
from artiq.language.units import us, ms
from artiq.language.types import TInt32, TFloat, TBool
from artiq.coredevice import spi2 as spi
SPI_CONFIG = (0 * spi.SPI_OFFLINE | 0 * spi.SPI_END |
0 * spi.SPI_INPUT | 1 * spi.SPI_CS_POLARITY |
0 * spi.SPI_CLK_POLARITY | 0 * spi.SPI_CLK_PHASE |
0 * spi.SPI_LSB_FIRST | 0 * spi.SPI_HALF_DUPLEX)
# SPI clock write and read dividers
SPIT_CFG_WR = 2
SPIT_CFG_RD = 16
# 30 MHz fmax, 20 ns setup, 40 ns shift to latch (limiting)
SPIT_ATT_WR = 6
SPIT_ATT_RD = 16
SPIT_DDS_WR = 2
SPIT_DDS_RD = 16
# CFG configuration register bit offsets
CFG_RF_SW = 0
CFG_LED = 4
CFG_PROFILE = 8
CFG_IO_UPDATE = 12
CFG_MASK_NU = 13
CFG_CLK_SEL0 = 17
CFG_CLK_SEL1 = 21
CFG_SYNC_SEL = 18
CFG_RST = 19
CFG_IO_RST = 20
CFG_CLK_DIV = 22
# STA status register bit offsets
STA_RF_SW = 0
STA_SMP_ERR = 4
STA_PLL_LOCK = 8
STA_IFC_MODE = 12
STA_PROTO_REV = 16
# supported hardware and CPLD code version
STA_PROTO_REV_MATCH = 0x08
# chip select (decoded)
CS_CFG = 1
CS_ATT = 2
CS_DDS_MULTI = 3
CS_DDS_CH0 = 4
CS_DDS_CH1 = 5
CS_DDS_CH2 = 6
CS_DDS_CH3 = 7
# Default profile
DEFAULT_PROFILE = 7
[docs]
@portable
def urukul_cfg(rf_sw, led, profile, io_update, mask_nu,
clk_sel, sync_sel, rst, io_rst, clk_div):
"""Build Urukul CPLD configuration register"""
return ((rf_sw << CFG_RF_SW) |
(led << CFG_LED) |
(profile << CFG_PROFILE) |
(io_update << CFG_IO_UPDATE) |
(mask_nu << CFG_MASK_NU) |
((clk_sel & 0x01) << CFG_CLK_SEL0) |
((clk_sel & 0x02) << (CFG_CLK_SEL1 - 1)) |
(sync_sel << CFG_SYNC_SEL) |
(rst << CFG_RST) |
(io_rst << CFG_IO_RST) |
(clk_div << CFG_CLK_DIV))
[docs]
@portable
def urukul_sta_rf_sw(sta):
"""Return the RF switch status from Urukul status register value."""
return (sta >> STA_RF_SW) & 0xf
[docs]
@portable
def urukul_sta_smp_err(sta):
"""Return the SMP_ERR status from Urukul status register value."""
return (sta >> STA_SMP_ERR) & 0xf
[docs]
@portable
def urukul_sta_pll_lock(sta):
"""Return the PLL_LOCK status from Urukul status register value."""
return (sta >> STA_PLL_LOCK) & 0xf
[docs]
@portable
def urukul_sta_ifc_mode(sta):
"""Return the IFC_MODE status from Urukul status register value."""
return (sta >> STA_IFC_MODE) & 0xf
[docs]
@portable
def urukul_sta_proto_rev(sta):
"""Return the PROTO_REV value from Urukul status register value."""
return (sta >> STA_PROTO_REV) & 0x7f
class _RegIOUpdate:
def __init__(self, cpld):
self.cpld = cpld
@kernel
def pulse(self, t: TFloat):
cfg = self.cpld.cfg_reg
self.cpld.cfg_write(cfg | (1 << CFG_IO_UPDATE))
delay(t)
self.cpld.cfg_write(cfg)
class _DummySync:
def __init__(self, cpld):
self.cpld = cpld
@kernel
def set_mu(self, ftw: TInt32):
pass
[docs]
class CPLD:
"""Urukul CPLD SPI router and configuration interface.
:param spi_device: SPI bus device name
:param io_update_device: IO update RTIO TTLOut channel name
:param dds_reset_device: DDS reset RTIO TTLOut channel name
:param sync_device: AD9910 ``SYNC_IN`` RTIO TTLClockGen channel name
:param refclk: Reference clock (SMA, MMCX or on-board 100 MHz oscillator)
frequency in Hz
:param clk_sel: Reference clock selection. For hardware revision >= 1.3
valid options are: 0 - internal 100MHz XO; 1 - front-panel SMA; 2
internal MMCX. For hardware revision <= v1.2 valid options are: 0 -
either XO or MMCX dependent on component population; 1 SMA. Unsupported
clocking options are silently ignored.
:param clk_div: Reference clock divider. Valid options are 0: variant
dependent default (divide-by-4 for AD9910 and divide-by-1 for AD9912);
1: divide-by-1; 2: divide-by-2; 3: divide-by-4.
