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模仿kfifo实现的环形缓冲区
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  x( ~$ h+ i+ a; Y- N  d
8 E6 @  ~* |' s* i' ~+ Q转载来源：模仿kfifo实现的环形缓冲区


GitHub仓库：http://github.com/XinLiGitHub/RingBuffer
PS：博文不再更新，后续更新会在GitHub仓库进行。

1 X" K6 E' d" D! t    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)。
. \& U# D2 V  ~' C
1，开发环境
# d/ ~8 Z2 r- y# Y% v      1，操作系统：Windows 10 专业版
      2，IDE：Visual Studio 2015 专业版
8 Q# l( ^  Q9 d4 K' a
0 }; ^, k- \$ }3 d6 x7 \+ u2，程序源码
      RingBuffer.h文件
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1. /**
   
2.   ******************************************************************************
   & a5 |/ q* O5 U: D8 l
3.   * @file    RingBuffer.h
   0 C3 `6 g7 L; E0 K2 d
4.   * @author  XinLi
   7 p- Y& D) z% g4 K  G% X
5.   * @version v1.0
   ' j9 ?+ i" B2 B% N' N
6.   * @date    15-January-2018
   % y% P# p4 R+ b! T3 o
7.   * @brief   Header file for RingBuffer.c module.
   
8.   ******************************************************************************
   
9.   * @attention
   : B' ~/ [7 h  M5 N2 o8 F, b. Z
10.   *
    
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    
12.   *
    ! j6 n- z+ Z3 g4 D
13.   * This program is free software: you can redistribute it and/or modify
    . x6 r9 N9 w# U$ [" s
14.   * it under the terms of the GNU General Public License as published by
    # m1 S' I/ E9 Z4 ~7 [
15.   * the Free Software Foundation, either version 3 of the License, or
    ; K  o9 l6 u+ T  |: W0 Z
16.   * (at your option) any later version.
    4 `4 q. b  S  w
17.   *
    ( @! w; J4 Y6 X: C; ?3 J+ k3 G
18.   * This program is distributed in the hope that it will be useful,
    
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    * b' ~8 E- h% {( z2 e( Q& {
21.   * GNU General Public License for more details.
    
22.   *
    5 O+ j# d( ~- g- s3 t
23.   * You should have received a copy of the GNU General Public License
    ; `5 h2 {" r; R. M6 B1 r
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    ' n2 |3 M3 I' F7 t- _3 R
25.   *
    
26.   ******************************************************************************
    4 L  q$ y* R  e- w3 x$ ?6 \
27.   */
    : B1 V4 J1 z5 Z8 n5 |$ M/ l( K% i; [
28. 
    
29. #ifndef __RINGBUFFER_H
    
30. #define __RINGBUFFER_H
    
31. 
    
32. #ifdef __cplusplus
    7 m+ Y2 V) b8 e4 M9 d6 I( P! D) u
33. extern "C" {
    . `: C+ B+ A! }. W
34. #endif
    
35. 
    
36. /* Header includes -----------------------------------------------------------*/
    ! W8 t3 j1 \1 J7 K2 ]- M
37. #include <stdint.h>
    8 P- [, C. l) A7 }$ M6 W
38. #include <stdbool.h>
    
39. 
    % q' y% y  H3 r2 F3 b" C
40. /* Macro definitions ---------------------------------------------------------*/
    9 ?7 R( s. Y0 W/ B  m& C7 [* `
41. #define RING_BUFFER_MALLOC(size)  malloc(size)
    
42. #define RING_BUFFER_FREE(block)   free(block)
    
43. 
    
44. /* Type definitions ----------------------------------------------------------*/
    
45. typedef struct
    5 E( O* e0 {- m
46. {
    $ U. R7 ~6 D* V
47.   uint8_t *buffer;
    0 n+ C% P2 c8 Q, ?
48.   uint32_t size;
    
49.   uint32_t in;
    
50.   uint32_t out;
    / G7 y* {' D3 l8 A; }* Q& n
51. }RingBuffer;
    
52. 
    ' m$ [! S$ B) u
53. /* Variable declarations -----------------------------------------------------*/
    & @. j( N# u/ {# m3 {
54. /* Variable definitions ------------------------------------------------------*/
    
55. /* Function declarations -----------------------------------------------------*/
    
56. RingBuffer *RingBuffer_Malloc(uint32_t size);
    
57. void RingBuffer_Free(RingBuffer *fifo);
    , I( E. k& F* c+ F& p; |
58. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len);
    
59. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len);
      p3 H7 i1 B% Q3 W
60. 
    
61. /* Function definitions ------------------------------------------------------*/
      l. N+ f5 F+ @# w
62. 
    
