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