# d  C4 B; z6 g

模仿kfifo实现的环形缓冲区

% R+ w: e* _9 u2 M" d6 a
转载来源：模仿kfifo实现的环形缓冲区


+ P& }" d5 H  [GitHub仓库：http://github.com/XinLiGitHub/RingBuffer
7 l" D4 T7 h6 S6 ?- RPS：博文不再更新，后续更新会在GitHub仓库进行。

" ?8 g; s& t8 B6 A8 s8 B    模仿kfifo实现的环形缓冲区。程序中涉及到环形缓冲区的概念，详细介绍见维基百科[Circular buffer](http://en.wikipedia.org/wiki/Circular_buffer)。

1，开发环境
) @/ y& _4 e/ V; C      1，操作系统：Windows 10 专业版
- g) N5 U! O: w1 [      2，IDE：Visual Studio 2015 专业版
) A2 p, w' G( L- @
, d; z0 k$ C3 |2，程序源码
      RingBuffer.h文件

1. /**
   
2.   ******************************************************************************
   
3.   * @file    RingBuffer.h
   7 c2 w4 b; H' l5 V% i' t# O
4.   * @author  XinLi
   2 O# v/ r/ b7 x/ r% f8 Z/ J0 S
5.   * @version v1.0
   
6.   * @date    15-January-2018
   
7.   * @brief   Header file for RingBuffer.c module.
   
8.   ******************************************************************************
   
9.   * @attention
   9 N; [/ Q% G5 c9 ?1 ?& p# Y; H* j7 N
10.   *
    
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    
12.   *
    $ n5 m, f6 c7 P# ]2 u0 K# p6 c( e
13.   * This program is free software: you can redistribute it and/or modify
    : k+ w$ w& \. Y: _" T+ h5 M& m0 l
14.   * it under the terms of the GNU General Public License as published by
    1 Y+ S* e7 z( H( i; l
15.   * the Free Software Foundation, either version 3 of the License, or
    , m6 v4 {+ y7 p1 G: K) b! q
16.   * (at your option) any later version.
    3 g9 c0 ^4 s6 D: ?+ a. L: n
17.   *
    2 j: P, ]% m4 {/ Z. T  t: n
18.   * This program is distributed in the hope that it will be useful,
    
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    % s6 G1 d- ?7 f) E* O% f* w
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
21.   * GNU General Public License for more details.
    ' _% D3 d6 u( j8 w1 ^
22.   *
    
23.   * You should have received a copy of the GNU General Public License
    
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
25.   *
    6 A; ^3 k: @/ f) o- I+ j
26.   ******************************************************************************
    0 z; w( l2 a; N( z
27.   */
    
28. 
    . z+ Z; M% k. d9 j
29. #ifndef __RINGBUFFER_H
    - G. F: r2 |/ @& I
30. #define __RINGBUFFER_H
    & J) @& L8 V5 t. _6 a
31. 
    5 C" e+ ?* h, j- R4 j. L) A
32. #ifdef __cplusplus
    " b. T( Y; `" Y
33. extern "C" {
    
34. #endif
    6 D. u) Q- R" y6 h- t
35. 
    
36. /* Header includes -----------------------------------------------------------*/
    
37. #include <stdint.h>
    
38. #include <stdbool.h>
    
39. 
    
40. /* Macro definitions ---------------------------------------------------------*/
    ( V. G% }1 L. s2 \* I. K
41. #define RING_BUFFER_MALLOC(size)  malloc(size)
    % v8 w8 d2 J) w. M, Z) X
42. #define RING_BUFFER_FREE(block)   free(block)
    
43. 
    ( x  [+ x1 n# r% a8 E
44. /* Type definitions ----------------------------------------------------------*/
    
45. typedef struct
    
46. {
    
47.   uint8_t *buffer;
    
48.   uint32_t size;
    
49.   uint32_t in;
    
50.   uint32_t out;
    1 }, Q2 Z& B% q$ q% q
51. }RingBuffer;
    2 ?  b' u' D* f
52. 
    7 ?- E8 g- p8 p/ L0 O, i
53. /* Variable declarations -----------------------------------------------------*/
    - }2 d8 J( q% j% Z( W6 F# s. e) a
54. /* Variable definitions ------------------------------------------------------*/
    
55. /* Function declarations -----------------------------------------------------*/
    
56. RingBuffer *RingBuffer_Malloc(uint32_t size);
    + O5 e3 @; W" t! A3 C( W7 T
57. void RingBuffer_Free(RingBuffer *fifo);
    
58. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len);
    , @- m/ D' R7 o- O
59. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len);
    
60. 
    
61. /* Function definitions ------------------------------------------------------*/
    
62. 
    
63. /**
    6 @/ F1 l+ W  r1 I
64.   * @brief  Removes the entire FIFO contents.
    
65.   * @param  [in] fifo: The fifo to be emptied.
    