63. /**
    
64.   * @brief  Removes the entire FIFO contents.
    0 n& ?( B% i) e5 k5 C8 u
65.   * @param  [in] fifo: The fifo to be emptied.
    
66.   * @return None.
    * w6 ~  E5 Y* I# W3 p' @, v
67.   */
    
68. static inline void RingBuffer_Reset(RingBuffer *fifo)
    
69. {
    5 n1 k. v( n7 k; D' ]/ T
70.   fifo->in = fifo->out = 0;
    6 ]; l  {8 k- ?1 u1 X8 q
71. }
    
72. 
    ( q" W' s, s! [& P
73. /**
    ) ^- ?  i: u6 M5 x
74.   * @brief  Returns the size of the FIFO in bytes.
    
75.   * @param  [in] fifo: The fifo to be used.
    4 b/ r, b: C7 x. g
76.   * @return The size of the FIFO.
    # I# O" S, M( O$ X& r0 n$ L
77.   */
    
78. static inline uint32_t RingBuffer_Size(RingBuffer *fifo)
    0 l+ W* |1 O, E6 r6 p' n, T
79. {
    
80.   return fifo->size;
    - A$ r+ z! u& R( D2 k7 b
81. }
    
82. 
    
83. /**
    
84.   * @brief  Returns the number of used bytes in the FIFO.
    
85.   * @param  [in] fifo: The fifo to be used.
    
86.   * @return The number of used bytes.
    
87.   */
    , ~  e2 F; x5 Q# X0 F8 D1 A
88. static inline uint32_t RingBuffer_Len(RingBuffer *fifo)
    
89. {
    3 V( z7 \) @# {
90.   return fifo->in - fifo->out;
    
91. }
    
92. 
    $ j, V! \1 Y9 _8 B
93. /**
    8 E5 q2 C( V: O  ~. j. a  e: W
94.   * @brief  Returns the number of bytes available in the FIFO.
    # F+ J) W, x1 o) p' J  s3 w
95.   * @param  [in] fifo: The fifo to be used.
    * j5 {. ~* C/ S  T5 {
96.   * @return The number of bytes available.
    1 L- T( B! G! w0 E
97.   */
    
98. static inline uint32_t RingBuffer_Avail(RingBuffer *fifo)
    
99. {
    
100.   return RingBuffer_Size(fifo) - RingBuffer_Len(fifo);
     - ~, Y2 \. R1 O' P9 d  w" @1 ^
101. }
     ( c3 ?; ?$ D! B# W; u' F# z6 E
102. 
     ' Q4 A! q0 M1 S* w
103. /**
     : m, W1 S/ y- ~$ x& I0 ^
104.   * @brief  Is the FIFO empty?
     
105.   * @param  [in] fifo: The fifo to be used.
     2 k6 v, u& |6 b+ Z
106.   * @retval true:      Yes.
     
107.   * @retval false:     No.
     8 t+ w5 R( T+ w$ C8 x
108.   */
     
109. static inline bool RingBuffer_IsEmpty(RingBuffer *fifo)
     
110. {
     
111.   return RingBuffer_Len(fifo) == 0;
     
112. }
     : Y" m0 O  K! H" g8 x+ j
113. 
     % `: ?) q% o$ g: W+ \$ g0 @
114. /**
     3 I) j0 c$ O5 a2 e0 _
115.   * @brief  Is the FIFO full?
     
116.   * @param  [in] fifo: The fifo to be used.
     
117.   * @retval true:      Yes.
     
118.   * @retval false:     No.
     
119.   */
     & N2 V$ |; ]  e4 U' R/ w4 W9 g
120. static inline bool RingBuffer_IsFull(RingBuffer *fifo)
     
121. {
     ( ^& Y7 C% j+ u( C- b; ^' H1 T: |3 Y
122.   return RingBuffer_Avail(fifo) == 0;
     * r( i' c; p+ i2 {7 R% R
123. }
     / t8 }3 ?9 N- T
124. 
     
125. #ifdef __cplusplus
     " j6 M0 t  G. T6 ~7 r/ u0 j
126. }
     ! |( Z7 A' p! U2 D8 @
127. #endif
     5 T7 q' ?2 m, Z8 Y
128. 
     9 `* c; \" i3 M$ C; ^( i! n7 a
129. #endif /* __RINGBUFFER_H */
     4 U$ j; {/ J" y4 Z& J! s7 l

复制代码

      RingBuffer.c文件

1. /**
     g8 u/ B6 K2 }. H. z
2.   ******************************************************************************
   
3.   * @file    RingBuffer.c
   
4.   * @author  XinLi
   
5.   * @version v1.0
   9 U5 L7 \) R  f! o* L
6.   * @date    15-January-2018
   
7.   * @brief   Ring buffer module source file.
   : X) d9 t  L7 @3 f
8.   ******************************************************************************
   
