SPI SLAVE DRIVER CODE FOR ESP32

[ANKITY]

Any one please share the code for spi slave driver for esp32.my requirement is like i have an stm32f4 board which act as the spi master and a spi slave program should run in the esp32 module. i got spi master prog for stm32 but slave program for esp32 when i searched i found an example in git but it is so confusing. please anyone share a simple code of spi slave driver.