30 lines
1.2 KiB
ReStructuredText
30 lines
1.2 KiB
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Quadrature Encoder Drivers
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NuttX supports a low-level, two-part Quadrature Encoder driver.
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#. An "upper half", generic driver that provides the common
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Quadrature Encoder interface to application level code, and
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#. A "lower half", platform-specific driver that implements the
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low-level timer controls to implement the Quadrature Encoder
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functionality.
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Files supporting the Quadrature Encoder can be found in the
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following locations:
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- **Interface Definition**. The header file for the NuttX
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Quadrature Encoder driver reside at
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``include/nuttx/sensors/qencoder.h``. This header file includes
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both the application level interface to the Quadrature Encoder
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driver as well as the interface between the "upper half" and
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"lower half" drivers. The Quadrature Encoder module uses a
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standard character driver framework.
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- **"Upper Half" Driver**. The generic, "upper half" Quadrature
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Encoder driver resides at ``drivers/sensors/qencoder.c``.
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- **"Lower Half" Drivers**. Platform-specific Quadrature Encoder
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drivers reside in
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``arch/``\ *<architecture>*\ ``/src/``\ *<hardware>* directory
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for the specific processor *<architecture>* and for the
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specific *<chip>* Quadrature Encoder peripheral devices.
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