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:
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% J! L6 q/ R5 Y4 F0 ~- UART_HandleTypeDef huart3;- y2 N% [2 Z, O, N
- #ifdef __GNUC__5 E/ J5 D& _/ {" T$ S% ?
- /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
8 H- \8 }/ H a - set to 'Yes') calls __io_putchar() */% y$ L' Z* E6 k8 d; P
- #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)1 d% O$ Q3 g0 j4 J# M2 k
- #else
0 f" U+ ^9 q# z/ ] - #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
. S( A5 n" o9 e, Q& n - #endif /* __GNUC__ */
8 ]+ R4 p( W4 Y- w9 ^: X! Q+ }. I - /**- l7 b+ u. L! X( [
- * @brief Retargets the C library printf function to the USART." L3 |; i) c; Y6 p- a' ~5 C1 y0 H
- * @param None9 j1 m6 w) ?7 Q, j3 H! q" T
- * @retval None
/ o# G6 I( Y' H - */
! J: K, s+ u# O% B - PUTCHAR_PROTOTYPE+ V( z' q' \% [
- {
- F: a. \ }2 H { - /* Place your implementation of fputc here */! y% V+ C7 Y% P( ]( |' y
- /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */& `4 O( L, H- m
- HAL_UART_Transmit(&huart3, (uint8_t *)&ch, 1, 0x0001);
8 I' {2 ?1 o& D+ O - return ch;
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复制代码 $ o2 ?! `9 @/ a2 ^3 i/ L$ j
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添加完代码后就可以使用printf进行打印了~. k* z- b1 }' H" W" Z7 }6 t
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