Although the topic is quite old I am interested to solve a similar problem for which will really appreciate your support / expertise.

On short, I am receiving serially 16 ASCII-Characters, say "3", "B", "5", "A", "7", "F","1", "D", "2", "2", "4", "F","E", "E", "A", "6".

Then I need to pack 2 digits in 1 Byte and write them to the EEPROM. The final result should be: 2B 5A 7F 1D 22 4F EE A6.
Any clue or tip with regard to algorithm or conversion formula will be highly appreciated. Have a happy and prosperous New Year !