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Add constant_current_range selector for LED driving #6

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Merged
merged 1 commit into from
Jun 28, 2022
Merged

Add constant_current_range selector for LED driving #6

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10 changes: 10 additions & 0 deletions adafruit_aw9523.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
from adafruit_bus_device import i2c_device
from adafruit_register.i2c_struct import ROUnaryStruct, UnaryStruct
from adafruit_register.i2c_bit import RWBit
from adafruit_register.i2c_bits import RWBits
from micropython import const

__version__ = "0.0.0-auto.0"
Expand All @@ -46,6 +47,12 @@

# pylint: disable=invalid-name

# constant_current_range options
AW9523_4_4_RANGE = const(0) # Full range: 0 - 37 mA (typical)
AW9523_3_4_RANGE = const(1) # 3/4 range: 0 - 27.8 mA
AW9523_2_4_RANGE = const(2) # 2/4 range: 0 - 18.5 mA
AW9523_1_4_RANGE = const(3) # 1/4 range: 0 - 9.3 mA


class AW9523:
"""CircuitPython helper class for using the AW9523 GPIO expander"""
Expand All @@ -67,6 +74,9 @@ class AW9523:
# Whether port 0 is push-pull
port0_push_pull = RWBit(_AW9523_REG_GCR, 4)

# 256-step constant-current range selector 'ISEL' - choice of 'full' (4/4), 3/4, 2/4, or 1/4.
constant_current_range = RWBits(2, _AW9523_REG_GCR, 0)

def __init__(self, i2c_bus, address=_AW9523_DEFAULT_ADDR, reset=True):
self.i2c_device = i2c_device.I2CDevice(i2c_bus, address)
self._buffer = bytearray(2)
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