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AN4503 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN4503 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 26 page DocID026411 Rev 2 5/26 AN4503 Document overview 26 Figure 1. Android sensor HAL overview 1.1.1 Kernel This layer contains the Linux device drivers created using the input subsystem, a generic Linux framework for all input devices. The data are exported to the user space through the Sysfs virtual file system (/sys/class/input/). The driver sends/receives data to/from the sensor through the stable Linux subsystem I²C. 1.1.2 Sensor libraries These libraries are used to create a sophisticated interface for the upper layer. This is achieved through the sensor manager class, the sensor service class and the sensor HAL. 1.1.3 Application framework This is the layer that is used by the apk application to obtain data from the sensors. Communication begins in the SensorManager class, which creates an instance of the sensor service, and then proceeds to the lower layer through the sensor JNI (Java native interface). |
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