66.   * @return None.
    # B6 b7 n3 J# c$ X& Z
67.   */
    7 }# _( S( ~, H0 n# }+ Y
68. static inline void RingBuffer_Reset(RingBuffer *fifo)
    
69. {
    
70.   fifo->in = fifo->out = 0;
    2 R& g  m) }+ q9 p6 \6 D
71. }
    6 y- z1 j7 Z' m" `8 S
72. 
    
73. /**
    
74.   * @brief  Returns the size of the FIFO in bytes.
    
75.   * @param  [in] fifo: The fifo to be used.
    2 h8 p* n/ J2 g4 }4 C% v! Q4 n2 d
76.   * @return The size of the FIFO.
    - ?! R: r6 h% T  g  L4 N+ d
77.   */
    % _: |! X0 e" N) A
78. static inline uint32_t RingBuffer_Size(RingBuffer *fifo)
    
79. {
    
80.   return fifo->size;
    
81. }
      p/ n" `1 l# O: R
82. 
    / g5 Q* O  a; K$ c5 d8 g9 M% L! t
83. /**
    $ h4 N9 o4 e: P1 T
84.   * @brief  Returns the number of used bytes in the FIFO.
    2 t+ X" R5 s( L
85.   * @param  [in] fifo: The fifo to be used.
    
86.   * @return The number of used bytes.
    ( w" B# Q' ?: E1 t
87.   */
    % V: h* R9 s; i( {2 W
88. static inline uint32_t RingBuffer_Len(RingBuffer *fifo)
    % L$ b) d* X# ]& K
89. {
    6 y4 c9 W& m, |8 [0 T
90.   return fifo->in - fifo->out;
    9 @/ A# M* _2 A, A, V
91. }
    , ~0 b& _. _5 c' r
92. 
    
93. /**
    9 p- C2 x5 w7 }8 l1 I8 @
94.   * @brief  Returns the number of bytes available in the FIFO.
    
95.   * @param  [in] fifo: The fifo to be used.
    + c# b2 i6 Z! x7 r' W  p
96.   * @return The number of bytes available.
    ' u& G1 V6 e; q  @5 K* i. W
97.   */
    
98. static inline uint32_t RingBuffer_Avail(RingBuffer *fifo)
    
99. {
    " O6 w5 Z7 D* [! h
100.   return RingBuffer_Size(fifo) - RingBuffer_Len(fifo);
     
101. }
     / v7 \; Z; z' Q; T3 K: l  v# `
102. 
     7 i& T# A; m- L& {: [3 C
103. /**
     
104.   * @brief  Is the FIFO empty?
     
105.   * @param  [in] fifo: The fifo to be used.
     
106.   * @retval true:      Yes.
     9 A: o( R9 k& g8 s; p
107.   * @retval false:     No.
     
108.   */
     
109. static inline bool RingBuffer_IsEmpty(RingBuffer *fifo)
     
110. {
     
111.   return RingBuffer_Len(fifo) == 0;
     8 u/ E& q' Z+ {9 k' A( d
112. }
     
113. 
     6 w- N" n9 ?; n) m6 C; H
114. /**
     
115.   * @brief  Is the FIFO full?
     
116.   * @param  [in] fifo: The fifo to be used.
     
117.   * @retval true:      Yes.
     8 ^6 e; U0 |3 A; a& i  t% A
118.   * @retval false:     No.
     " ^# M% S1 a$ P) L1 i
119.   */
     $ P, G: {0 V' ?+ S  X' e6 g
120. static inline bool RingBuffer_IsFull(RingBuffer *fifo)
     8 _9 z; e) r$ l* ~2 X. t: u
121. {
     
122.   return RingBuffer_Avail(fifo) == 0;
     
123. }
     
124. 
     
125. #ifdef __cplusplus
     9 q% p; [% B7 x& k- H1 e3 f5 x7 ~0 `
126. }
     8 o$ Y" d' j( O  ^& X- Q6 j# l. E, v3 p
127. #endif
     
128. 
     9 O' d- @1 V8 C4 E* H
129. #endif /* __RINGBUFFER_H */
     

复制代码

7 q" n7 m4 B, \' ?      RingBuffer.c文件
+ _: D- E7 v7 w0 D2 Z

1. /**
   
2.   ******************************************************************************
   . I; P' C, @( v1 L
3.   * @file    RingBuffer.c
   0 h. B, P  ?( q8 z' Z3 F# k
4.   * @author  XinLi
   * v9 J  V- l5 D% T& \, o
5.   * @version v1.0
   
6.   * @date    15-January-2018
   
7.   * @brief   Ring buffer module source file.
   ! ^( W' _+ Y: F' D5 d6 l
8.   ******************************************************************************
   # @5 W# w/ h! b  [, D
9.   * @attention
   
10.   *
    3 {: Z4 b% R0 C2 g  ?' b2 @
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    3 T% q3 R# w3 l+ m# ~6 K
12.   *
    " o) Z# s  j; \1 h7 \- A
13.   * This program is free software: you can redistribute it and/or modify
    5 @9 |5 h* @" D5 M( j; i
14.   * it under the terms of the GNU General Public License as published by
    ; j; [: l8 t, C5 B8 m% t2 c/ m
15.   * the Free Software Foundation, either version 3 of the License, or
    5 n/ c6 |1 V/ W5 J
16.   * (at your option) any later version.
    * A3 w+ a4 [0 ~/ @
17.   *
    
18.   * This program is distributed in the hope that it will be useful,
    
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    ) u% b$ E* \) u9 l5 E% _6 l2 u' z
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
21.   * GNU General Public License for more details.
    
