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artiq/artiq/coredevice/mirny.py

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"""RTIO driver for Mirny (4 channel GHz PLLs)
"""
from artiq.language.core import kernel, delay, portable
from artiq.language.units import us
from numpy import int32
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_WR = 4
SPIT_RD = 16
SPI_CS = 1
WE = 1 << 24
# supported CPLD code version
PROTO_REV_MATCH = 0x0
# almazny-specific data
ALMAZNY_REG_BASE = 0x0C
ALMAZNY_OE_SHIFT = 12
# higher SPI write divider to match almazny shift register timing
# min SER time before SRCLK rise = 125ns
# -> div=32 gives 125ns for data before clock rise
# works at faster dividers too but could be less reliable
ALMAZNY_SPIT_WR = 32
class Mirny:
"""
Mirny PLL-based RF generator.
:param spi_device: SPI bus device
:param refclk: Reference clock (SMA, MMCX or on-board 100 MHz oscillator)
frequency in Hz
:param clk_sel: Reference clock selection.
Valid options are: "XO" - onboard crystal oscillator;
"SMA" - front-panel SMA connector; "MMCX" - internal MMCX connector.
Passing an integer writes it as ``clk_sel`` in the CPLD's register 1.
The effect depends on the hardware revision.
:param core_device: Core device name (default: "core")
"""
kernel_invariants = {"bus", "core", "refclk", "clk_sel_hw_rev"}
def __init__(self, dmgr, spi_device, refclk=100e6, clk_sel="XO", core_device="core"):
self.core = dmgr.get(core_device)
self.bus = dmgr.get(spi_device)
# reference clock frequency
self.refclk = refclk
if not (10 <= self.refclk / 1e6 <= 600):
raise ValueError("Invalid refclk")
# reference clock selection
try:
self.clk_sel_hw_rev = {
# clk source: [reserved, reserved, v1.1, v1.0]
"xo": [-1, -1, 0, 0],
"mmcx": [-1, -1, 3, 2],
"sma": [-1, -1, 2, 3],
}[clk_sel.lower()]
except AttributeError: # not a string, fallback to int
if clk_sel & 0x3 != clk_sel:
raise ValueError("Invalid clk_sel") from None
self.clk_sel_hw_rev = [clk_sel] * 4
except KeyError:
raise ValueError("Invalid clk_sel") from None
self.clk_sel = -1
# board hardware revision
self.hw_rev = 0 # v1.0: 3, v1.1: 2
# TODO: support clk_div on v1.0 boards
@kernel
def read_reg(self, addr):
"""Read a register"""
self.bus.set_config_mu(
SPI_CONFIG | spi.SPI_INPUT | spi.SPI_END, 24, SPIT_RD, SPI_CS
)
self.bus.write((addr << 25))
return self.bus.read() & int32(0xFFFF)
@kernel
def write_reg(self, addr, data):
"""Write a register"""
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, 24, SPIT_WR, SPI_CS)
self.bus.write((addr << 25) | WE | ((data & 0xFFFF) << 8))
@kernel
def init(self, blind=False):
"""
Initialize and detect Mirny.
Select the clock source based the board's hardware revision.
Raise ValueError if the board's hardware revision is not supported.
:param blind: Verify presence and protocol compatibility. Raise ValueError on failure.
"""
reg0 = self.read_reg(0)
self.hw_rev = reg0 & 0x3
if not blind:
if (reg0 >> 2) & 0x3 != PROTO_REV_MATCH:
raise ValueError("Mirny PROTO_REV mismatch")
delay(100 * us) # slack
# select clock source
self.clk_sel = self.clk_sel_hw_rev[self.hw_rev]
if self.clk_sel < 0:
raise ValueError("Hardware revision not supported")
self.write_reg(1, (self.clk_sel << 4))
delay(1000 * us)
@portable(flags={"fast-math"})
def att_to_mu(self, att):
"""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 Mirny attenuation!")
return code
@kernel
def set_att_mu(self, channel, att):
"""Set digital step attenuator in machine units.
