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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.