Feature set check may fail

[caternuson]

Re this thread:
https://forums.adafruit.com/viewtopic.php?t=201980

Return isn't as expected so check fails.

Not finding any reference to the feature set command in any of the SGP40 refs.

Adafruit_CircuitPython_SGP40/adafruit_sgp40/__init__.py

Lines 136 to 141 in 4f872a9

	# Check feature set
	self._command_buffer[0] = 0x20
	self._command_buffer[1] = 0x2F
	featureset = self._read_word_from_command()
	if featureset[0] != 0x3220:
	raise RuntimeError(f"Feature set does not match: {featureset[0]:#x}")

Maybe just remove the check?

[caternuson]

Just received a new version of the SGP40 breakout to compare to an older version.

Reading the "feature set" register manually for each:

OLDER BREAKOUT

Adafruit CircuitPython 7.3.3 on 2022-08-29; Adafruit QT Py RP2040 with rp2040
>>> import board
>>> i2c = board.STEMMA_I2C()
>>> i2c.try_lock()
True
>>> i2c.scan()
[89]
>>> buffer = bytearray(2)
>>> buffer[0] = 0x20
>>> buffer[1] = 0x2F
>>> i2c.writeto(89, buffer)
>>> i2c.readfrom_into(89, buffer)
>>> hex(buffer[0]), hex(buffer[1])
('0x32', '0x20')
>>>

NEWER BREAKOUT

Adafruit CircuitPython 7.3.3 on 2022-08-29; Adafruit QT Py RP2040 with rp2040
>>> import board
>>> i2c = board.STEMMA_I2C()
>>> i2c.try_lock()
True
>>> i2c.scan()
[89]
>>> buffer = bytearray(2)
>>> buffer[0] = 0x20
>>> buffer[1] = 0x2F
>>> i2c.writeto(89, buffer)
>>> i2c.readfrom_into(89, buffer)
>>> hex(buffer[0]), hex(buffer[1])
('0x32', '0x40')
>>> 

So the mask added by #20 should be an adequate fix.

[caternuson]

Closing. Should be fixed by #20.

See also #21 for some additional fixes that were discovered at the same time and patched in that PR.