1.创建好FreeRTOS代码,在User文件夹中添加printf-stdarg.c。并添加到工程中9 z) Q9 I3 Y9 h
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2.重定向printf到串口,在usart.c中添加代码5 H7 H. y+ \/ m, t6 F+ l2 w
; [0 }& A2 m) ^. }+ n* j- /* USER CODE BEGIN 0 */
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- #include <stdio.h>" ^" v# t* y- X% y" d
- #ifdef __GNUC__1 s7 X6 b/ v( w0 y, }+ z
- /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf: V# [7 p: B( W5 f! Z/ n
- set to 'Yes') calls __io_putchar() */6 w+ C8 D0 t2 w0 e" I
- #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)4 U/ d) M) r! j, M& x" {
- #else+ r$ e- N7 x) j3 b; e- t- c: g/ x
- #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)* `$ j+ Q% _3 E
- #endif /* __GNUC__ */) X4 @) p9 Y. M" o, V( f9 M
- ///**0 u6 D% P4 D; K* ~% m$ A
- // * @brief Retargets the C library printf function to the USART.) U) _& J6 V2 ~+ V+ [5 T9 a
- // * @param None
. B4 Z8 n, u n: U - // * @retval None
# v2 k# B4 U3 ~( d - // */+ R# H. C; _; }/ F
- PUTCHAR_PROTOTYPE' d- L) @# L) n8 C* Y8 w
- {
3 k5 ~, R6 `, W. H6 U: l - /* Place your implementation of fputc here */( Q9 D* u/ V% E0 P y- D+ A/ h0 A
- /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */* Y+ b. u, l- s; F% X; p _
- HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);; s& g1 t8 {8 j
, @' `0 U9 q K$ I/ P( S- return ch;9 o: n( e- \+ b5 T8 }9 R8 i+ E& @
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- /* USER CODE END 0 */
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8 ~; P \: N/ |9 F3.修改printf-stdarg.c
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$ o5 J8 [# F9 n9 z- /*
" g) W. ?& j3 i( Q Z$ P% h - #define putchar(c) c6 S2 t4 J( v9 o. {
- */3 t7 y1 {4 y4 n: O* r' c
7 B8 a; P8 ~% W- u' A6 p- static void printchar(char **str, int c)
4 D K# y7 F7 m$ e( n6 W - {
7 p, D/ T6 }* ` ` D. L4 B. c" { - extern int putchar(int c); //去掉原本的注释9 N. Y) u' Z" m' ]; P
-
: W1 w1 w, s; V+ h. e - if (str) {
: I6 R# k" ]6 p! {- ^9 g - **str = (char)c;
$ R2 @. _5 V. x2 w( d! p - ++(*str);) k2 p X9 ~, H
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- else' ?6 i [* @4 q* g
- {
: V$ e4 v( E- L% @ - (void)putchar(c);5 [, g( v6 q. s0 z" ^
- }
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复制代码- /*修改printf为f_printf。sprintf,snprintf也是一样修改*/
/ j) h: K* |/ [% ~7 Q7 k4 d4 y# B( [ - int f_printf(const char *format, ...)* Y( D( }' p" B1 ]( _) K0 ^: R
- {
& k% r6 ~) f$ \ - va_list args;
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- va_start( args, format );8 t6 F+ |1 A& q$ z8 J, ] p9 i
- return print( 0, format, args );
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- int f_sprintf(char *out, const char *format, ...), Z' f! w. r% F; r: S$ E
- {
+ t B, T. p7 A( l4 f& b+ @/ O- M$ v t - va_list args;9 n9 g/ K' x% b/ O' M! N0 b
0 d' d+ x2 ?# l5 P- O- va_start( args, format );
: V! M6 K$ \& {0 n - return print( &out, format, args );" D$ {3 @) L1 e, E
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}2 T% y, h0 G0 n; @( s- int f_snprintf( char *buf, unsigned int count, const char *format, ... )
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- va_list args;2 O* {, g3 w: Y9 e% r5 T
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- ( void ) count;
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- va_start( args, format );' N( _) W9 B* Y- x9 j
- return print( &buf, format, args );) f: M$ X, y. B* r0 E$ X& A
- }
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3 R& n# K" S- t+ h) Z4 V 4.修改main.c
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& U! V# C/ w2 X5 b9 j/ Z; E- #include <stdio.h>2 U: D. b8 |/ ]/ R ?
- extern int f_printf(const char *format, ...);* ` `: j: G9 v1 v* _' y' d8 O
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- *
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- int main(): P) w( f7 v s8 T0 c
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- /**/+ _' V* _ l+ v. A5 I- J" ]; t% ^. D
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- static void LED1_Task(void* pvPrameters)
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- while(1)
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- temp_count++;0 `& k- O8 \1 ~- T1 N
- HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_1); Y" b1 w/ Q( y! |% f3 U* \( H2 L
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- /*串口输出字符*/
; ?3 ], @, d0 Y' M - f_printf("LED1_TASK running."); . h. c) C0 e' M4 `/ I
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- vTaskDelay(1000);' e. P9 L6 F# N' Q/ H
- }
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