SPI EEPROM Access Library for RaspberryPi based on spidev_lib

Started from the nopnop2002 / Raspberry-spi-eeprom project, but that used one the wiringPi lib which no longer exist. This now uses spidev_lib and contains those files so it has no dependencies that might disappear in some dark future.

And the code has been cleaned up a bit with error handling, timeouts, ...

I only used it with an M95640.

Use at your own risk, I just needed something quick to read and write that eeprom.

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Memory size

ST Micro

There are several variations in the M95 series.
4.5 V to 5.5 V for M95xxx
2.5 V to 5.5 V for M95xxx-W
1.8 V to 5.5 V for M95xxx-R

For the > 4.5V version you will likely need to add a level shifter as the GPIO's of the pi are 3v3 (though it might be juuust high enough for the chip to detect them, it is for sure a bit dodgy)

Device	# of Bits	# of Bytes	Byte Address range	Page Size(Byte)	Page Address Range
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

ATMEL

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

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Build

ST Micro

for M95080
cc -o main main main.c eeprom.c spidev_lib.c -DM95080

for M95160
cc -o main main main.c eeprom.c spidev_lib.c -DM95160

for M95320
cc -o main main main.c eeprom.c spidev_lib.c -DM95320

for M95640
cc -o main main main.c eeprom.c spidev_lib.c -DM95640

for M95128
cc -o main main main.c eeprom.c spidev_lib.c -DM95128

for M95256
cc -o main main main.c eeprom.c spidev_lib.c -DM95256

ATMEL

for AT25010
cc -o main main main.c eeprom.c spidev_lib.c -DAT25010

for AT25020
cc -o main main main.c eeprom.c spidev_lib.c -DAT25020

for AT25040
cc -o main main main.c eeprom.c spidev_lib.c -DAT25040

for AT25080
cc -o main main main.c eeprom.c spidev_lib.c -DAT25080

for AT25160
cc -o main main main.c eeprom.c spidev_lib.c -DAT25160

for AT25320
cc -o main main main.c eeprom.c spidev_lib.c -DAT25320

for AT25640
cc -o main main main.c eeprom.c spidev_lib.c -DAT25640

for AT25128
cc -o main main main.c eeprom.c spidev_lib.c -DAT25128

for AT25256
cc -o main main main.c eeprom.c spidev_lib.c -DAT25256

for AT25512
cc -o main main main.c eeprom.c spidev_lib.c -DAT25512

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Usage

Active spi 0 with 1 chip select line on pin 8 (for example)
sudo dtoverlay spi0-1cs cs0_pin=8 

To read the contents of a connected eeprom and write it to an output file contents.bin
./main -o contents.bin 

To write the contents to a connected EEPROM from an input file contents.bin
./main -i contents.bin

For a demo on how I used it to reset my airbag fault codes, see https://www.youtube.com/watch?v=igxfvGu9VB0