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urukul: make get_att_mu() not alter state 

Signed-off-by: Robert Jördens <rj@quartiq.de>
This commit is contained in:
Robert Jördens 2018-11-16 14:56:26 +00:00
parent d1eee7c0ea
commit 3ad68f65c5
1 changed files with 8 additions and 6 deletions
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14
artiq/coredevice/urukul.py
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@ -309,15 +309,17 @@ class CPLD:
def get_att_mu(self): def get_att_mu(self):
"""Return the digital step attenuator settings in machine units. """Return the digital step attenuator settings in machine units.
This method will also (as a side effect) write the attenuator
settings of all four channels.
:return: 32 bit attenuator settings :return: 32 bit attenuator settings
""" """
self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END | spi.SPI_INPUT, 32, self.bus.set_config_mu(SPI_CONFIG | spi.SPI_INPUT, 32,
SPIT_ATT_RD, CS_ATT) SPIT_ATT_RD, CS_ATT)
self.bus.write(self.att_reg) self.bus.write(0) # shift in zeros, shift out current value
return self.bus.read() self.bus.set_config_mu(SPI_CONFIG | spi.SPI_END, 32,
SPIT_ATT_WR, CS_ATT)
delay(10*us)
self.att_reg = self.bus.read()
self.bus.write(self.att_reg) # shift in current value again and latch
return self.att_reg
@kernel @kernel
def set_sync_div(self, div): def set_sync_div(self, div):