ESP32, SPI, at45dbxx data flash esp-idf\components\driver\include\driver\spi_master.h esp-idf\components\driver\include\driver\spi_common.h esp-idf\components\soc\esp32\include\soc\gpio_struct.h esp-idf\components\driver\include\driver\gpio.h 0. 참고 사이트esp-idf\examples\peripherals\spi_masterhttps://esp-idf.readthedocs.io/en/latest/api-reference/peripherals/spi_master.htmlhttps://github.com/espres..