This component used to reside in esp-idf project as its component.
It's used on the HOST, to communicate with ESP chips as SLAVE via SDIO/SPI slave HD mode.
The port layer (essl_sdio.c/essl_spi.c
) are currently only written to run on ESP chips in master mode, but you may also modify them to work on more platforms.
See more documentation: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/protocols/esp_serial_slave_link.html
soc/host_reg.h
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idf.py add-dependency "espressif/esp_serial_slave_link^1.1.0"
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