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ad53xx: refactor offset_to_mu(), fix docs

This commit is contained in:
Robert Jördens 2018-03-24 15:45:42 +01:00
parent b0c8097025
commit a8f0ee1c86
1 changed files with 8 additions and 19 deletions
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27
artiq/coredevice/ad53xx.py
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@ -69,28 +69,17 @@ def ad53xx_cmd_read_ch(channel, op):
@portable @portable
def voltage_to_mu(voltage, offset_dacs=8192, vref=5.): def voltage_to_mu(voltage, offset_dacs=0x2000, vref=5.):
"""Returns the DAC register value required to produce a given output """Returns the DAC register value required to produce a given output
voltage, assuming offset and gain errors have been trimmed out. voltage, assuming offset and gain errors have been trimmed out.
:param voltage: Voltage Also used to return offset register value required to produce a given
:param offset_dacs: Register value for the two offset DACs (default voltage when the DAC register is set to mid-scale.
:0x1555)
:param vref: DAC reference voltage (default: 5.)
"""
return int(round(0x10000*(voltage/(4.*vref)) + offset_dacs*0x4))
@portable
def offset_to_mu(voltage, offset_dacs=8192, vref=5.):
"""Returns the offset register value required to produce a given voltage
when the DAC register is set to mid-scale.
An offset of V can be used to trim out a DAC offset error of -V. An offset of V can be used to trim out a DAC offset error of -V.
:param voltage: Offset voltage :param voltage: Voltage
:param offset_dacs: Register value for the two offset DACs (default :param offset_dacs: Register value for the two offset DACs
:0x1555) (default: 0x2000)
:param vref: DAC reference voltage (default: 5.) :param vref: DAC reference voltage (default: 5.)
""" """
return int(round(0x10000*(voltage/(4.*vref)) + offset_dacs*0x4)) return int(round(0x10000*(voltage/(4.*vref)) + offset_dacs*0x4))
@ -219,8 +208,8 @@ class AD53xx:
:param voltage: the offset voltage :param voltage: the offset voltage
""" """
self.write_offset_mu(channel, offset_to_mu(voltage, self.offset_dacs, self.write_offset_mu(channel, voltage_to_mu(voltage, self.offset_dacs,
self.vref)) self.vref))
@kernel @kernel
def write_dac_mu(self, channel, value): def write_dac_mu(self, channel, value):