On Urukul boards with CPLD gateware before v1.3.1 only the default
(0, i.e. variant dependent divider) is valid.
:param sync_sel: ``SYNC`` (multi-chip synchronisation) signal source selection.
0 corresponds to ``SYNC_IN`` being supplied by the FPGA via the EEM
connector. 1 corresponds to ``SYNC_OUT`` from DDS0 being distributed to the
other chips.
:param rf_sw: Initial CPLD RF switch register setting (default: 0x0).
Knowledge of this state is not transferred between experiments.
:param att: Initial attenuator setting shift register (default:
0x00000000). See also :meth:`get_att_mu` which retrieves the hardware
state without side effects. Knowledge of this state is not transferred
between experiments.
:param sync_div: ``SYNC_IN`` generator divider. The ratio between the coarse
RTIO frequency and the ``SYNC_IN`` generator frequency (default: 2 if
`sync_device` was specified).
:param core_device: Core device name
If the clocking is incorrect (for example, setting ``clk_sel`` to the
front panel SMA with no clock connected), then the ``init()`` method of
the DDS channels can fail with the error message ``PLL lock timeout``.
"""
kernel_invariants = {"refclk", "bus", "core", "io_update", "clk_div"}
def __init__(self, dmgr, spi_device, io_update_device=None,
dds_reset_device=None, sync_device=None,
sync_sel=0, clk_sel=0, clk_div=0, rf_sw=0,
refclk=125e6, att=0x00000000, sync_div=None,
core_device="core"):
self.core = dmgr.get(core_device)
self.refclk = refclk
assert 0 <= clk_div <= 3
self.clk_div = clk_div
self.bus = dmgr.get(spi_device)
if io_update_device is not None:
self.io_update = dmgr.get(io_update_device)
else:
self.io_update = _RegIOUpdate(self)
if dds_reset_device is not None:
self.dds_reset = dmgr.get(dds_reset_device)
if sync_device is not None:
self.sync = dmgr.get(sync_device)
if sync_div is None:
sync_div = 2
else:
self.sync = _DummySync(self)
assert sync_div is None
sync_div = 0
self.cfg_reg = urukul_cfg(rf_sw=rf_sw, led=0, profile=DEFAULT_PROFILE,
io_update=0, mask_nu=0, clk_sel=clk_sel,
sync_sel=sync_sel,
rst=0, io_rst=0, clk_div=clk_div)
self.att_reg = int32(int64(att))
self.sync_div = sync_div
[docs]
@kernel
def cfg_write(self, cfg: TInt32):
"""Write to the configuration register.
See :func:`urukul_cfg` for possible flags.
:param cfg: 24-bit data to be written. Will be stored at
:attr:`cfg_reg`.
"""
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, 24,
SPIT_CFG_WR, CS_CFG)
self.bus.write(cfg << 8)
self.cfg_reg = cfg
[docs]
@kernel
def sta_read(self) -> TInt32:
"""Read the status register.
Use any of the following functions to extract values:
* :func:`urukul_sta_rf_sw`
* :func:`urukul_sta_smp_err`
* :func:`urukul_sta_pll_lock`
* :func:`urukul_sta_ifc_mode`
* :func:`urukul_sta_proto_rev`
:return: The status register value.
"""
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END | spi.SPI_INPUT, 24,
SPIT_CFG_RD, CS_CFG)
self.bus.write(self.cfg_reg << 8)
return self.bus.read()
[docs]
@kernel
def init(self, blind: TBool = False):
"""Initialize and detect Urukul.
Resets the DDS I/O interface and verifies correct CPLD gateware
version.
Does not pulse the DDS ``MASTER_RESET`` as that confuses the AD9910.
:param blind: Do not attempt to verify presence and compatibility.
"""
cfg = self.cfg_reg
# Don't pulse MASTER_RESET (m-labs/artiq#940)
self.cfg_reg = cfg | (0 << CFG_RST) | (1 << CFG_IO_RST)
if blind:
self.cfg_write(self.cfg_reg)
else:
proto_rev = urukul_sta_proto_rev(self.sta_read())
if proto_rev != STA_PROTO_REV_MATCH:
raise ValueError("Urukul proto_rev mismatch")
delay(100 * us) # reset, slack
self.cfg_write(cfg)
if self.sync_div:
at_mu(now_mu() & ~0xf) # align to RTIO/2
self.set_sync_div(self.sync_div) # 125 MHz/2 = 1 GHz/16
delay(1 * ms) # DDS wake up
[docs]
@kernel
def io_rst(self):
"""Pulse IO_RST"""
self.cfg_write(self.cfg_reg | (1 << CFG_IO_RST))
self.cfg_write(self.cfg_reg & ~(1 << CFG_IO_RST))
[docs]
@kernel
def cfg_sw(self, channel: TInt32, on: TBool):
"""Configure the RF switches through the configuration register.
These values are logically OR-ed with the LVDS lines on EEM1.