22.   *
    " S; X( L* D: b$ e( |
23.   * You should have received a copy of the GNU General Public License
    
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
25.   *
    ! S8 ~1 [/ x; n9 l9 i
26.   ******************************************************************************
    % i, g5 t8 W+ i9 R% g7 X, s2 d$ s6 e
27.   */
    5 W- B' O( n& q: y% B5 h& c6 N
28. 
    3 E' _9 d; H: H; C1 }& _
29. /* Header includes -----------------------------------------------------------*/
    ) T# ?) ?0 m" L8 F% x
30. #include "RingBuffer.h"
    ) q# L& L# j' E3 ^% G
31. #include <stdlib.h>
    & ^* x0 |9 N  f$ B  W* h, K6 ]
32. #include <string.h>
    
33. 
    4 O" t, [: z" C
34. /* Macro definitions ---------------------------------------------------------*/
    
35. /* Type definitions ----------------------------------------------------------*/
    & p. c( L, B# L& ~: b
36. /* Variable declarations -----------------------------------------------------*/
    ) D, Q4 M* t2 T' D; c
37. /* Variable definitions ------------------------------------------------------*/
    ! x( l1 H3 L# o
38. /* Function declarations -----------------------------------------------------*/
    
39. static bool is_power_of_2(uint32_t x);
    / r: d7 ~- V* t1 w' [- j& d3 m
40. static uint32_t roundup_pow_of_two(uint32_t x);
    / @6 J! _0 q$ S# c! ^& U! F
41. 
    
42. /* Function definitions ------------------------------------------------------*/
      t, J1 ^/ I5 X- f& k. i* B7 C
43. 
    # H9 j; j) Y/ E8 @5 v3 Q3 q
44. /**
    5 g' j  C- j3 S' `
45.   * @brief  Allocates a new FIFO and its internal buffer.
    
46.   * @param  [in] size: The size of the internal buffer to be allocated.
    5 @3 D) }$ l# R5 |3 ^  `
47.   * @note   The size will be rounded-up to a power of 2.
    ) R/ p% F0 [: ?' O$ R- b
48.   * @return RingBuffer pointer.
    
49.   */
    + d, b2 o* Q8 K2 R
50. RingBuffer *RingBuffer_Malloc(uint32_t size)
    
51. {
    
52.   RingBuffer *fifo = RING_BUFFER_MALLOC(sizeof(RingBuffer));
    4 v8 m8 p& t( X" y8 }
53. 
    
54.   if(fifo != NULL)
    - x5 E9 _5 c& R6 }! g, `& w
55.   {
    
56.     if(is_power_of_2(size) != true)
      o5 R/ T! u: s( }
57.     {
    
58.       if(size > 0x80000000UL)
    0 r7 Z7 s' A1 l2 ]' P
59.       {
      [1 y+ \8 _( @1 r- N$ O
60.         RING_BUFFER_FREE(fifo);
    1 e0 J3 M! W3 V: A: z" N
61.         fifo = NULL;
    
62.         return fifo;
    
63.       }
    6 d& H2 ^% Q+ i7 L4 f3 P
64. 
    
65.       size = roundup_pow_of_two(size);
    
66.     }
    
67. 
    6 T! ?0 \& f3 E7 {" ~
68.     fifo->size   = size;
    9 j( m2 Q( ~# [( V; {- r
69.     fifo->in     = 0;
    0 N& r3 v8 ~2 `3 ]
70.     fifo->out    = 0;
    5 @6 ^+ }. L* [
71.     fifo->buffer = RING_BUFFER_MALLOC(fifo->size);
    3 f8 m4 ]% J) K: M  n9 e
72. 
    0 o0 a% O$ v  O9 m9 }9 J. z
73.     if(fifo->buffer == NULL)
    - v/ L- ?4 |3 D6 ^2 @
74.     {
    ; Q8 u; Q8 l8 b- K0 _
75.       RING_BUFFER_FREE(fifo);
    1 }! E9 B: ~) }+ t! {) v6 `
76.       fifo = NULL;
    
77.       return fifo;
    
