SPISTM32TOESP32

In this project, the STM32 receives data from the ESP32 via SPI and responds with a fixed byte of 0xAB.
The ESP32 initiates a transmission (Master) and receives a response every second.
Each successful transmission is accompanied by a blinking LED on both boards, indicating live communication.

The project demonstrates the implementation of SPI Slave on STM32 and integration with ESP32 as Master for stable data transfer between platforms.