esp-idf/examples/peripherals/spi_master/hd_eeprom/README.md

Supported Targets	ESP32	ESP32-C2	ESP32-C3	ESP32-C5	ESP32-C6	ESP32-H2	ESP32-P4	ESP32-S2	ESP32-S3

SPI master half duplex EEPROM example

This code demonstrates how to use the SPI master half duplex mode to read/write a AT93C46D EEPROM (8-bit mode). There is also an Kconfig option EXAMPLE_USE_SPI1_PINS allowing use the SPI1 (bus with code Flash connected on official modules).

Connections

For different chip and host used, the connections may be different. Here show a example diagram of hardware connection, you can freely change the GPIO defined in start of main/spi_eeprom_main.c and change the hardware relatively.

	ESP32
Host	SPI1
VCC	3.3V
GND	GND
DO	7
DI	8
SK	6
CS	13
ORG	GND

Notes

If you meet timeout issues, please check your connections.