78.     }
    ! x& f2 U4 w$ ^  \# k5 d, ?
79.   }
    
80. 
    # o) I0 V8 ^  h
81.   return fifo;
    4 J' M0 K7 Z0 Y1 V
82. }
    % q  v' G; E: O9 r9 U! b; ~+ Y( u
83. 
    + v- ?5 _$ m7 F, P  V: e' h
84. /**
    , Z: M& ]$ U: x  F% {
85.   * @brief  Frees the FIFO.
    6 L1 Z8 n: t1 Z5 H' [, v5 S
86.   * @param  [in] fifo: The fifo to be freed.
    . _7 N0 O6 r! \# b
87.   * @return None.
    0 F: Q  P8 V3 d# Y4 D; G; E6 f
88.   */
    
89. void RingBuffer_Free(RingBuffer *fifo)
    
90. {
    $ u9 Y- m3 M9 y  E7 L3 {2 F
91.   RING_BUFFER_FREE(fifo->buffer);
    
92.   RING_BUFFER_FREE(fifo);
    
93.   fifo = NULL;
    
94. }
    
95. 
    ! s% }6 r6 V6 t+ K+ i
96. /**
    
97.   * @brief  Puts some data into the FIFO.
    6 i4 v( _1 k1 ~+ I( d) d# Y. |
98.   * @param  [in] fifo: The fifo to be used.
    + y. _7 o0 e% J& M% w+ f
99.   * @param  [in] in:   The data to be added.
    - f- A, c7 s1 S& a, L) o
100.   * @param  [in] len:  The length of the data to be added.
     4 Z. Q+ j7 s7 [2 {5 l% n; ]/ Z# R
101.   * @return The number of bytes copied.
     
102.   * @note   This function copies at most @len bytes from the @in into
     
103.   *         the FIFO depending on the free space, and returns the number
     1 ]& p! X3 V9 b" {7 G
104.   *         of bytes copied.
     4 W# n/ T1 e+ t
105.   */
     
106. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len)
     " n% v9 Q: w* {% s
107. {
     $ v. @& X! y# h$ t
108.   len = min(len, RingBuffer_Avail(fifo));
     
109. 
     4 c# y4 [# N$ ^  A. X% k
110.   /* First put the data starting from fifo->in to buffer end. */
     2 k* B# l' S  o* N4 }' E
111.   uint32_t l = min(len, fifo->size - (fifo->in & (fifo->size - 1)));
     ; l5 b  T% n2 V$ o9 `; d
112.   memcpy(fifo->buffer + (fifo->in & (fifo->size - 1)), in, l);
     
113. 
     
114.   /* Then put the rest (if any) at the beginning of the buffer. */
     
115.   memcpy(fifo->buffer, (uint8_t *)in + l, len - l);
     4 m. k7 y2 @7 B; t& j$ ]% R
116. 
     5 O% ~, \+ l1 r
117.   fifo->in += len;
     
118. 
     
119.   return len;
     
120. }
     # T4 Q9 ]+ U8 j! y- A/ Z3 k" _1 a
121. 
     
122. /**
     
123.   * @brief  Gets some data from the FIFO.
     
124.   * @param  [in] fifo: The fifo to be used.
     $ z- y) q" Z% a
125.   * @param  [in] out:  Where the data must be copied.
     
126.   * @param  [in] len:  The size of the destination buffer.
     
127.   * @return The number of copied bytes.
     : N' S- t& ?/ o& k
128.   * @note   This function copies at most @len bytes from the FIFO into
     ) \3 L: Q/ w1 E- c7 ?' t
129.   *         the @out and returns the number of copied bytes.
     
130.   */
     
131. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len)
     
132. {
     & j7 @4 e' Q4 B" ~, h, a3 m  u5 v
133.   len = min(len, RingBuffer_Len(fifo));
     . e, u6 O% g* |( V2 C' X' u
134. 
     
135.   /* First get the data from fifo->out until the end of the buffer. */
     
136.   uint32_t l = min(len, fifo->size - (fifo->out & (fifo->size - 1)));
     
137.   memcpy(out, fifo->buffer + (fifo->out & (fifo->size - 1)), l);
     
138. 
     ! V; o8 h! s; t2 d; e. j
139.   /* Then get the rest (if any) from the beginning of the buffer. */
     - T6 Q+ K. c0 D# p: C
140.   memcpy((uint8_t *)out + l, fifo->buffer, len - l);
     / ~) E6 M, u6 U/ K% J6 \
141. 
     
142.   fifo->out += len;
     
143. 
     
144.   return len;
     # U5 N  C7 a  m; P9 W9 F
145. }
     
146. 
     ; W$ c+ x( I: o& ]
147. /**
       r2 @# Q$ `; C, N
148.   * @brief  Determine whether some value is a power of two.
     
149.   * @param  [in] x: The number to be confirmed.
     & v& [5 d+ k& n/ y
150.   * @retval true:   Yes.
       \- v. H; R4 O8 i
151.   * @retval false:  No.
     
152.   * @note   Where zero is not considered a power of two.
     
153.   */
     # k2 @0 v5 ?1 K
154. static bool is_power_of_2(uint32_t x)
     4 Q$ M9 p" e( U  r' C( w. d
155. {
     
156.   return (x != 0) && ((x & (x - 1)) == 0);
     
157. }
     
158. 
     6 r2 c6 r  m$ q7 i+ f
159. /**
     
160.   * @brief  Round the given value up to nearest power of two.
     
