Hello! I have connected an UNO R3 to a circuit desribed in the NAMA MDB 4.2 standard so that I can "talk" to a vending machine. void init_MDB() { // Set baud rate UBRR0H = UBRRH_VALUE; UBRR0L = UBRRL_VALUE; // Disable USART rate doubler (arduino bootloader leaves it enabled...) UCSR0A &=…

MDB USART mystery

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