9.   * @attention
   
10.   *
    . [2 n% O* `( s* K! A
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
      R; u- y  M4 D6 k3 E
12.   *
    ( a: p, ^% w% E8 m1 D
13.   * This program is free software: you can redistribute it and/or modify
    : k; v7 D# Q# G0 G
14.   * it under the terms of the GNU General Public License as published by
    " x* w: }+ U9 b2 r, @3 {4 v: ^: L& `
15.   * the Free Software Foundation, either version 3 of the License, or
    ! s$ t6 H* w: H' n- i2 u
16.   * (at your option) any later version.
    * t$ l5 P; K0 Q; x) V& v% r5 T1 s
17.   *
    5 }3 \- U9 u( ?7 I8 Z$ }
18.   * This program is distributed in the hope that it will be useful,
    9 }' B$ @2 M! q+ k
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
21.   * GNU General Public License for more details.
    - u! u1 N% n+ k* n( I
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.   *
    7 o. m! ]7 u8 S  [4 |* _! s
26.   ******************************************************************************
    
27.   */
    
28. 
    / w2 U# f/ R5 {4 p0 X2 i* l( c
29. /* Header includes -----------------------------------------------------------*/
    
30. #include "RingBuffer.h"
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31. #include <stdlib.h>
    2 T; c9 Q) {8 _6 Y
32. #include <string.h>
    
33. 
    
34. /* Macro definitions ---------------------------------------------------------*/
    5 M7 K" m! n+ k$ Q( A. f
35. /* Type definitions ----------------------------------------------------------*/
    
36. /* Variable declarations -----------------------------------------------------*/
    
37. /* Variable definitions ------------------------------------------------------*/
    ! u' |! E& E7 M) S
38. /* Function declarations -----------------------------------------------------*/
    
39. static bool is_power_of_2(uint32_t x);
    8 }* K8 I' Y! ?; o5 ?6 q) L, A
40. static uint32_t roundup_pow_of_two(uint32_t x);
    ' Z8 X" Z+ E( x- b, C
41. 
    & [3 Q0 }5 g/ H: P6 A3 b( B8 }( D' T( b
42. /* Function definitions ------------------------------------------------------*/
    
43. 
    ' ~/ b: ~# d) y
44. /**
    4 I2 V7 w3 o7 O9 B
45.   * @brief  Allocates a new FIFO and its internal buffer.
    
46.   * @param  [in] size: The size of the internal buffer to be allocated.
    
47.   * @note   The size will be rounded-up to a power of 2.
    
48.   * @return RingBuffer pointer.
    
49.   */
    . p7 d$ s  h; T' P1 _1 P. z
50. RingBuffer *RingBuffer_Malloc(uint32_t size)
    
51. {
    7 p. H: G1 i, D) z4 n. F
52.   RingBuffer *fifo = RING_BUFFER_MALLOC(sizeof(RingBuffer));
    
53. 
    4 h+ L! \9 L0 e" y' p
54.   if(fifo != NULL)
    
55.   {
    
56.     if(is_power_of_2(size) != true)
    
57.     {
    1 l4 r9 F1 Q) `' u- H# U- V9 ]
58.       if(size > 0x80000000UL)
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59.       {
    - k+ r# }/ p# t7 N8 D- V, G
60.         RING_BUFFER_FREE(fifo);
    
61.         fifo = NULL;
    ( t$ q5 M6 e& d* K9 q# z
62.         return fifo;
    
63.       }
    + @1 g9 m0 {% u8 u& ^7 p
64. 
    * ]) E2 b2 u( ?
65.       size = roundup_pow_of_two(size);
    
66.     }
      @. ~& y9 c8 f
67. 
    
68.     fifo->size   = size;
    
69.     fifo->in     = 0;
    / N  k# D4 c/ O( K5 D
70.     fifo->out    = 0;
    
71.     fifo->buffer = RING_BUFFER_MALLOC(fifo->size);
    
72. 
    
73.     if(fifo->buffer == NULL)
    
74.     {
    ' O9 l$ c* H# G# h. {
75.       RING_BUFFER_FREE(fifo);
    
76.       fifo = NULL;
    
77.       return fifo;
    
78.     }
    
79.   }
    
80. 
    & Q  Y% L' [/ @( C
81.   return fifo;
    
82. }
    
83. 
    , D/ V+ p) n  K" K
84. /**
    
85.   * @brief  Frees the FIFO.
    - F+ i( k( W0 N& o
86.   * @param  [in] fifo: The fifo to be freed.
    $ f  t  b8 b4 \" w+ h4 J) R
87.   * @return None.
    
