espHosted

Wi-Fi connectivity Setup over SPI

1. Setup

Supported Targets	ESP32	ESP32-S2	ESP32-S3	ESP32-C2	ESP32-C3	ESP32-C6

1.1 Hardware Setup/Connections

• In this setup, ESP board acts as a SPI peripheral and provides Wi-Fi capabilities to host. Please connect ESP board to STM32F769I board's CN12 Extension connecter with jumper cables as mentioned below. It may be good to use small length cables to ensure signal integrity.
• STM32F769I should be powered with correct incoming power rating. ESP peripheral can be powered through PC using micro-USB/USB-C cable. STM32 can be powered with mini-B cable. It is also used as USART connection for debug logs from host. Serial port communicaton program like tera term or minicom used to print the logs.
• BT/BLE support will be added in upcoming release.

Hardware connections for ESP32

STM32 Pin	ESP32 Pin	ESP32-S2/S3	ESP32-C2/C3/C6	Function
PB14 (D12)	IO19	IO13	IO2	MISO
PA12 (D13)	IO18	IO12	IO6	CLK
PB15 (D11)	IO23	IO11	IO7	MOSI
PA11 (D10)	IO5	IO10	IO10	CS
GND (pin2)	GND	GND	GND	GND
PJ1 (D2)	IO2	IO2	IO3	Handshake
PJ3 (D7)	IO4	IO4	IO4	Data Ready from ESP
PJ0 (D4)	EN	RST	RST	Reset ESP

• Use good quality extremely small (smaller than 10cm) jumper wires, all equal length
• Optionally, Add external pull-up of min 10k Ohm on CS line just to prevent bus floating
• In case of ESP32-S3, For avoidance of doubt, You can power using UART port