Enhance DEBUG_UART feature (used by printf) #162
Merged
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If the debug UART is not initialized by a Serial instance, init it at 9600 (8N1) by default.
Else use the config done by the Serial instance.
Those values could be redefined in the variant.h
DEBUG_UART could be redefined to print on another instance than 'Serial'
#define DEBUG_UART ((USART_TypeDef *) U(S)ARTX) // ex: USART3
DEBUG_UART baudrate, default: 9600 if not defined
#define DEBUG_UART_BAUDRATE 115200
DEBUG_UART Tx pin name, default: the first one found in PinMap_UART_TX for DEBUG_UART
#define DEBUG_PINNAME_TX PX_n // PinName used for TX