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The lower-half implementation of the RMT character driver based on Espressif HAL enables using the RMT peripheral of ESP32, ESP32-S2 and ESP32-S3 as a common xtensa-based Espressif driver. The RMT packages on Espressif SoCs are 4-byte long and are known as "items". Please check the Techinal Reference Manual of the chip to obtain more details.
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()).
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