esp-idf-spi-eeprom

SPI EEPROM Driver for esp-idf.

What is the difference between flash memory and EEPROM?
This is the difference between flash memory and EEPROM.

Software requirements

ESP-IDF V4.4/V5.0.
ESP-IDF V5.0 is required when using ESP32-C2.

Installation

git clone https://github.com/nopnop2002/esp-idf-spi-eeprom
cd esp-idf-spi-eeprom
idf.py set-target {esp32/esp32s2/esp32s3/esp32c2/esp32c3}
idf.py menuconfig
idf.py flash

Configuration

You have to set this config value with menuconfig.

• CONFIG_MODEL
• CONFIG_CS_GPIO
• CONFIG_SCLK_GPIO
• CONFIG_MISO_GPIO
• CONFIG_MOSI_GPIO

SPI BUS selection

The ESP32 series has three SPI BUSs.
SPI1_HOST is used for communication with Flash memory.
You can use SPI2_HOST and SPI3_HOST freely.
When you use SDSPI(SD Card via SPI), SDSPI uses SPI2_HOST BUS.
When using this module at the same time as SDSPI or other SPI device using SPI2_HOST, it needs to be changed to SPI3_HOST.
When you don't use SDSPI, both SPI2_HOST and SPI3_HOST will work.
Previously it was called HSPI_HOST / VSPI_HOST, but now it is called SPI2_HOST / SPI3_HOST.

Memory size

ST Micro

8 MHz Clock Rate.
There are several variations in the M95 series.
4.5 V to 5.5 V for M95xxx(Not available on ESP32)
2.5 V to 5.5 V for M95xxx-W
1.8 V to 5.5 V for M95xxx-R

Device	# of Bits	# of Bytes	Byte Address range	Page Size(Byte)	Page Address Range
M95010	1K	128	0x00-0x7F	16	0-7
M95020	2K	256	0x00-0xFF	16	0-15
M95040	4K	512	0x00-0x1FF	16	0-31
M95080	8K	1024	0x00-0x3FF	32	0-31
M95160	16K	2048	0x00-0x7FF	32	0-63
M95320	32K	4096	0x00-0xFFF	32	0-127
M95640	64K	8192	0x00-0x1FFF	32	0-255
M95128	128K	16384	0x00-0x3FFF	64	0-255
M95256	256K	32768	0x00-0x7FFF	64	0-511
M95512	512K	65536	0x00-0xFFFF	128	0-511

ATMEL

2 MHz Clock Rate.
2.7V to 5.5V

Device	# of Bits	# of Bytes	Byte Address Range	Page Size(Byte)	Page Address Range
AT25010	1K	128	0-0x7F	8	0-15
AT25020	2K	256	0-0xFF	8	0-31
AT25040	4K	512	0-0x1FF	8	0-63
AT25080	8K	1024	0-0x3FF	32	0-31
AT25160	16K	2048	0-0x7FF	32	0-63
AT25320	32K	4096	0-0xFFF	32	0-127
AT25640	64K	8192	0-0x1FFF	32	0-255
AT25128	128K	16384	0-0x3FFF	64	0-255
AT25256	256K	32768	0-0x7FFF	64	0-511
AT25512	512K	65536	0-0xFFFF	128	0-511

API

// Open device
void spi_master_init(EEPROM_t * dev, uint32_t model, int16_t GPIO_CS, int GPIO_MISO, int GPIO_MOSI, int GPIO_SCLK)

// Read Status Register (RDSR)
esp_err_t eeprom_ReadStatusReg(EEPROM_t * dev, uint8_t * reg)

// Busy check
bool eeprom_IsBusy(EEPROM_t * dev)

// Write enable check
bool eeprom_IsWriteEnable(EEPROM_t * dev)

// Set write enable
esp_err_t eeprom_WriteEnable(EEPROM_t * dev)

// Set write disable
esp_err_t eeprom_WriteDisable(EEPROM_t * dev)

// Read from Memory Array (READ)
int16_t eeprom_Read(EEPROM_t * dev, uint16_t addr, uint8_t *buf, int16_t n)

// Write to Memory Array (WRITE)
int16_t eeprom_WriteByte(EEPROM_t * dev, uint16_t addr, uint8_t wdata)

// Page Write to Memory Array (WRITE)
int16_t eeprom_WritePage(EEPROM_t * dev, int16_t pages, uint8_t* buf)

// Get total byte
int32_t eeprom_TotalBytes(EEPROM_t * dev)

// Get page size
int16_t eeprom_PageSize(EEPROM_t * dev)

// Get last page
int16_t eeprom_LastPage(EEPROM_t * dev)

Wireing

#	EEPROM		ESP32	ESP32-S2/S3	ESP32-C2/C3
1	/CS	--	GPIO5	GPIO34	GPIO0
2	MISO	--	GPIO19	GPIO37	GPIO2
3	/WP	--	3.3V	3.3V	3.3V
4	VSS	--	GND	GND	GND
5	MOSI	--	GPIO23	GPIO35	GPIO3
6	SCK	--	GPIO18	GPIO36	GPIO1
7	/HOLD	--	3.3V	3.3V	3.3V
8	VCC	--	3.3V	3.3V	3.3V

You can change any GPIO using menuconfig.

Serial Monitor