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drivers: sensor: bme280: fix "config" register intialization issue #90646

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merged 1 commit into from
May 29, 2025

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ljd42
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@ljd42 ljd42 commented May 27, 2025

A write to the "ctrl_meas" register can cause the sensor to transition from sleep to normal mode (which is default Kconfig settings). As per BME280 datasheet, writes to the "config" register in normal mode may be ignored. This can lead to use BME280_STANDBY_05MS and BME280_FILTER_OFF instead of the values set by the application. To fix this, write to the "config" register before "ctrl_meas" in the sensor init function.

Fixes: #89872.

A write to the "ctrl_meas" register can cause the sensor to transition
from sleep to normal mode (which is default Kconfig settings). As per
BME280 datasheet, writes to the "config" register in normal mode may be
ignored. This can lead to use BME280_STANDBY_05MS and BME280_FILTER_OFF
instead of the values set by the application. To fix this, write to the
"config" register before "ctrl_meas" in the sensor init function.

Signed-off-by: Loic Domaigne <tech@domaigne.com>
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@kartben kartben merged commit a8eace1 into zephyrproject-rtos:main May 29, 2025
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Hi @ljd42!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

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Thank you for your valuable input, and we look forward to seeing more of your contributions in the future! 🪁

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sensor: bme280 regulary fails to fetch samples
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