161.   * @param  [in] x: The number to be converted.
     
162.   * @return The power of two.
     
163.   */
     
164. static uint32_t roundup_pow_of_two(uint32_t x)
     
165. {
     , I" _; `8 m$ D; {. ?
166.   uint32_t b = 0;
     
167. 
     , `: x' U5 X; P
168.   for(int i = 0; i < 32; i++)
     8 d3 u1 E* s" N1 e" o. v9 a) ~
169.   {
     
170.     b = 1UL << i;
     # a  Z$ O1 C1 D, x
171. 
     
172.     if(x <= b)
     
173.     {
     
174.       break;
     
175.     }
     
176.   }
     
177. 
     
178.   return b;
     8 F) T- y# z- T0 J* E
179. }
     

复制代码

- h0 p1 @% H9 ^8 h- T% Q      main.c文件

1. /**
   
2.   ******************************************************************************
   . j: E. F5 k( L3 B' T; P
3.   * @file    main.c
   : L3 P3 _7 L$ @- w/ L$ Q( w9 v0 `
4.   * @author  XinLi
   
5.   * @version v1.0
   . Y1 _( E$ y9 ?6 X) [# b& z
6.   * @date    15-January-2018
   
7.   * @brief   Main program body.
   ) b! S1 R3 V5 p8 g! H4 j
8.   ******************************************************************************
   " S1 I. J* }# V, C3 |$ s
9.   * @attention
   
10.   *
    2 e( \: h0 }3 t/ r" H/ m* g* r
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    $ I7 S; p: c9 V: T
12.   *
    3 Q, v6 s5 a9 x/ u; J1 D
13.   * This program is free software: you can redistribute it and/or modify
    
14.   * it under the terms of the GNU General Public License as published by
    ( ?- j: L1 }* r( o, M, p
15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    9 G6 s) Q- q8 M. W( V2 Y7 r( `% W
17.   *
    
18.   * This program is distributed in the hope that it will be useful,
    # P1 |- {8 [7 g9 M" @
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    % @1 S0 a& {$ E* J/ y/ A
21.   * GNU General Public License for more details.
    
22.   *
    
23.   * You should have received a copy of the GNU General Public License
    
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
25.   *
    
26.   ******************************************************************************
    
27.   */
    
28. 
    + m  A/ q+ `7 O5 h6 m% q+ n
29. /* Header includes -----------------------------------------------------------*/
    
30. #include "RingBuffer.h"
    2 D0 I/ I. l: b5 L' N
31. #include <stdio.h>
    + ~. ^( p6 W- l2 D/ J6 t
32. #include <windows.h>
    5 V( _/ a3 p* Q7 x$ d
33. 
    
34. /* Macro definitions ---------------------------------------------------------*/
    
35. /* Type definitions ----------------------------------------------------------*/
    1 O! P- Q4 t' D+ @
36. /* Variable declarations -----------------------------------------------------*/
    5 U$ ^& C4 `. _/ Y( x7 m( T
37. /* Variable definitions ------------------------------------------------------*/
    
38. /* Function declarations -----------------------------------------------------*/
    + v, T: S* n! \& s* g
39. /* Function definitions ------------------------------------------------------*/
    5 p! h$ k/ T% ^/ t  g. l
40. 
    
41. /**
    5 L9 ?5 w! p* g' Z& ?
42.   * @brief  Main program.
    . x. b- g( c! q7 e4 T' t
43.   * @param  None.
    
44.   * @return None.
    
45.   */
    
46. int main(void)
    
47. {
    
48.   uint8_t data[256] = {0};
    - `$ Z% a7 d1 q4 I
49. 
    3 G$ [) v7 h7 k; m6 a$ ?
50.   for(int i = 0; i < sizeof(data); i++)
    
51.   {
    
52.     data[i] = i;
    2 E7 _/ ^$ l1 l3 A# z: D# m
53.   }
    . J( N" x1 u% E+ j; \( J
54. 
    5 O( W# p' y  q( s! ~
55.   RingBuffer *fifo = RingBuffer_Malloc(sizeof(data));
    8 @. N! m) c6 H5 M$ J& h* z
56. 
    
