forked from M-Labs/artiq
devices/dds_core: add frequency_to_ftw and ftw_to_frequency
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@ -25,6 +25,22 @@ class DDS(AutoContext):
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kernel_attr = "previous_frequency"
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@portable
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def frequency_to_ftw(self, frequency):
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"""Returns the frequency tuning word corresponding to the given
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frequency.
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"""
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return int(2**32*frequency/self.dds_sysclk)
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@portable
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def ftw_to_frequency(self, ftw):
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"""Returns the frequency corresponding to the given frequency tuning
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word.
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"""
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return ftw*self.dds_sysclk/2**32
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@kernel
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def on(self, frequency):
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"""Sets the DDS channel to the specified frequency and turns it on.
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@ -47,7 +63,7 @@ class DDS(AutoContext):
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# the same time.
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fud_time = -1
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syscall("dds_program", self.reg_channel,
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int(2**32*frequency/self.dds_sysclk),
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self.frequency_to_ftw(frequency),
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fud_time)
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self.previous_frequency = frequency
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self.sw.on()
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