88.   */
    
89. void RingBuffer_Free(RingBuffer *fifo)
    5 x. ?$ a( J  y. x+ k3 c3 R1 N
90. {
    
91.   RING_BUFFER_FREE(fifo->buffer);
    ' A1 X( v  W- I( Q* p/ G9 v
92.   RING_BUFFER_FREE(fifo);
    
93.   fifo = NULL;
    0 V( ?0 V2 c$ C# a4 O7 O
94. }
    
95. 
    
96. /**
    6 E( N4 p; b) P0 X4 t7 B7 e
97.   * @brief  Puts some data into the FIFO.
    0 H( l$ W  n. N+ ]( Z
98.   * @param  [in] fifo: The fifo to be used.
    $ a5 A( e$ i( M* m! H" }# j& x
99.   * @param  [in] in:   The data to be added.
    
100.   * @param  [in] len:  The length of the data to be added.
     5 l: x  K" t) ?& e5 G* i$ i# a
101.   * @return The number of bytes copied.
     
102.   * @note   This function copies at most @len bytes from the @in into
     $ v4 p5 F& s7 Y; m
103.   *         the FIFO depending on the free space, and returns the number
     
104.   *         of bytes copied.
     3 ^) I8 @$ T4 }9 M( M$ w$ `
105.   */
     3 `5 U2 g6 K  P6 A4 E
106. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len)
     
107. {
     1 W3 R. L2 g' l3 }& I% t# [3 Q
108.   len = min(len, RingBuffer_Avail(fifo));
     
109. 
     
110.   /* First put the data starting from fifo->in to buffer end. */
     
111.   uint32_t l = min(len, fifo->size - (fifo->in & (fifo->size - 1)));
     
112.   memcpy(fifo->buffer + (fifo->in & (fifo->size - 1)), in, l);
     & g+ l, ^) o( |. y+ D, Z2 V
113. 
     6 g2 x& B) R) F2 R% B8 \
114.   /* Then put the rest (if any) at the beginning of the buffer. */
     
115.   memcpy(fifo->buffer, (uint8_t *)in + l, len - l);
     
116. 
     
117.   fifo->in += len;
     
118. 
     
119.   return len;
     
120. }
     
121. 
     
122. /**
     3 f: h  l/ l  K% F7 o5 ], q( `
123.   * @brief  Gets some data from the FIFO.
     " y; Q% F0 y- j
124.   * @param  [in] fifo: The fifo to be used.
     
125.   * @param  [in] out:  Where the data must be copied.
     3 c$ Y* x' m7 J$ ^9 b, `
126.   * @param  [in] len:  The size of the destination buffer.
     
127.   * @return The number of copied bytes.
     
128.   * @note   This function copies at most @len bytes from the FIFO into
     
129.   *         the @out and returns the number of copied bytes.
     
130.   */
     
131. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len)
     
132. {
     - ], i( ^4 j2 J. T
133.   len = min(len, RingBuffer_Len(fifo));
     
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. 
     7 {, n% V7 H" b: A) @$ @2 v
139.   /* Then get the rest (if any) from the beginning of the buffer. */
     
140.   memcpy((uint8_t *)out + l, fifo->buffer, len - l);
     
141. 
     # K7 z/ a* i( z
142.   fifo->out += len;
     
143. 
     + B8 W) [& ?8 v$ W, w" }
144.   return len;
     ) Q' U4 r! V( i1 X" U( T" P
145. }
     $ c8 u; z  m& i: W) G6 u" n
146. 
     ! S3 P( m- ]- }! V
147. /**
     
148.   * @brief  Determine whether some value is a power of two.
     
149.   * @param  [in] x: The number to be confirmed.
     
150.   * @retval true:   Yes.
     
151.   * @retval false:  No.
       E  K8 n; j( N% D/ h" F6 d
152.   * @note   Where zero is not considered a power of two.
     ! S2 l# ]- Y. }( K+ g/ z) n, {
153.   */
     
154. static bool is_power_of_2(uint32_t x)
     + I7 F3 E% ]% D9 M5 n- }
155. {
     : I8 [+ M" K/ r. c/ p2 I& J
156.   return (x != 0) && ((x & (x - 1)) == 0);
     : z" ]3 Y- T, b8 N3 {5 Y$ d6 `
157. }
       [  k! q+ W/ V( f; \$ i# h
158. 
     : L8 _$ e* d/ [% O* r7 o4 q4 J
159. /**
     2 D! A0 l4 U4 u; C6 ]) ~* j
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.
     % A* c' Z; t" e8 d
163.   */
     
164. static uint32_t roundup_pow_of_two(uint32_t x)
     & D& |2 F# D& y7 |0 V
165. {
     
166.   uint32_t b = 0;
     
167. 
     
