esp-idf-93Cx6

Three-Wire Serial EEPROM Access Library for esp-idf.

Configure

You have to set this config value with menuconfig.

CONFIG_MODEL
CONFIG_CS_GPIO
CONFIG_SK_GPIO
CONFIG_DI_GPIO
CONFIG_DO_GPIO

git clone https://github.com/nopnop2002/esp-idf-93Cx6
cd esp-idf-93Cx6
make menuconfig
make flash

Interface

It look like SPI.
But CS is ACTIVE HIGH.
And data bit is not always 8bit.

Memory size vs Organization

The 93Cx6 memory is organized either as bytes (x8) or as words (x16).
If Organization Select (ORG) is left unconnected (or connected to VCC) the x16 organization is selected.
When Organization Select (ORG) is connected to Ground (VSS) the x8 organization is selected.

Device	Number of Bits	Number of 8-bit Bytes	Number of 16-bit Words
93C46	1024	128	64
93C56	2048	256	128
93C66	4096	512	256
93C76	8192	1024	512
93C86	16384	2048	1024

API

// Open Memory Device
// model:EEPROM model(46/56/66/76/86)
// org:Organization Select(1=8Bit/2=16Bit)
int eeprom_open(EEPROM_T * dev, int16_t model, int16_t org, int16_t GPIO_CS, int16_t GPIO_SK, int16_t GPIO_DI, int16_t GPIO_DO)

// Erase/Write Enable
void eeprom_ew_enable(EEPROM_T *dev)

// Erase/Write Disable
void eeprom_ew_disable(EEPROM_T *dev);

// Check Erase/Write Enable
bool eeprom_is_ew_enabled(EEPROM_T *dev);

// Erase All Memory
void eeprom_erase_all(EEPROM_T *dev);

// Erase Byte or Word
void eeprom_erase(EEPROM_T *dev, uint16_t addr)

// Write All Memory with same Data
void eeprom_write_all(EEPROM_T *dev, uint16_t value)

// Write Data to Memory
void eeprom_write(EEPROM_T *dev, uint16_t addr, uint16_t value)

// Read Data from Memory
uint16_t eeprom_read(EEPROM_T *dev, uint16_t addr)