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AD9910: Write correct number of bits to POW register (#1498) 

* coredevice.ad9910: Add return type hints to conversion functions

* coredevice.ad9910: Make set_pow write correct number of bits
The AD9910 expects 16 bits. Thus, if writing 32 bits to the POW register, the chip would likely enter a locked-up state.

* coredevice.ad9910: Correct data alignment in write_16

Co-authored-by: Robert Jördens <rj@quartiq.de>

* coredevice.ad9910: Add function to read from 16 bit registers

Co-authored-by: drmota <peter.drmota@physics.ox.ac.uk>
Co-authored-by: Robert Jördens <rj@quartiq.de>
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pmldrmota 2020-08-07 10:10:44 +02:00 committed by GitHub
parent 504f72a02c
commit 1df62862cd
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1 changed files with 31 additions and 4 deletions
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35
artiq/coredevice/ad9910.py
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@ -3,6 +3,7 @@ from numpy import int32, int64
from artiq.language.core import (
kernel, delay, portable, delay_mu, now_mu, at_mu)
from artiq.language.units import us, ms
from artiq.language.types import *
from artiq.coredevice import spi2 as spi
from artiq.coredevice import urukul
@ -222,6 +223,17 @@ class AD9910:
"""
self.phase_mode = phase_mode
@kernel
def write16(self, addr, data):
"""Write to 16 bit register.
:param addr: Register address
:param data: Data to be written
"""
self.bus.set_config_mu(urukul.SPI_CONFIG | spi.SPI_END, 24,
urukul.SPIT_DDS_WR, self.chip_select)
self.bus.write((addr << 24) | (data << 8))
@kernel
def write32(self, addr, data):
"""Write to 32 bit register.
@ -236,6 +248,21 @@ class AD9910:
urukul.SPIT_DDS_WR, self.chip_select)
self.bus.write(data)
@kernel
def read16(self, addr):
"""Read from 16 bit register.
:param addr: Register address
"""
self.bus.set_config_mu(urukul.SPI_CONFIG, 8,
urukul.SPIT_DDS_WR, self.chip_select)
self.bus.write((addr | 0x80) << 24)
self.bus.set_config_mu(
urukul.SPI_CONFIG | spi.SPI_END | spi.SPI_INPUT,
16, urukul.SPIT_DDS_RD, self.chip_select)
self.bus.write(0)
return self.bus.read()
@kernel
def read32(self, addr):
"""Read from 32 bit register.
@ -549,10 +576,10 @@ class AD9910:
:param pow_: Phase offset word to be stored, range: 0 to 0xffff.
"""
self.write32(_AD9910_REG_POW, pow_)
self.write16(_AD9910_REG_POW, pow_)
@portable(flags={"fast-math"})
def frequency_to_ftw(self, frequency):
def frequency_to_ftw(self, frequency) -> TInt32:
"""Return the 32-bit frequency tuning word corresponding to the given
frequency.
"""
@ -566,7 +593,7 @@ class AD9910:
return ftw / self.ftw_per_hz
@portable(flags={"fast-math"})
def turns_to_pow(self, turns):
def turns_to_pow(self, turns) -> TInt32:
"""Return the 16-bit phase offset word corresponding to the given phase
in turns."""
return int32(round(turns*0x10000)) & 0xffff
@ -578,7 +605,7 @@ class AD9910:
return pow_/0x10000
@portable(flags={"fast-math"})
def amplitude_to_asf(self, amplitude):
def amplitude_to_asf(self, amplitude) -> TInt32:
"""Return 14-bit amplitude scale factor corresponding to given
fractional amplitude."""
code = int32(round(amplitude * 0x3fff))