首先将串口初始化,然后添加重定向代码
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下面使用的是串口三,因此以串口三为例:; A7 U; f+ a) J# q. I% {
' q ~$ f, [7 g; k: d- UART_HandleTypeDef huart3;
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- /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
* {7 q. s, @* D' `& |4 Y - set to 'Yes') calls __io_putchar() */9 c% D. ]! Z) m
- #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)$ _, E: z6 Y- j8 J Y# X7 ~
- #else# `! Q5 c: w {4 m
- #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)1 \( S/ S/ q* A$ _
- #endif /* __GNUC__ */7 R- o6 Q0 B9 W
- /**2 C3 t# g4 j) j. V9 ~( `7 G' a
- * @brief Retargets the C library printf function to the USART.$ e, a% V6 b6 m
- * @param None
% `2 L" I' R1 I" Z) [$ m- i- ~ - * @retval None
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- PUTCHAR_PROTOTYPE
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# c( Y8 d$ ?% X6 A - /* Place your implementation of fputc here */# Z/ f {5 f( w. z- T6 k; j; g$ T
- /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */0 i+ J' ?4 c! @1 z5 v
- HAL_UART_Transmit(&huart3, (uint8_t *)&ch, 1, 0x0001);/ I6 g5 t; ^% S+ ~: k/ `( q3 d
- return ch;
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复制代码 / g! p9 l6 z, O/ _* W/ w) ]
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添加完代码后就可以使用printf进行打印了~
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