This article presents a detailed explanation of the read and write program for the ICC--AT24C256 EEPROM using a microcontroller. It provides a general-purpose program that supports a range of 24C01 to 24C256 EEPROMs, allowing users to perform byte-level read and write operations efficiently.
The program is designed with five key parameters: a pointer to the data buffer for reading or writing, the number of bytes to be processed, the starting address in the EEPROM, the control byte, and the specific EEPROM type. These inputs ensure flexibility and accuracy when interacting with different EEPROM models.
The code is well-structured, robust, and includes built-in error handling to improve reliability. The main variables include DataBuff, which points to the memory buffer used for input and output; Length, indicating how many bytes are to be read or written; Addr, representing the internal address of the EEPROM; and Control, which defines the operation mode (read or write) as well as chip selection through bits A2, A1, and A0. The function returns a bit variable—0 for success and 1 for failure. Additionally, an error counter limits the number of retries before the operation is aborted.
The user can define SDA and SCL pins according to their hardware setup. For smaller EEPROMs like 1K, 2K, 4K, 8K, and 16K bits, an 8-bit address is used. For larger chips (32K bits and above), two 8-bit addresses are required. Page addressing is also supported for certain sizes, such as 4K, 8K, and 16K, enhancing the program’s compatibility across different EEPROM configurations.
This comprehensive program is ideal for developers working with I²C-based EEPROMs, offering a reliable and efficient solution for data storage and retrieval in embedded systems. Whether you're designing a simple sensor logging system or a more complex data management application, this code provides a solid foundation for working with AT24C256 and similar devices.
Complete program code
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