168.   for(int i = 0; i < 32; i++)
     1 d, E. W- y, N( n% C4 Z5 ?
169.   {
     
170.     b = 1UL << i;
     6 J1 M& h( R; i: d2 p8 v
171. 
     
172.     if(x <= b)
     9 J5 q7 n* Z/ ~9 X' ~: C* W+ f
173.     {
     
174.       break;
     
175.     }
     
176.   }
     ) {4 {& v' A, q
177. 
     : U; i% q' ^. g. e0 {
178.   return b;
     
179. }
     8 t; P. f" I7 i% ~; x

复制代码

      main.c文件
& s" [) L9 U* O- P6 ~7 \/ S7 _/ x8 c& I

1. /**
   
2.   ******************************************************************************
   1 m  U8 \  e: I2 Y+ ]
3.   * @file    main.c
   
4.   * @author  XinLi
   
5.   * @version v1.0
   , Q7 x3 i" @1 H2 t6 z1 I7 d
6.   * @date    15-January-2018
   3 \# d' w9 Z* C/ \' l
7.   * @brief   Main program body.
   9 c/ i) i* D0 m2 J5 r" D% ]& T
8.   ******************************************************************************
   & T1 V9 K) r# U% G' m
9.   * @attention
   
10.   *
    
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    
12.   *
    
13.   * This program is free software: you can redistribute it and/or modify
    2 {5 F/ p% |) n: o
14.   * it under the terms of the GNU General Public License as published by
    . J( H$ M9 b3 Z" q7 ~& f! r
15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    / Z$ V$ {! A0 k* }9 o
17.   *
    5 u( t* f8 c1 t
18.   * This program is distributed in the hope that it will be useful,
    
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
21.   * GNU General Public License for more details.
    ! ~; a+ J4 |1 u
22.   *
    . Z! h: `1 F$ n  U2 x) A6 i6 k6 \2 T
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.   *
    - I4 V! I  D5 [$ q, q
26.   ******************************************************************************
    & v' t9 t* h# g; {4 p. b2 n
27.   */
    6 r  T2 R% d: s
28. 
    2 g0 c! f% a- p( A
29. /* Header includes -----------------------------------------------------------*/
    
30. #include "RingBuffer.h"
    
31. #include <stdio.h>
    
32. #include <windows.h>
    
33. 
    
34. /* Macro definitions ---------------------------------------------------------*/
    7 Z0 Y( e! n) ?; B" N8 D
35. /* Type definitions ----------------------------------------------------------*/
    
36. /* Variable declarations -----------------------------------------------------*/
    
37. /* Variable definitions ------------------------------------------------------*/
    
38. /* Function declarations -----------------------------------------------------*/
    
39. /* Function definitions ------------------------------------------------------*/
    3 [) i& w0 D: D9 _/ C
40. 
    $ Y0 ^2 o: z) E7 @' i" f9 w
41. /**
    
42.   * @brief  Main program.
    
43.   * @param  None.
    
44.   * @return None.
    " x4 Y0 x; `4 {  ?! A
45.   */
    + Q0 t$ P. K: h0 v
46. int main(void)
    6 g  K' Y% ]6 X8 c  I9 M" M! ^
47. {
    
48.   uint8_t data[256] = {0};
    ' L' w) W; J( ?+ R+ t, w$ g
49. 
    
50.   for(int i = 0; i < sizeof(data); i++)
    
51.   {
    
52.     data[i] = i;
    
53.   }
    
54. 
    ! z$ n* ?0 ^: X: x
55.   RingBuffer *fifo = RingBuffer_Malloc(sizeof(data));
    
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. 
    3 a" c- e1 a$ I/ q. R
62.     if(RingBuffer_IsFull(fifo) == true)
    ! s( j! M* i; Y& m: z/ q
63.     {
    . K& L3 {+ o5 ^: I7 Q1 @
64.       printf("FIFO满了！！！\n");
    / f6 c. L0 I6 o6 G" U+ q& l* ^
65.     }
    
66.     else
    : W& \4 f: F0 ^3 z
67.     {
    - B7 N, e; J( K  _/ ~
68.       printf("FIFO没满！！！\n");
    
69.     }
    ( f; V! F' Y0 W
70. 
    . j  w: B5 Z& n$ [7 @) M
71.     if(RingBuffer_IsEmpty(fifo) == true)
    0 q3 c/ c7 B: m9 s$ {2 F' d
72.     {
    4 g! ]8 R6 G: J
73.       printf("FIFO空了！！！\n");
    
74.     }
    
75.     else
    - u* Y4 p: J  m5 H. z# [
76.     {
    
77.       printf("FIFO没空！！！\n");
    
