Arduino library for SPI based EEPROMs
With this library you can write data to and read data from SPI based EEPROMs of the 25 series, including small EEPROMs like the 25LC0x0A or ST950x0 with x = 1,2,4,8. Although it uses page writing, you don't have to worry about the page limits. You can directly write bytes, integers, floats and arrays. Furthermore, I have implemented functions to read and write strings. I have adopted the method of handling different variable types for put() and get() from Sparkfun's great library SparkFun_External_EEPROM_Arduino_Library for I2C EEPROMs.
I have implemented the protection options for the storage and and the status register.
The functions for erasing pages or sectors only work with the larger EEPROMs. Check the data sheet if you are not sure.
I have tested several EEPROMs (25LC512, 25A512, 25LC640, 25LC040A) using various MCU boards, such as the ESP32 development board, WEMOS D1 mini (ESP8266) and the Arduino Nano.
The library can now also deal with EEPROMs that use 24 bit addressing such as the 25CSM04. You need to set the memory size before accessing the EEPROM using the method setMemorySize. Note that this particular EEPROM25CSM04 does not support erase operations.
Here you find the detailed documentation:
https://wolles-elektronikkiste.de/en/eeprom-part-3-external-spi-eeproms (English)
https://wolles-elektronikkiste.de/eeprom-teil-3-externe-spi-eeproms (German)