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suservo: refactor y_mu_to_full_scale as portable 

close #1032
This commit is contained in:
Robert Jördens 2018-05-31 16:44:14 +00:00
parent e136709cac
commit 36dcea3edf
1 changed files with 20 additions and 7 deletions
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27
artiq/coredevice/suservo.py
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@ -1,4 +1,4 @@
from artiq.language.core import kernel, delay, now_mu, delay_mu
from artiq.language.core import kernel, delay, now_mu, delay_mu, portable
from artiq.language.units import us, ns
from artiq.coredevice.rtio import rtio_output, rtio_input_data
from artiq.coredevice import spi2 as spi
@ -15,6 +15,21 @@ T_CYCLE = (2*(8 + 64) + 2 + 1)*8*ns
COEFF_SHIFT = 11
@portable
def y_mu_to_full_scale(y):
"""Convert Servo Y data from machine units to units of full scale."""
return y*(1./(1 << COEFF_WIDTH - 1))
@portable
def adc_mu_to_volts(x, gain):
"""Convert Servo ADC data from machine units to Volt."""
val = (x >> 1) & 0xffff
mask = 1 << 15
val = -(val & mask) + (val & ~mask)
return sampler.adc_mu_to_volt(val, gain)
class SUServo:
"""Sampler-Urukul Servo parent and configuration device.
@ -69,7 +84,7 @@ class SUServo:
self.channel = channel
self.gains = gains
self.ref_period_mu = self.core.seconds_to_mu(
self.core.coarse_ref_period)
self.core.coarse_ref_period)
assert self.ref_period_mu == self.core.ref_multiplier
@kernel
@ -206,11 +221,9 @@ class SUServo:
:param adc: ADC channel number (0-7)
:return: ADC voltage
"""
val = (self.get_adc_mu(channel) >> 1) & 0xffff
mask = 1 << 15
val = -(val & mask) + (val & ~mask)
val = self.get_adc_mu(channel)
gain = (self.gains >> (channel*2)) & 0b11
return sampler.adc_mu_to_volt(val, gain)
return adc_mu_to_volts(val, gain)
class Channel:
@ -449,7 +462,7 @@ class Channel:
:param profile: Profile number (0-31)
:return: IIR filter output in Y0 units of full scale
"""
return self.get_y_mu(profile)*(1./(1 << COEFF_WIDTH - 1))
return y_mu_to_full_scale(self.get_y_mu(profile))
@kernel
def set_y_mu(self, profile, y):