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    using printf for two usart in stm32

    hi I'm using stm32 by keil5 compiler and This is my printf function #ifdef __GNUC__ /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf set to 'Yes') calls __io_putchar() */ #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #define GETCHAR_PROTOTYPE int...

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