78.     }
    
79. 
    ( c1 L9 @6 N" l
80.     printf("\n");
    # w" h" N! ]5 a" T& Y
81. 
    & J' H- b) e( Z& c8 Q: n! j
82.     for(;;)
    : o  h1 n- ]* M) L
83.     {
    0 c& s& U# F0 ?% O
84.       {
    - S, c+ }% H4 e* {5 k% a
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",
    5 _' e5 j. M( c! T" V
88.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    ! X; j- H! S: T2 d; w
89.         }
    % i5 s4 t7 D  K) ~; t$ ^. \4 I
90.         else
      f; C6 y( J# P  p
91.         {
    / s; k5 A2 k% |
92.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    1 K; V# W3 J% X- k+ i
93.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    
94.         }
    : D8 [5 Q$ U/ W' x, |3 Z* ~
95. 
    
96.         if(RingBuffer_IsFull(fifo) == true)
    , u% j0 U0 o# |& C* G% m) [
97.         {
    
98.           printf("FIFO满了！！！\n");
    7 c6 o& p. o3 H" ^
99.         }
    + q+ H, B: t: m' j* y4 b& Y$ B  y3 B9 o" W
100.         else
     % D7 w. \( i7 X1 E8 k6 [. Z' l- ~
101.         {
     
102.           printf("FIFO没满！！！\n");
     
103.         }
     
104. 
     ( R8 \0 L6 P, w% {/ f: }
105.         if(RingBuffer_IsEmpty(fifo) == true)
     0 I( O8 Y  u3 U) H2 I
106.         {
     . n- I1 T: n) k6 j% \! P
107.           printf("FIFO空了！！！\n");
     * z+ V( H1 I9 {
108.         }
       j/ h5 ]+ M! h& N" ^3 {- G
109.         else
     
110.         {
     8 }. B2 V' P. e0 ?& G
111.           printf("FIFO没空！！！\n");
     
112.         }
     
113.       }
     
114. 
     
115.       printf("\n");
     , F, m+ j- J2 @
116. 
     
117.       {
     4 {, j. k( {+ s4 ]2 c- Y
118.         uint8_t rdata[64] = {0};
     
119.         uint8_t len       = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     
120. 
     - [/ g: X0 j4 U' ]5 R0 Y  ?2 H" n
121.         if(len > 0)
     
122.         {
     " k: ~' h* T: L6 Q+ M+ y, e
123.           printf("从FIFO中读出的数据，长度：%d\n", len);
     
124. 
     % L9 M* g4 d- @0 e, N/ P
125.           for(int i = 0; i < len; i++)
     6 D( @( k9 s* S3 n
126.           {
     8 V" z9 L! d8 ]& J7 q
127.             printf("%d ", rdata[i]);
     
128.           }
       ^3 h" H& D3 E5 U' Z; v8 e
129. 
     7 A( B/ Q/ O# Z) v1 K4 C
130.           printf("\n");
     
131. 
     / l3 B5 t1 O3 k" X+ o; x9 e
132.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     9 Q; n7 E, j$ w2 T" \
133.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
134.         }
     - n# P7 A$ t3 v2 ]$ C( I5 A
135.         else
     : _  b  I3 y' U+ X
136.         {
     6 R% s3 Z* M' W, ~8 S* Q. e
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));
     2 Q! ]' B5 [8 w; ?* y$ n) E0 c
139.         }
     1 G1 y' q+ z1 K4 i1 O
140. 
     
141.         if(RingBuffer_IsFull(fifo) == true)
     
142.         {
     
143.           printf("FIFO满了！！！\n");
     3 P0 n8 l' \8 K8 x; n8 \
144.         }
     2 O' B1 b. Z& X8 k
145.         else
     
146.         {
     
147.           printf("FIFO没满！！！\n");
     
148.         }
     
149. 
     ! _7 {) W; W: c. e/ |1 s, H+ O- ~
150.         if(RingBuffer_IsEmpty(fifo) == true)
     
151.         {
     
152.           printf("FIFO空了！！！\n");
     * r+ {9 e3 Q8 u, r# J
153.         }
     
154.         else
     ' g& j  P1 W1 j; U6 b. d% `
155.         {
     ; n$ V. b, K4 U0 M
156.           printf("FIFO没空！！！\n");
     
157.         }
     
158.       }
     
159. 
     9 d( g! ?. o, ~. Y8 c
160.       printf("\n");
     3 D. W: F- S4 h2 [9 b
161. 
     
