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shuttler: support pre-DAC gain & offset

This commit is contained in:
occheung 2023-09-13 16:43:53 -07:00 committed by Sébastien Bourdeauducq
parent c02a14ba37
commit 1bb7e9ceef
2 changed files with 95 additions and 6 deletions
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67
artiq/gateware/shuttler.py
View File

@ -100,11 +100,16 @@ class Dac(Module):
data (Signal[16]): Output value to be send to the DAC.
clear (Signal): Clear accumulated phase offset when loading a new
waveform. Input.
gain (Signal[16]): Output value gain. The gain signal represents the
decimal part os the gain in 2's complement.
offset (Signal[16]): Output value offset.
i (Endpoint[]): Coefficients of the output lines.
"""
def __init__(self):
self.clear = Signal()
self.data = Signal(16)
self.gain = Signal(16)
self.offset = Signal(16)
###
@ -113,8 +118,14 @@ class Dac(Module):
Dds(self.clear),
]
# Infer signed multiplication
data_raw = Signal((14, True))
data_buf = Signal(14)
self.sync.rio += [
self.data.eq(reduce(add, [sub.data for sub in subs])),
data_raw.eq(reduce(add, [sub.data for sub in subs])),
# Extra buffer for better DSP timing
data_buf.eq(((data_raw * Cat(self.gain, ~self.gain[-1])) + (self.offset << 16))[16:]),
self.data.eq(data_buf),
]
self.i = [ sub.i for sub in subs ]
@ -229,11 +240,43 @@ class Dds(Module):
class Config(Module):
def __init__(self):
self.clr = Signal(16, reset=0xFFFF)
self.i = Endpoint([("data", 16)])
self.gain = [ Signal(16) for _ in range(16) ]
self.offset = [ Signal(16) for _ in range(16) ]
reg_file = Array(self.gain + self.offset + [self.clr])
self.i = Endpoint([
("data", 16),
("addr", 7),
])
self.o = Endpoint([
("data", 16),
])
# This introduces 1 extra latency to everything in config
# See the latency/delay attributes in Volt & DDS Endpoints/rtlinks
self.sync.rio += If(self.i.stb, self.clr.eq(self.i.data))
#
# Gain & offsets are intended for initial calibration only, latency
# is NOT adjusted to match outputs to the DAC interface
#
# Interface address bits mapping:
# 6: Read bit. Assert to read, deassert to write.
# 5: Clear bit. Assert to write clr. clr is write-only.
# 4: Gain/Offset. (De)Assert to access (Gain)Offset registers.
# 0-3: Channel selection for the Gain & Offset registers.
#
# Reading Gain / Offset register generates an RTIOInput event
self.sync.rio += [
self.o.stb.eq(0),
If(self.i.stb,
If(~self.i.addr[6],
reg_file[self.i.addr[:6]].eq(self.i.data),
).Else(
# clr register is unreadable, as an optimization
self.o.data.eq(reg_file[self.i.addr[:5]]),
self.o.stb.eq(1),
)
),
]
Phy = namedtuple("Phy", "rtlink probes overrides")
@ -258,13 +301,23 @@ class Shuttler(Module, AutoCSR):
self.phys = []
self.submodules.cfg = Config()
cfg_rtl_iface = rtlink.Interface(rtlink.OInterface(
data_width=len(self.cfg.i.data),
enable_replace=False))
cfg_rtl_iface = rtlink.Interface(
rtlink.OInterface(
data_width=len(self.cfg.i.data),
address_width=len(self.cfg.i.addr),
enable_replace=False,
),
rtlink.IInterface(
data_width=len(self.cfg.o.data),
),
)
self.comb += [
self.cfg.i.stb.eq(cfg_rtl_iface.o.stb),
self.cfg.i.addr.eq(cfg_rtl_iface.o.address),
self.cfg.i.data.eq(cfg_rtl_iface.o.data),
cfg_rtl_iface.i.stb.eq(self.cfg.o.stb),
cfg_rtl_iface.i.data.eq(self.cfg.o.data),
]
self.phys.append(Phy(cfg_rtl_iface, [], []))
@ -277,6 +330,8 @@ class Shuttler(Module, AutoCSR):
dac = Dac()
self.comb += [
dac.clear.eq(self.cfg.clr[idx]),
dac.gain.eq(self.cfg.gain[idx]),
dac.offset.eq(self.cfg.offset[idx]),
self.dac_interface.data[idx // 2][idx % 2].eq(dac.data)
]

