jepler/Adafruit_CircuitPython_CCS811
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Add a property setter for baseline

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This commit is contained in:
Anton Tinyakov 2020-04-25 00:25:39 -04:00
parent 3d65d3b617
commit 7279d2c075
1 changed files with 8 additions and 8 deletions
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16
adafruit_ccs811.py
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@ -44,7 +44,6 @@ from adafruit_register import i2c_bits
__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_CCS811.git"
_BASELINE_PACKING_FORMAT = "<H"
_ALG_RESULT_DATA = const(0x02)
_RAW_DATA = const(0x03)
@ -161,25 +160,26 @@ class CCS811:
@property
def baseline(self):
"""
The function read and return the current baseline value.
The propery reads and returns the current baseline value.
The returned value is packed into an integer.
Later the same integer can be passed `set_baseline` function
in order to set a new baseline.
Later the same integer can be used in order
to set a new baseline.
"""
buf = bytearray(3)
buf[0] = _BASELINE
with self.i2c_device as i2c:
i2c.write_then_readinto(buf, buf, out_end=1, in_start=1)
return struct.unpack(_BASELINE_PACKING_FORMAT, buf[1:])[0]
return struct.unpack("<H", buf[1:])[0]
def set_baseline(self, baseline_int):
@baseline.setter
def baseline(self, baseline_int):
"""
The function lets you set a new baseline. As an argument accepts
The property lets you set a new baseline. As a value accepts
integer which represents packed baseline 2 bytes value.
"""
buf = bytearray(3)
buf[0] = _BASELINE
struct.pack_into(_BASELINE_PACKING_FORMAT, buf, 1, baseline_int)
struct.pack_into("<H", buf, 1, baseline_int)
with self.i2c_device as i2c:
i2c.write(buf)