835c535e18
This is an I2C driver for the Awinic AW9523B I/O expander. As well as the supporting usual digital I/Os, this device features the ability to drive LEDs directly, and can control the drive current to each LED individually. The driver was derived from the PCA9555 driver, provides all the standard interfaces of an i/o expander driver. It also features support for the special features of the AW9523B through pin direction IOEXPANDER_DIRECTION_OUT_LED and IOEXPANDER_OPTION_NONGENERIC with AW9523B_OPTION_* options. The driver has a number of configurable features including interrupt handling and a shadow register mode based on the PCA9555 driver, plus new LED/dimming support. Testing was done using an ESP32S3 host and I2C connection to the Adafruit AW9523 breakout board. Signed-off-by: Zik Saleeba <zik@zikzak.net> |
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Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
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