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William Clark 2024-01-07 17:31:20 +00:00
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README.md
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@ -13,6 +13,7 @@ A C89 driver for the 3-axis accelerometer LIS3DH. Supports both I2C and SPI.
> - Single-click detection
> - Double-click detection
> - 4D/6D orientation detection
> - Sleep-to-Wake/Return-to-Sleep
## Examples

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example/README.md
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@ -129,10 +129,10 @@ Inertial interrupt example, the interrupt line is kept active so long as the dev
# "Sleep to Wake" and "Return to Sleep"
The LIS3DH can be programmed to automatically switch to `LP` mode upon recognition of a specific event. Once the event is over, the device will return to whatever mode it was in before the event.
The LIS3DH can be programmed to automatically enter a slow, low-power mode until it detects a specific event (acceleration exceeding `threshold`). Then, it will enter the mode set in `cfg.{mode,rate}` and behave as normal, until the `duration` since the beginning of sensing event has elapsed.
When the experienced acceleration [OR combination of all axes] falls below the `threshold` value stored in `cfg.act_ths`, the device automatically switches to `LP` mode with an ODR of 10 Hz. The duration of "normal function", the Wake period duration, is specified in `cfg.act_dur`.
The device, if configured with any non-zero values in `cfg.act_ths` and `cfg.act_dur` immediately enters low-power mode and will remain so until it experiences an acceleration [OR combination of all axes] that exceeds `threshold`. Upon experiencing such an acceleration, the device will activate `INT2` (configurable) and for a period of time (specified in `cfg.act_dur`) behave as normal, i.e. use the mode set in `cfg`.
As soon as the experienced acceleration rises above the threshold, the device restores the original mode and ODR.
When the time period (specified in `cfg.act_dur`) has elapsed, the device will trigger on `INT2` (configurable) again, and enter low-power mode. This cycle continues indefinitely.
See file: `sleep-to-wake.c`.