I2C Bit Injection Adds Memory Banks To Everything
[Igor] wished to upgrade his newly acquired radio — a Baofeng UV-82 — with a larger memory for storing additional scanning channels, and came up with a very elegant solution: Replacing it’s EEPROM with a larger one and injecting the additional memory address bits into the I2C data line.
The cheap handheld radio comes with an 8192 bytes large 24c64 EEPROM, which allows it to store 128 channels along with a few other persistent settings. The radio’s firmware sends two-byte memory addresses over the I2C bus when accessing the 24c64, but since the 24c64’s largest address is B00011111 11111111, these addresses always roll in with …read more
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