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Wait after initial reset until device is ready #28

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Merged
merged 3 commits into from
Sep 17, 2025
Merged

Wait after initial reset until device is ready #28

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9b865d0
Wait after initial reset until device is ready
Ultrawipf Sep 16, 2025
24433f5
Remove unused e for ruff formatter
Ultrawipf Sep 16, 2025
16689e0
Added timeout condition to waiting loop
Ultrawipf Sep 16, 2025
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15 changes: 13 additions & 2 deletions adafruit_mma8451.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@
"""

import struct
import time

from adafruit_bus_device import i2c_device
from micropython import const
Expand Down Expand Up @@ -127,8 +128,18 @@ def __init__(self, i2c: I2C, *, address: int = _MMA8451_DEFAULT_ADDRESS) -> None
raise RuntimeError("Failed to find MMA8451, check wiring!")
# Reset and wait for chip to be ready.
self._write_u8(_MMA8451_REG_CTRL_REG2, 0x40)
while self._read_u8(_MMA8451_REG_CTRL_REG2) & 0x40 > 0:
pass
attempts = 10
while attempts:
attempts -= 1
try:
if not self._read_u8(_MMA8451_REG_CTRL_REG2) & 0x40 > 0:
# Continue if chip is ready
break
# Ignore OSError. After reset the device may fail to respond
except OSError as e:
time.sleep(0.001)
if not attempts:
raise e
# Enable 4G range.
self._write_u8(_MMA8451_REG_XYZ_DATA_CFG, RANGE_4G)
# High resolution mode.
Expand Down