34
artiq/gateware/targets/efc.py
View File

@ -13,6 +13,7 @@ from artiq.gateware.amp import AMPSoC
from artiq.gateware import rtio
from artiq.gateware.rtio.xilinx_clocking import fix_serdes_timing_path
from artiq.gateware.rtio.phy import ttl_simple
from artiq.gateware.rtio.phy import spi2 as rtio_spi
from artiq.gateware.drtio.transceiver import eem_serdes
from artiq.gateware.drtio.rx_synchronizer import NoRXSynchronizer
from artiq.gateware.drtio import *
@ -145,6 +146,20 @@ class Satellite(BaseSoC, AMPSoC):
Subsignal('data', Pins('fmc0:HB13_N fmc0:HB12_N fmc0:HB13_P fmc0:HB12_P fmc0:HB15_N fmc0:HB15_P fmc0:HB11_N fmc0:HB09_N fmc0:HB09_P fmc0:HB14_N fmc0:HB14_P fmc0:HB10_N fmc0:HB10_P fmc0:HB11_P')),
Subsignal('clk', Pins('fmc0:HB06_CC_P')),
IOStandard('LVCMOS18')),
('afe_ctrl_dir', 0, Pins('fmc0:LA26_N fmc0:HB00_CC_N fmc0:HB17_CC_P'), IOStandard("LVCMOS18")),
('afe_ctrl_oe_n', 0, Pins('fmc0:HB19_N'), IOStandard("LVCMOS18")),
('afe_relay', 0,
Subsignal('clk', Pins('fmc0:LA02_N')),
Subsignal('mosi', Pins('fmc0:LA00_CC_N')),
Subsignal('cs_n', Pins('fmc0:LA02_P fmc0:LA01_CC_N')),
IOStandard("LVCMOS18")),
('afe_adc_spi', 0,
Subsignal('clk', Pins('fmc0:LA29_P')),
Subsignal('mosi', Pins('fmc0:LA29_N')),
Subsignal('miso', Pins('fmc0:LA30_N')),
Subsignal('cs_n', Pins('fmc0:LA28_P')),
IOStandard("LVCMOS18")),
('afe_adc_error_n', 0, Pins('fmc0:LA28_N'), IOStandard("LVCMOS18")),
]
platform.add_extension(shuttler_io)
@ -167,6 +182,25 @@ class Satellite(BaseSoC, AMPSoC):
self.csr_devices.append("shuttler")
self.rtio_channels.extend(rtio.Channel.from_phy(phy) for phy in self.shuttler.phys)
afe_dir = platform.request("afe_ctrl_dir")
self.comb += afe_dir.eq(0b011)
afe_oe = platform.request("afe_ctrl_oe_n")
self.comb += afe_oe.eq(0)
relay_led_phy = rtio_spi.SPIMaster(self.platform.request("afe_relay"))
self.submodules += relay_led_phy
print("SHUTTLER RELAY at RTIO channel 0x{:06x}".format(len(self.rtio_channels)))
self.rtio_channels.append(rtio.Channel.from_phy(relay_led_phy))
adc_error_n = platform.request("afe_adc_error_n")
self.comb += adc_error_n.eq(1)
adc_spi = rtio_spi.SPIMaster(self.platform.request("afe_adc_spi"))
self.submodules += adc_spi
print("SHUTTLER ADC at RTIO channel 0x{:06x}".format(len(self.rtio_channels)))
self.rtio_channels.append(rtio.Channel.from_phy(adc_spi))
self.config["HAS_RTIO_LOG"] = None
self.config["RTIO_LOG_CHANNEL"] = len(self.rtio_channels)
self.rtio_channels.append(rtio.LogChannel())