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https://github.com/m-labs/artiq.git
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parent
40baa8ecba
commit
f9910ab242
@ -48,23 +48,28 @@ class PCA9548:
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self.address = address
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@kernel
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def set(self, channel):
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"""Select one channel.
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def select(self, mask):
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"""Enable/disable channels.
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Selecting multiple channels at the same time is not supported by this
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driver.
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:param channel: channel number (0-7)
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:param mask: Bit mask of enabled channels
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"""
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i2c_start(self.busno)
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try:
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if not i2c_write(self.busno, self.address):
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raise I2CError("PCA9548 failed to ack address")
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if not i2c_write(self.busno, 1 << channel):
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if not i2c_write(self.busno, mask):
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raise I2CError("PCA9548 failed to ack control word")
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finally:
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i2c_stop(self.busno)
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@kernel
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def set(self, channel):
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"""Enable one channel.
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:param channel: channel number (0-7)
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"""
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self.select(1 << channel)
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@kernel
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def readback(self):
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i2c_start(self.busno)
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