forked from M-Labs/artiq
1
0
Fork 0

ad53xx/zotino: enable overtemp shutdown and readback control

This commit is contained in:
Robert Jördens 2018-06-01 13:06:52 +00:00
parent b56d37eb63
commit 2c344686d9
2 changed files with 39 additions and 12 deletions

View File

@ -8,9 +8,11 @@ time is an error.
# Designed from the data sheets and somewhat after the linux kernel
# iio driver.
from numpy import int32
from artiq.language.core import (kernel, portable, delay_mu, delay, now_mu,
at_mu)
from artiq.language.units import ns
from artiq.language.units import ns, us
from artiq.coredevice import spi2 as spi
SPI_AD53XX_CONFIG = (0*spi.SPI_OFFLINE | 1*spi.SPI_END |
@ -28,14 +30,25 @@ AD53XX_SPECIAL_CONTROL = 1 << 16
AD53XX_SPECIAL_OFS0 = 2 << 16
AD53XX_SPECIAL_OFS1 = 3 << 16
AD53XX_SPECIAL_READ = 5 << 16
AD53XX_SPECIAL_AB0 = 6 << 16
AD53XX_SPECIAL_AB1 = 7 << 16
AD53XX_SPECIAL_AB2 = 8 << 16
AD53XX_SPECIAL_AB3 = 9 << 16
AD53XX_SPECIAL_AB = 11 << 16
# incorporate the channel offset (8, table 17) here
AD53XX_READ_X1A = 0x008 << 7
AD53XX_READ_X1B = 0x048 << 7
AD53XX_READ_OFFSET = 0x088 << 7
AD53XX_READ_GAIN = 0x0C8 << 7
AD53XX_READ_CONTROL = 0x101 << 7
AD53XX_READ_OFS0 = 0x102 << 7
AD53XX_READ_OFS1 = 0x103 << 7
AD53XX_READ_AB0 = 0x106 << 7
AD53XX_READ_AB1 = 0x107 << 7
AD53XX_READ_AB2 = 0x108 << 7
AD53XX_READ_AB3 = 0x109 << 7
@portable
@ -61,10 +74,10 @@ def ad53xx_cmd_read_ch(channel, op):
:param channel: DAC channel to read (8 bits)
:param op: The channel register to read, one of
:const:`AD53XX_READ_X1A`, :const:`AD53XX_READ_X1B`,
:const:`AD53XX_READ_OFFSET`, :const:`AD53XX_CMD_GAIN` etc.
:const:`AD53XX_READ_OFFSET`, :const:`AD53XX_READ_GAIN` etc.
:return: The 24-bit word to be written to the DAC to initiate read
"""
return (AD53XX_CMD_SPECIAL | AD53XX_SPECIAL_READ | (op + (channel << 7)))
return AD53XX_CMD_SPECIAL | AD53XX_SPECIAL_READ | (op + (channel << 7))
@portable
@ -110,9 +123,9 @@ class AD53xx:
valid)
:param vref: DAC reference voltage (default: 5.)
:param offset_dacs: Initial register value for the two offset DACs, device
dependent and must be set correctly for correct voltage to mu conversions.
Knowledge of his state is not transferred between experiments.
(default: 8192)
dependent and must be set correctly for correct voltage to mu
conversions. Knowledge of his state is not transferred between
experiments. (default: 8192)
:param core_device: Core device name (default: "core")
"""
kernel_invariants = {"bus", "ldac", "clr", "chip_select", "div_write",
@ -139,19 +152,32 @@ class AD53xx:
self.core = dmgr.get(core)
@kernel
def init(self):
"""Configures the SPI bus, drives LDAC and CLR high and programmes
the offset DACss.
def init(self, blind=False):
"""Configures the SPI bus, drives LDAC and CLR high, programmes
the offset DACs, and enables overtemperature shutdown.
This method must be called before any other method at start-up or if
the SPI bus has been accessed by another device.
This method advances the timeline by one coarse RTIO cycle.
This method advances the timeline by several SPI transfers plus 10 µs.
:param blind: If ``True``, do not attempt to read back control register
or check for overtemperature.
"""
self.ldac.on()
self.clr.on()
self.bus.set_config_mu(SPI_AD53XX_CONFIG, 24, self.div_write,
self.chip_select)
self.write_offset_dacs_mu(self.offset_dacs)
self.bus.write( # enable overtemperature shutdown
(AD53XX_CMD_SPECIAL | AD53XX_SPECIAL_CONTROL | 0b0010) << 8)
if blind:
return
ctrl = self.read_reg(channel=0, op=AD53XX_READ_CONTROL)
if ctrl & 0b10000:
raise ValueError("DAC over temperature")
if ctrl != 0b0010:
raise ValueError("DAC CONTROL readback mismatch")
delay(10*us)
@kernel
def read_reg(self, channel=0, op=AD53XX_READ_X1A):
@ -173,7 +199,8 @@ class AD53xx:
self.bus.write((AD53XX_CMD_SPECIAL | AD53XX_SPECIAL_NOP) << 8)
self.bus.set_config_mu(SPI_AD53XX_CONFIG, 24, self.div_write,
self.chip_select)
return self.bus.read() & 0xffff
# FIXME: the int32 should not be needed to resolve unification
return self.bus.read() & int32(0xffff)
@kernel
def write_offset_dacs_mu(self, value):

View File

@ -253,7 +253,7 @@ class KasliTester(EnvExperiment):
def set_zotino_voltages(self, zotino, voltages):
self.core.break_realtime()
zotino.init()
delay(100*us)
delay(200*us)
i = 0
for voltage in voltages:
zotino.write_dac(i, voltage)