F7 serial port sending problem---application of printf function

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F7 serial port sending problem---application of printf function [Copy link]

When compiling the F7 program with MDK, I found that the printf() function that can be used after redefining the C function on F103 cannot be used in F7. I spent a whole morning to solve the problem of sending the printf() function. Finally, I solved it. Direct solution#ifdef __GUNC__ #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #else #define PUTCHAR_PROTOTYPE int fputc(int ch,FILE *f) #endif PUTCHAR_PROTOTYPE { HAL_UART_Transmit(&uart1Handel, (uint8_t*)&ch, 1, 0xffff); return ch; } Add this function in the main function and you can use printf(“\r\n ************ \r\n ”) function directly! ! !

huaiqiao

Wouldn't it be nice if you could explain the difference between the printf functions in F103 and in F7?

bobde163

I don't see how to solve it. Both require redirecting the fput function. What's the difference?