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make TCA work for slaves with same address or even in general #38

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make TCA work for slaves with same address or even in general #38

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3 changes: 3 additions & 0 deletions adafruit_tca9548a.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,19 +62,22 @@ def readfrom_into(self, address, buffer, **kwargs):
"""Pass through for readfrom_into."""
if address == self.tca.address:
raise ValueError("Device address must be different than TCA9548A address.")
self.tca.i2c.writeto(self.tca.address, self.channel_switch)
return self.tca.i2c.readfrom_into(address, buffer, **kwargs)

def writeto(self, address, buffer, **kwargs):
"""Pass through for writeto."""
if address == self.tca.address:
raise ValueError("Device address must be different than TCA9548A address.")
self.tca.i2c.writeto(self.tca.address, self.channel_switch)
return self.tca.i2c.writeto(address, buffer, **kwargs)

def writeto_then_readfrom(self, address, buffer_out, buffer_in, **kwargs):
"""Pass through for writeto_then_readfrom."""
# In linux, at least, this is a special kernel function call
if address == self.tca.address:
raise ValueError("Device address must be different than TCA9548A address.")
self.tca.i2c.writeto(self.tca.address, self.channel_switch)
return self.tca.i2c.writeto_then_readfrom(
address, buffer_out, buffer_in, **kwargs
)
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