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

Supported Targets	ESP32	ESP32-C2	ESP32-C3	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.

	ESP32	ESP32	ESP32S2	ESP32C2	ESP32C3	ESP32S3
Host	SPI1	HSPI	SPI2	SPI2	SPI2	SPI2
VCC	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V
GND	GND	GND	GND	GND	GND	GND
DO	7	18	37	2	2	13
DI	8	23	35	7	7	11
SK	6	19	36	6	6	12
CS	13	13	34	10	10	10
ORG	GND	GND	GND	GND	GND	GND

Notes

If you meet timeout issues, please check your connections.