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README.md
STM8S103F keypad to UART
Matrix: row C3-6 x column D1-4
UART1 Tx: D5
Keypad format:
1 2 3 A
4 5 6 B
7 8 9 C
* 0 # D
Each keypress emits the corresponding ASCII to UART (ABCD uppercase). No repeat.
Only one key can be pressed at a time.