57.   if(fifo != NULL)
    
58.   {
    
59.     printf("FIFO创建成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    
60.            RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    
61. 
    + {' r& |. M0 q5 h- A0 ?. c  V
62.     if(RingBuffer_IsFull(fifo) == true)
    ) V8 _$ R! i8 n- `& X
63.     {
    ( Q% \1 F, b( v8 r: q3 C( R
64.       printf("FIFO满了！！！\n");
    4 ?! ?+ t. k8 a  b' ~: P# L) Z
65.     }
    
66.     else
    
67.     {
    2 b* S3 d3 B7 D; j* l* c; N
68.       printf("FIFO没满！！！\n");
    
69.     }
    & k# ]; v- ?# i) v, D: t" w
70. 
    4 @* N4 U; N2 x1 U+ F: O
71.     if(RingBuffer_IsEmpty(fifo) == true)
    
72.     {
    
73.       printf("FIFO空了！！！\n");
    
74.     }
    
75.     else
    
76.     {
    0 L5 @2 q3 V" X; y
77.       printf("FIFO没空！！！\n");
    
78.     }
    
79. 
    ) ^6 s7 T9 |$ a/ }. b
80.     printf("\n");
    6 Q$ a  h" T! J; _! R9 F  w. a
81. 
    " J& W7 ~8 _2 Y8 M  w( s& p9 j
82.     for(;;)
    
83.     {
    
84.       {
    
85.         if(RingBuffer_In(fifo, data, sizeof(data) / 2) > 0)
    
86.         {
    
87.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    $ X2 y: I) k8 b( L9 A4 y
88.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    
89.         }
    
90.         else
    
91.         {
    , n4 C' \) C; X) m" Y3 {8 B
92.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    
93.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    3 ^+ k% b3 l8 g1 [9 |  q
94.         }
    
95. 
    
96.         if(RingBuffer_IsFull(fifo) == true)
    
97.         {
    ( Y0 ]& z% \0 x  g. y
98.           printf("FIFO满了！！！\n");
    
99.         }
    
100.         else
     # P; A, O) L- ?
101.         {
     
102.           printf("FIFO没满！！！\n");
     
103.         }
     ' ~9 @, }+ ~$ Y$ A" i+ P" P' _& v
104. 
     6 O0 R0 Z& k( k0 m9 C( j) e6 `
105.         if(RingBuffer_IsEmpty(fifo) == true)
     + T) I* T9 q2 \+ ?" u* _1 m# d" H
106.         {
     
107.           printf("FIFO空了！！！\n");
     
108.         }
     $ q' m9 X% h" I0 ]2 w6 @4 Z% Y- f) N
109.         else
     3 L3 s3 B% ^% P! ]
110.         {
     
111.           printf("FIFO没空！！！\n");
     
112.         }
     
113.       }
       [( B& A+ b1 M9 w
114. 
     ! q, X8 t. H2 ^) Q7 k
115.       printf("\n");
     
116. 
     
117.       {
     2 C: P) S: h/ F3 [# o
118.         uint8_t rdata[64] = {0};
     
119.         uint8_t len       = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     2 R1 D7 y5 |4 l5 v0 B  o8 l
120. 
     
121.         if(len > 0)
     
122.         {
       Y5 n1 e7 n. X+ Y7 q8 }
123.           printf("从FIFO中读出的数据，长度：%d\n", len);
     , M$ p, q& G/ u2 J
124. 
     0 k# E8 [& {  q9 h0 I( ]4 z0 [
125.           for(int i = 0; i < len; i++)
     3 f, |- N$ `( P5 k; D* u, h
126.           {
     3 z. _" `9 {# B+ ^& t7 K
127.             printf("%d ", rdata[i]);
     ( }6 n- Q, Z+ m% h( L& X4 I& v
128.           }
     ; o& Q( Y% C* h8 E4 R
129. 
     % U) P) D$ G6 a/ y
130.           printf("\n");
     6 z! D+ h  I+ P6 C
131. 
     - e/ r' B& W) Y6 g) \6 m! Z
132.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
133.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
134.         }
     + {  y2 R5 g8 J! y
135.         else
     
136.         {
     
137.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
138.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     $ J1 ]* }* y- [8 J! n
139.         }
     
140. 
     
141.         if(RingBuffer_IsFull(fifo) == true)
     / [- K6 X; v8 I% d
142.         {
     & z: `, M0 I' Z3 j
143.           printf("FIFO满了！！！\n");
     
144.         }
     * s. X. D9 a, d3 l
145.         else
     
146.         {
     
147.           printf("FIFO没满！！！\n");
     
148.         }
     ! D1 v( `1 ^8 d. G" w3 M
149. 
     " E0 o9 S+ _/ T# F2 Q) d# q
150.         if(RingBuffer_IsEmpty(fifo) == true)
     
151.         {
     
152.           printf("FIFO空了！！！\n");
     
153.         }
     / i: V9 g3 ]! }0 d( _% p
154.         else
     
155.         {
     * j0 Z& R" c, c
156.           printf("FIFO没空！！！\n");
     4 j2 O# |5 i+ g: _, W  F+ ^$ l: \
157.         }
     4 ~9 Z- Y+ n$ M6 W
158.       }
     
159. 
     
