Raspberry-at24c

Two-Wire Serial EEPROM Access Library for RaspberryPi.

I forked from eeprog-0.7.6-tear5.tar.gz

---

Memory size

Device	Number of Bits	Number of 8-bit Bytes	i2c address
24C02	2K	256	0x50-0x57
24C04	4K	512	0x50/0x52/0x54/0x56
24C08	8K	1024	0x50/0x54
24C16	16K	2048	0x50
24C32	32K	4096	0x50-0x57
24C64	64K	8192	0x50-0x57
24C128	128K	16384	0x50-0x57
24C256	256K	32768	0x50-0x57
24C512	512K	65536	0x50-0x57

---

Build

for 24C02
cc -o main main.c at24c.c -DC02

for 24C04
cc -o main main.c at24c.c -DC04

for 24C08
cc -o main main.c at24c.c -DC08

for 24C16
cc -o main main.c at24c.c -DC16

for 24C32
cc -o main main.c at24c.c -DC32

for 24C64
cc -o main main.c at24c.c -DC64

for 24C128
cc -o main main.c at24c.c -DC128

for 24C256
cc -o main main.c at24c.c -DC256

for 24C512
cc -o main main.c at24c.c -DC512

sudo ./main [i2c-address]
Default i2c-address is 0x50.

---

• 24C04
  

• 24C16
  

• 24C32
  

• 24C64
  

• 24C128
  

• 24C256
  

• 24C512
  

---

API

// Open device
int eeprom_open(char *dev_fqn, int i2c_addr, int bits, int delay, struct eeprom*);

// Get EEPROM memory size
__u16 getEEPROMbytes(struct eeprom* e);

// Read data from EEPROM
int eeprom_read_byte(struct eeprom* e, __u16 mem_addr);

// Write data to EEPROM
int eeprom_write_byte(struct eeprom *e, __u16 mem_addr, __u8 data);

---

Wireing

A0 A1 A2 is used to select i2c address.
When A0 A1 A2 is GND, i2c address is 0x50.