:param channel: Channel index (0-3)
:param on: Switch value
"""
c = self.cfg_reg
if on:
c |= 1 << channel
else:
c &= ~(1 << channel)
self.cfg_write(c)
[docs]
@kernel
def cfg_switches(self, state: TInt32):
"""Configure all four RF switches through the configuration register.
:param state: RF switch state as a 4-bit integer.
"""
self.cfg_write((self.cfg_reg & ~0xf) | state)
[docs]
@portable(flags={"fast-math"})
def mu_to_att(self, att_mu: TInt32) -> TFloat:
"""Convert a digital attenuation setting to dB.
:param att_mu: Digital attenuation setting.
:return: Attenuation setting in dB.
"""
return (255 - (att_mu & 0xff)) / 8
[docs]
@portable(flags={"fast-math"})
def att_to_mu(self, att: TFloat) -> TInt32:
"""Convert an attenuation setting in dB to machine units.
:param att: Attenuation setting in dB.
:return: Digital attenuation setting.
"""
code = int32(255) - int32(round(att * 8))
if code < 0 or code > 255:
raise ValueError("Invalid urukul.CPLD attenuation!")
return code
[docs]
@kernel
def set_att_mu(self, channel: TInt32, att: TInt32):
"""Set digital step attenuator in machine units.
This method will also write the attenuator settings of the three
other channels. Use :meth:`get_att_mu` to retrieve the hardware
state set in previous experiments.
:param channel: Attenuator channel (0-3).
:param att: 8-bit digital attenuation setting:
255 minimum attenuation, 0 maximum attenuation (31.5 dB)
"""
a = self.att_reg & ~(0xff << (channel * 8))
a |= att << (channel * 8)
self.set_all_att_mu(a)
[docs]
@kernel
def set_all_att_mu(self, att_reg: TInt32):
"""Set all four digital step attenuators (in machine units).
See also :meth:`set_att_mu`.
:param att_reg: Attenuator setting string (32-bit)
"""
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, 32,
SPIT_ATT_WR, CS_ATT)
self.bus.write(att_reg)
self.att_reg = att_reg
[docs]
@kernel
def set_att(self, channel: TInt32, att: TFloat):
"""Set digital step attenuator in SI units.
This method will write the attenuator settings of all four channels.
See also :meth:`set_att_mu`.
:param channel: Attenuator channel (0-3).
:param att: Attenuation setting in dB. Higher value is more
attenuation. Minimum attenuation is 0*dB, maximum attenuation is
31.5*dB.
"""
self.set_att_mu(channel, self.att_to_mu(att))
[docs]
@kernel
def get_att_mu(self) -> TInt32:
"""Return the digital step attenuator settings in machine units.
The result is stored and will be used in future calls of
:meth:`set_att_mu` and :meth:`set_att`.
See also :meth:`get_channel_att_mu`.
:return: 32-bit attenuator settings
"""
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_INPUT, 32,
SPIT_ATT_RD, CS_ATT)
self.bus.write(0) # shift in zeros, shift out current value
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, 32,
SPIT_ATT_WR, CS_ATT)
delay(10 * us)
self.att_reg = self.bus.read()
self.bus.write(self.att_reg) # shift in current value again and latch
return self.att_reg
[docs]
@kernel
def get_channel_att_mu(self, channel: TInt32) -> TInt32:
"""Get digital step attenuator value for a channel in machine units.
The result is stored and will be used in future calls of
:meth:`set_att_mu` and :meth:`set_att`.
See also :meth:`get_att_mu`.
:param channel: Attenuator channel (0-3).
:return: 8-bit digital attenuation setting:
255 minimum attenuation, 0 maximum attenuation (31.5 dB)
"""
return int32((self.get_att_mu() >> (channel * 8)) & 0xff)
[docs]
@kernel
def get_channel_att(self, channel: TInt32) -> TFloat:
"""Get digital step attenuator value for a channel in SI units.
See also :meth:`get_channel_att_mu`.
:param channel: Attenuator channel (0-3).
:return: Attenuation setting in dB. Higher value is more
attenuation. Minimum attenuation is 0*dB, maximum attenuation is
31.5*dB.
"""
return self.mu_to_att(self.get_channel_att_mu(channel))
[docs]
@kernel
def set_sync_div(self, div: TInt32):
"""Set the ``SYNC_IN`` AD9910 pulse generator frequency
and align it to the current RTIO timestamp.
The ``SYNC_IN`` signal is derived from the coarse RTIO clock
and the divider must be a power of two.
Configure ``sync_sel == 0``.
:param div: ``SYNC_IN`` frequency divider. Must be a power of two.
Minimum division ratio is 2. Maximum division ratio is 16.
"""
ftw_max = 1 << 4
ftw = ftw_max // div
assert ftw * div == ftw_max
self.sync.set_mu(ftw)
[docs]
@kernel
def set_profile(self, profile: TInt32):
"""Set the PROFILE pins.
The PROFILE pins are common to all four DDS channels.
:param profile: PROFILE pins in numeric representation (0-7).
"""
cfg = self.cfg_reg & ~(7 << CFG_PROFILE)
cfg |= (profile & 7) << CFG_PROFILE
self.cfg_write(cfg)