:param att: Attenuation setting, 8 bit digital.
"""
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, 16, SPIT_WR, SPI_CS)
self.bus.write(((channel | 8) << 25) | (att << 16))
@kernel
def set_att(self, channel, att):
"""Set digital step attenuator in SI units.
This method will write the attenuator settings of the selected channel.
.. seealso:: :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))
@kernel
def write_ext(self, addr, length, data, ext_div=SPIT_WR):
"""Perform SPI write to a prefixed address"""
self.bus.set_config_mu(SPI_CONFIG, 8, SPIT_WR, SPI_CS)
self.bus.write(addr << 25)
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, length, ext_div, SPI_CS)
if length < 32:
data <<= 32 - length
self.bus.write(data)
class Almazny:
"""
Almazny (High frequency mezzanine board for Mirny)
:param host_mirny - Mirny device Almazny is connected to
"""
def __init__(self, dmgr, host_mirny):
self.mirny_cpld = dmgr.get(host_mirny)
self.att_mu = [0x3f] * 4
self.channel_sw = [0] * 4
self.output_enable = False
@kernel
def init(self):
self.output_toggle(self.output_enable)
@kernel
def att_to_mu(self, att):
"""
Convert an attenuator setting in dB to machine units.
:param att: attenuator setting in dB [0-31.5]
:return: attenuator setting in machine units
"""
mu = round(att * 2.0)
if mu > 63 or mu < 0:
raise ValueError("Invalid Almazny attenuator settings!")
return mu
@kernel
def mu_to_att(self, att_mu):
"""
Convert a digital attenuator setting to dB.
:param att_mu: attenuator setting in machine units
:return: attenuator setting in dB
"""
return att_mu / 2
@kernel
def set_att(self, channel, att, rf_switch=True):
"""
Sets attenuators on chosen shift register (channel).
:param channel - index of the register [0-3]
:param att_mu - attenuation setting in dBm [0-31.5]
:param rf_switch - rf switch (bool)
"""
self.set_att_mu(channel, self.att_to_mu(att), rf_switch)
@kernel
def set_att_mu(self, channel, att_mu, rf_switch=True):
"""
Sets attenuators on chosen shift register (channel).
:param channel - index of the register [0-3]
:param att_mu - attenuation setting in machine units [0-63]
:param rf_switch - rf switch (bool)
"""
self.channel_sw[channel] = 1 if rf_switch else 0
self.att_mu[channel] = att_mu
self._update_register(channel)
@kernel
def output_toggle(self, oe):
"""
Toggles output on all shift registers on or off.
:param oe - toggle output enable (bool)
"""
self.output_enable = oe
cfg_reg = self.mirny_cpld.read_reg(1)
en = 1 if self.output_enable else 0
delay(100 * us)
new_reg = (en << ALMAZNY_OE_SHIFT) | (cfg_reg & 0x3FF)
self.mirny_cpld.write_reg(1, new_reg)
delay(100 * us)
@kernel
def _flip_mu_bits(self, mu):
# in this form MSB is actually 0.5dB attenuator
# unnatural for users, so we flip the six bits
return (((mu & 0x01) << 5)
| ((mu & 0x02) << 3)
| ((mu & 0x04) << 1)
| ((mu & 0x08) >> 1)
| ((mu & 0x10) >> 3)
| ((mu & 0x20) >> 5))
@kernel
def _update_register(self, ch):
self.mirny_cpld.write_ext(
ALMAZNY_REG_BASE + ch,
8,
self._flip_mu_bits(self.att_mu[ch]) | (self.channel_sw[ch] << 6),
ALMAZNY_SPIT_WR
)
delay(100 * us)
@kernel
def _update_all_registers(self):
for i in range(4):
self._update_register(i)
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