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basemod_att: add dB functions, document
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@ -11,7 +11,7 @@ class BaseModAtt:
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@kernel
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def reset(self):
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# HMC's incompetence in digital design an interfaces means that
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# HMC's incompetence in digital design and interfaces means that
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# the HMC542 needs a level low on RST_N and then a rising edge
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# on Latch Enable. Their "latch" isn't a latch but a DFF.
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# Of course, it also powers up with a random attenuation, and
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@ -27,6 +27,11 @@ class BaseModAtt:
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@kernel
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def set_mu(self, att0, att1, att2, att3):
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"""
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Sets the four attenuators on BaseMod.
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The values are in half decibels, between 0 (no attenuation)
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and 63 (31.5dB attenuation).
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"""
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word = (
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(att0 << 2) |
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(att1 << 10) |
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@ -37,9 +42,29 @@ class BaseModAtt:
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@kernel
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def get_mu(self):
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"""
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Retrieves the current settings of the four attenuators on BaseMod.
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"""
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word = self.shift_reg.get()
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att0 = (word >> 2) & 0x3f
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att1 = (word >> 10) & 0x3f
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att2 = (word >> 18) & 0x3f
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att3 = (word >> 26) & 0x3f
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return att0, att1, att2, att3
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@kernel
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def set(self, att0, att1, att2, att3):
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"""
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Sets the four attenuators on BaseMod.
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The values are in decibels.
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"""
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self.set_mu(round(att0*2.0), round(att1*2.0), round(att2*2.0), round(att3*2.0))
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@kernel
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def get(self):
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"""
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Retrieves the current settings of the four attenuators on BaseMod.
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The values are in decibels.
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"""
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att0, att1, att2, att3 = self.get_mu()
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return 0.5*att0, 0.5*att1, 0.5*att2, 0.5*att3
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@ -112,6 +112,13 @@ RF generation drivers
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:members:
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:mod:`artiq.coredevice.basemod_att` module
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++++++++++++++++++++++++++++++++++++++++++
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.. automodule:: artiq.coredevice.basemod_att
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:members:
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DAC/ADC drivers
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---------------
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