162.       {
     
163.         RingBuffer_Reset(fifo);
     
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. 
     ; y- }0 w( l. Q# b. [1 \
167.         if(RingBuffer_IsFull(fifo) == true)
     
168.         {
     & V5 R8 N/ l% m
169.           printf("FIFO满了！！！\n");
     ' y6 D3 M7 a1 ]! k
170.         }
     - L0 _( @- z2 t3 M
171.         else
     ' W* o, P/ {1 u* M
172.         {
     . H/ M% m" t% V
173.           printf("FIFO没满！！！\n");
     
174.         }
       o. x9 [& N  c' G8 }
175. 
     # F# v( o# ^: m. i
176.         if(RingBuffer_IsEmpty(fifo) == true)
     
177.         {
     
178.           printf("FIFO空了！！！\n");
     
179.         }
     1 e* b6 W+ J  }/ R, _9 Z4 N. W
180.         else
     
181.         {
     
182.           printf("FIFO没空！！！\n");
     
183.         }
     : D/ a+ h+ S) x( X# N" m. a
184.       }
     
185. 
     
186.       printf("\n");
     
187. 
     
188.       {
     
189.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     1 p4 m- A0 ~- }# F
190.         {
     . ~% p' G2 b, S* p4 B- t
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));
     
193.         }
     9 z7 o/ R; D5 N+ t. L  v: a: ?
194.         else
     
195.         {
     8 d5 u/ x3 v4 ]. _! |
196.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     . p; k) y( ?4 I$ e: q* `
197.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     / ?: s4 i9 X* {9 r. e+ H* s& {* Y% {
198.         }
     9 O' _( p' O$ A6 V4 W% O- {" R) G, m2 u
199. 
     0 [& q) _' s; W* b( O6 \5 U
200.         if(RingBuffer_IsFull(fifo) == true)
     
201.         {
     
202.           printf("FIFO满了！！！\n");
     
203.         }
     
204.         else
     , Q$ h: D) H' h* T( x7 N# o
205.         {
     ) T6 \+ V9 Q4 p  B* @& @
206.           printf("FIFO没满！！！\n");
     3 D0 {/ E7 M7 L+ Y
207.         }
     4 [' e) B& R  P  c5 [5 e3 W
208. 
     
209.         if(RingBuffer_IsEmpty(fifo) == true)
     
210.         {
     : _! F; B6 q; P: ?
211.           printf("FIFO空了！！！\n");
     # D) @+ A9 V1 B, _# c
212.         }
     ! {* ?. [4 f, ]$ }7 V. q* }
213.         else
     
214.         {
     
215.           printf("FIFO没空！！！\n");
     
216.         }
     
217.       }
     ) y# c$ ~# p) M9 i
218. 
     
219.       printf("\n");
     
220. 
     
221.       {
     
222.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     
223.         {
     
224.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     $ T6 f% T$ h# P  V2 X4 E
225.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
226.         }
     
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",
     
230.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     * I0 e4 l. p8 W5 `( c. N
231.         }
     
232. 
     
233.         if(RingBuffer_IsFull(fifo) == true)
     
234.         {
     
235.           printf("FIFO满了！！！\n");
     . e! @/ f2 Z6 z* w
236.         }
     
237.         else
     
238.         {
     
239.           printf("FIFO没满！！！\n");
     / j* W: u4 c( [( k, w' L. M3 ^
240.         }
     4 I6 d7 Y7 @2 G, x  W
241. 
     6 z% H# Z3 B% _% n+ N
242.         if(RingBuffer_IsEmpty(fifo) == true)
     ! ?2 ^: B9 h% k6 N' v& U( }8 `
243.         {
     6 X& d& H! P: Z" j
244.           printf("FIFO空了！！！\n");
     4 I# d' `# e/ S- l0 e. H: A
245.         }
     % e5 `: E- v% H/ Q0 F+ F7 L
246.         else
     
247.         {
     
248.           printf("FIFO没空！！！\n");
     
249.         }
     4 X! D. {/ M* R: L/ N) p; b  A
250.       }
     
251. 
     
252.       printf("\n");
     0 G" q2 p, m- t, y; k; V
253. 
     1 E+ A: e# {9 Q
254.       {
     9 `+ x1 O9 B' \# }% w/ l4 ]
255.         uint8_t  rdata[256] = {0};
     
256.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     6 Z* [7 \; E6 S2 T
257. 
     ' H9 X4 f% D, N5 y  Q) H+ j8 S
258.         if(len > 0)
     
259.         {
     
260.           printf("从FIFO中读出的数据，长度：%d\n", len);
     
261. 
     
262.           for(int i = 0; i < len; i++)
     
263.           {
     ' ]: `* w1 a. {7 n9 H" J9 i
264.             printf("%d ", rdata[i]);
     2 l6 I" R, s3 v( \
265.           }
     . f2 E, W# ^& n
266. 
     
267.           printf("\n");
     & |* ~: R8 W4 M
268. 
     