160.       printf("\n");
     6 J, F7 S, ~; V: ]/ c% X8 _
161. 
     # Z( a% [2 g8 S: c
162.       {
     & f: ]8 F# K) |3 O
163.         RingBuffer_Reset(fifo);
     * r/ ]' D/ }4 E2 X0 Z" {
164.         printf("FIFO清空成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
165.                RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
166. 
     , U4 {: U1 [0 v8 p! D& t+ {
167.         if(RingBuffer_IsFull(fifo) == true)
     4 r2 `, E; I4 d- D+ K+ V
168.         {
     : a0 }, p4 o# ~  _
169.           printf("FIFO满了！！！\n");
     
170.         }
     
171.         else
     
172.         {
     . L# a! y9 t' A5 P
173.           printf("FIFO没满！！！\n");
     
174.         }
     - C# O3 [9 r) z3 A8 }) U9 [4 c) e0 \: I
175. 
     3 j. I( _. b5 u1 I% ]
176.         if(RingBuffer_IsEmpty(fifo) == true)
     * Z; J! M6 T7 c* W- W
177.         {
     
178.           printf("FIFO空了！！！\n");
     ( V' u5 ~2 b2 p" n1 ^. g- L- P
179.         }
     
180.         else
     
181.         {
     
182.           printf("FIFO没空！！！\n");
     0 n7 }3 i& q( O* l7 w* w. @
183.         }
     " r  Y8 B6 Q- v
184.       }
     6 F1 t8 u+ C  Y0 u1 N; u
185. 
     
186.       printf("\n");
     
187. 
     , e7 B  i* X# ?- x, V
188.       {
     
189.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     ( `- t" d7 m% B3 |1 r1 d0 l; O& J" k
190.         {
     ' \% j! D: i7 Q- ^% e: D
191.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
192.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     9 `1 @: b/ y. H( P3 a
193.         }
     
194.         else
       i6 l, x2 e8 o( ^, d8 {
195.         {
     
196.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
197.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     # h4 y# J9 a9 S$ @8 ~
198.         }
     
199. 
     
200.         if(RingBuffer_IsFull(fifo) == true)
     / H! K5 c+ Z7 _5 C/ P  ^: c
201.         {
     & m$ l7 e7 z/ v
202.           printf("FIFO满了！！！\n");
     
203.         }
     1 ^, J& P- f* K' I+ H
204.         else
     
205.         {
     
206.           printf("FIFO没满！！！\n");
     1 j' |  T9 w2 H; v2 f, ]/ _
207.         }
     
208. 
     
209.         if(RingBuffer_IsEmpty(fifo) == true)
     
210.         {
     / N% W8 n4 t% T) D
211.           printf("FIFO空了！！！\n");
     , |' M5 v; R2 y. F& B! b- e, c5 T5 M- a
212.         }
     % A& d9 M9 l- x$ J* |9 e. J
213.         else
     9 O& }6 {& L- e) G7 m( a* c. J
214.         {
     % L! W* J2 X- x% |
215.           printf("FIFO没空！！！\n");
     ( F* Z  |- F2 O* q8 T( ?
216.         }
     3 f* M- A. r" B. O6 `
217.       }
     + N) Z# h0 b) a) a8 J4 q' E
218. 
     
219.       printf("\n");
     
220. 
     4 Y& F2 ?2 Z. [  l3 y4 y
221.       {
     
222.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
       w0 y$ R" e2 ?4 `
223.         {
     ( f( n4 R, Y! E
224.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
225.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
226.         }
     # S$ o  [$ o+ J1 m- ~( D
227.         else
     
228.         {
     
229.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     " L0 i% G8 e% P  o
230.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     . z; I8 M- l2 \  ]* y$ w
231.         }
     / o! b0 z8 V$ V+ L0 ?8 `3 w
232. 
     $ U( \8 E2 a7 x+ C$ P+ z
233.         if(RingBuffer_IsFull(fifo) == true)
     
234.         {
     2 g4 F- k- T0 T* f9 F2 ~! |$ ]
235.           printf("FIFO满了！！！\n");
     : \+ e8 K2 E4 p3 Q
236.         }
     
237.         else
     
238.         {
     - ]0 I3 t2 _8 H
239.           printf("FIFO没满！！！\n");
     ' K: G! A" N6 e
240.         }
     
241. 
     
242.         if(RingBuffer_IsEmpty(fifo) == true)
     
243.         {
     
244.           printf("FIFO空了！！！\n");
     
245.         }
     8 p% E- _% }! \& w8 s4 M5 d7 {2 I6 l
246.         else
     5 m! j- M4 m! P" z& ~
247.         {
     
248.           printf("FIFO没空！！！\n");
     & K' N8 w. F) ^# C
249.         }
     ) p1 u' J2 C) D3 i/ f4 t
250.       }
     
251. 
     & T! N6 v8 ^1 b. C% Z4 Z
252.       printf("\n");
     . y* S9 w6 |7 v7 M, V- q& v
253. 
     
254.       {
     1 R$ T, h/ `2 P8 u- Z
255.         uint8_t  rdata[256] = {0};
     
256.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     1 `" k/ m2 j+ o
257. 
     ! {. d9 ~* J. ^7 @3 [: f/ p: L
258.         if(len > 0)
     6 X4 B9 H5 C6 V5 q& J9 u
259.         {
     / m3 N- |/ F( l! S4 \3 r
260.           printf("从FIFO中读出的数据，长度：%d\n", len);
     ( G4 R3 B' J! L: l
261. 
     
