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Add address validation to initialization #57

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Add address validation to initialization #57

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12 changes: 12 additions & 0 deletions adafruit_tca9548a.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# SPDX-FileCopyrightText: 2018 Carter Nelson for Adafruit Industries

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#
# SPDX-License-Identifier: MIT

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"""Class which provides interface to TCA9548A I2C multiplexer."""

def __init__(self, i2c: I2C, address: int = _DEFAULT_ADDRESS) -> None:
tries = 0
while not i2c.try_lock():
if (tries >= 200):
raise ValueError("Unable to lock I2C bus.")
tries += 1
time.sleep(0)

if address not in i2c.scan():
i2c.unlock()
raise ValueError(f"No TCA9548A detected at {hex(address)}.")
i2c.unlock()

self.i2c = i2c
self.address = address
self.channels = [None] * 8
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