269.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     ( a, {) P: C; \3 L
270.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     " a" ]# P4 N. U1 e* o! w# }) c
271.         }
     # s# E6 X7 A5 \( x7 S& K
272.         else
     
273.         {
     ( z% M5 e) ~. L' G6 G$ U
274.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     1 x$ L% J/ V8 k" _1 G
275.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     4 t' ~4 |% Z7 |! |
276.         }
     
277. 
     7 b7 m$ f: a- d
278.         if(RingBuffer_IsFull(fifo) == true)
     3 L! c9 A, Q) ^
279.         {
     
280.           printf("FIFO满了！！！\n");
     
281.         }
     % Y6 i1 G! Y  p! N
282.         else
     4 }6 r% L/ S4 b2 _; I) ^
283.         {
     
284.           printf("FIFO没满！！！\n");
     
285.         }
     / ?4 I$ s, ?4 m+ a7 m! [; U) @
286. 
     
287.         if(RingBuffer_IsEmpty(fifo) == true)
     6 u. u3 _7 ~0 M% t6 H
288.         {
     
289.           printf("FIFO空了！！！\n");
     4 j/ o1 h' O+ u  t- r2 p7 l
290.         }
     % l# U' C  h: P( r9 G% U: ]
291.         else
     
292.         {
     
293.           printf("FIFO没空！！！\n");
     
294.         }
     " D! ?4 I" I3 p
295.       }
     - P. x3 K" \( C, B
296. 
     
297.       printf("\n");
     $ c6 X# W- C& @. Q: K. D
298. 
     * ?: E7 z, z/ C3 ~5 I- _
299.       {
     
300.         uint8_t  rdata[256] = {0};
     
301.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     & N, v2 C1 ~' f" L) k
302. 
     : ]$ }9 x" U0 G) P
303.         if(len > 0)
     
304.         {
     9 e9 z- @7 O: f2 y" l
305.           printf("从FIFO中读出的数据，长度：%d\n", len);
     ' X+ V8 E! |* Y8 n: Q, G
306. 
     ) L' E/ U: r+ O" I9 t/ m; D
307.           for(int i = 0; i < len; i++)
     # g: `0 \6 X  H
308.           {
     8 j) ]% g0 A, d  s. Z1 H" e
309.             printf("%d ", rdata[i]);
     
310.           }
     1 j- x! s/ @& i+ g8 k5 t) k
311. 
     
312.           printf("\n");
     
313. 
     
314.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
315.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
316.         }
     + k) h3 W# N( k1 h
317.         else
     1 s  }1 ?/ X; ?  Q6 e
318.         {
     
319.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
       G; ~- W( ^" w0 K2 I& }9 |8 m7 z3 W
320.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
321.         }
     6 X+ B% U$ z0 n; H/ F. p  H# ~' g
322. 
     8 f( m6 j" C1 k' |* t1 Z
323.         if(RingBuffer_IsFull(fifo) == true)
     
324.         {
     
325.           printf("FIFO满了！！！\n");
     
326.         }
     $ m- T! t8 ^! g: p- p
327.         else
     
328.         {
     
329.           printf("FIFO没满！！！\n");
     
330.         }
     5 Y" L) P8 |- B$ n) o- U
331. 
     
332.         if(RingBuffer_IsEmpty(fifo) == true)
     " T( r% D5 N  W, @4 F+ H. i. I5 F
333.         {
     " j' ~) T- ^- o, d+ h
334.           printf("FIFO空了！！！\n");
     8 i4 @5 }- M( u: E; J# u( Z) X
335.         }
     
336.         else
     " F; l# k( F, S
337.         {
     # }) |" M: v6 f% v. ?* B5 q" |
338.           printf("FIFO没空！！！\n");
     
339.         }
     ) Z0 `& w: l0 i5 G* m
340.       }
     
341. 
     ! H, C; [8 B- W4 v" w
342.       printf("\n\n\n");
     2 n+ f) ?  z8 m
343.       Sleep(5000);
     ( f, G1 v. \! A1 Y- o$ v# W6 A
344.     }
     
345.   }
     
346.   else
     
347.   {
     
348.     printf("FIFO创建失败\n");
     5 S9 y! ?. m' Z7 R6 \
349.   }
     
350. 
     
351.   for(;;)
     ; Y" ^  |% F0 R" S
352.   {
     ) |, u% i4 M- l+ y) W: q
353. 
     ( _! ?2 b+ Z( Z! ?& l1 P
354.   }
     " j2 p# P! x5 _$ `7 `1 O& G  H- m
355. }
     & c0 s! y, w+ T. W  S2 k

复制代码

+ @& W* e3 B$ w' D3，运行效果

' t4 ]4 Q! L% K( M3 Q/ s

谢谢分享

可以直接移植到嵌入式端，非常方便。