262.           for(int i = 0; i < len; i++)
     
263.           {
     
264.             printf("%d ", rdata[i]);
     ! ]9 {( `4 r# s$ N, h' L4 J
265.           }
     $ w# h7 f+ S$ ^9 e. d* A
266. 
     
267.           printf("\n");
     
268. 
     # S- J+ l3 t( c$ G. y6 c9 j% `! N
269.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
270.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     . ~8 c) X! h1 P% L% {
271.         }
       ^" u* ]6 t$ U$ h# B2 V
272.         else
     ( c. i: V9 u4 {2 ]: O' e) p3 J
273.         {
     
274.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     ) D" w: S3 K1 b
275.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
276.         }
     
277. 
     
278.         if(RingBuffer_IsFull(fifo) == true)
     
279.         {
     
280.           printf("FIFO满了！！！\n");
     
281.         }
     5 }( G! ]+ N7 l
282.         else
     
283.         {
     
284.           printf("FIFO没满！！！\n");
     : K( C+ {' z/ Z$ H( X
285.         }
     
286. 
     - u+ s9 i& i& w, R# b2 c: d8 n; u
287.         if(RingBuffer_IsEmpty(fifo) == true)
     . K) G4 T$ x; T5 O. z! \
288.         {
     
289.           printf("FIFO空了！！！\n");
     
290.         }
     4 K7 l) [8 r3 U& b+ \: e5 p
291.         else
     8 R( I- {& i2 l3 X4 g
292.         {
     & u8 l/ f5 c' m( I0 F. {
293.           printf("FIFO没空！！！\n");
     
294.         }
     
295.       }
     
296. 
     # s. F" ?: V$ L8 Z
297.       printf("\n");
     / |/ C' H2 D' O/ n
298. 
     2 v* ^2 Q- c- Y. v" n) Q- Q- [
299.       {
     
300.         uint8_t  rdata[256] = {0};
     
301.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     - y( m% E& m: P- Q" J
302. 
     
303.         if(len > 0)
     
304.         {
     
305.           printf("从FIFO中读出的数据，长度：%d\n", len);
     
306. 
     
307.           for(int i = 0; i < len; i++)
     0 b) u3 L* U  d0 T0 p/ I
308.           {
     . a% r! Y8 `9 H( c
309.             printf("%d ", rdata[i]);
     " \( l8 L0 L2 \9 Z9 B
310.           }
     
311. 
     9 p8 r  ?+ r& t% \
312.           printf("\n");
     
313. 
     ' ?% x5 K( T+ }2 L
314.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     # [1 I7 G8 B! z1 c
315.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     6 J8 D7 o" D" Y( g# c2 ]" ?
316.         }
       c" a3 r$ L6 g
317.         else
     , J5 d' V# @- r, w9 `
318.         {
     1 t; _+ Q+ e8 R7 K/ R
319.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     : @; _  [; t% m5 N$ t  p
320.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
321.         }
     3 y- a9 x/ Z' {
322. 
     ! V; }) e' o7 Y0 g, B
323.         if(RingBuffer_IsFull(fifo) == true)
     
324.         {
     / M9 L; I: X/ s
325.           printf("FIFO满了！！！\n");
     0 R9 _/ g6 w2 R' ~
326.         }
     9 F; p/ U* X8 M
327.         else
     
328.         {
     6 `; w1 j  ~. A+ T# V5 h
329.           printf("FIFO没满！！！\n");
     # N6 v; i6 h, [& w
330.         }
     
331. 
     , m. l; x5 ]; b) d7 F) v! E2 i" N
332.         if(RingBuffer_IsEmpty(fifo) == true)
     5 W+ s- g' r4 c8 ]
333.         {
     
334.           printf("FIFO空了！！！\n");
     . ?0 K, H% g$ O  z: I1 ~
335.         }
     1 V* X, t* D1 j# c2 l3 Z
336.         else
     
337.         {
     
338.           printf("FIFO没空！！！\n");
     1 e& H7 l0 N, o3 x
339.         }
     
340.       }
     
341. 
     
342.       printf("\n\n\n");
     
343.       Sleep(5000);
       U; P6 u/ d7 P& ~2 \* [
344.     }
     
345.   }
     
346.   else
     
347.   {
     , i% j' K- [' X
348.     printf("FIFO创建失败\n");
     
349.   }
     
350. 
     
351.   for(;;)
     
352.   {
     3 [0 C7 U! ~5 e3 B
353. 
     ' i) m7 d" X: [8 {
354.   }
     
355. }
     

复制代码

; _+ ]! Q3 ^& Z; F. R3，运行效果

. Z; Z* C9 s4 M) c  @

谢谢分享

可以直接移植到嵌入式端，非常方便。