Analog (ADC/DAC) Drivers
The NuttX analog drivers are split into two parts:
An “upper half”, generic driver that provides the common analog interface to application level code, and
A “lower half”, platform-specific driver that implements the low-level controls to implement the analog functionality.
General header files for the NuttX analog drivers reside in
include/nuttx/analog/
. These header files includes both the application level interface to the analog driver as well as the interface between the “upper half” and “lower half” drivers.Common analog logic and share-able analog drivers reside in the
drivers/analog/
.Platform-specific drivers reside in
arch/<architecture>/src/<hardware>
directory for the specific processor<architecture>
and for the specific<chip>
analog peripheral devices.
ADC Drivers
include/nuttx/analog/adc.h
. All structures and APIs needed to work with ADC drivers are provided in this header file. This header file includes:Structures and interface descriptions needed to develop a low-level, architecture-specific, ADC driver.
To register the ADC driver with a common ADC character driver.
Interfaces needed for interfacing user programs with the common ADC character driver.
drivers/analog/adc.c
. The implementation of the common ADC character driver.
DAC Drivers
include/nuttx/analog/dac.h
. All structures and APIs needed to work with DAC drivers are provided in this header file. This header file includes:Structures and interface descriptions needed to develop a low-level, architecture-specific, DAC driver.
To register the DAC driver with a common DAC character driver.
Interfaces needed for interfacing user programs with the common DAC character driver.
drivers/analog/dac.c
. The implementation of the common DAC character driver.