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模仿kfifo实现的环形缓冲区

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转载来源：模仿kfifo实现的环形缓冲区


3 ]% t; ]+ K% x5 `$ b4 uGitHub仓库：http://github.com/XinLiGitHub/RingBuffer
( g9 }, Y- |: G  s7 w8 j  pPS：博文不再更新，后续更新会在GitHub仓库进行。
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    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)。
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. J0 Y4 H4 \( D( M7 L: e- w' P1，开发环境
      1，操作系统：Windows 10 专业版
7 ^7 _3 ?! n- {' q6 Q      2，IDE：Visual Studio 2015 专业版
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2，程序源码
& }- y5 R9 V% X* J" \      RingBuffer.h文件

1. /**
   ' _7 G2 d  e; L! M, z
2.   ******************************************************************************
   ; ]+ [% q$ g3 S
3.   * @file    RingBuffer.h
   
4.   * @author  XinLi
   ' o( g- L5 ~% ^- `) |( @' d
5.   * @version v1.0
   ( J! n- P1 |+ I
6.   * @date    15-January-2018
   
7.   * @brief   Header file for RingBuffer.c module.
   5 i- E3 \, X) C; N$ F
8.   ******************************************************************************
   
9.   * @attention
   $ {1 b9 R+ j$ w
10.   *
    ) k. k' J" Z; h; t7 @3 S6 A
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    
12.   *
    3 \/ o( }* K" a3 E
13.   * This program is free software: you can redistribute it and/or modify
    , Z$ I# H2 }: K8 d+ W
14.   * it under the terms of the GNU General Public License as published by
    ( {6 ^  P& U& O! W
15.   * the Free Software Foundation, either version 3 of the License, or
    2 t6 ?* Q9 _2 V
16.   * (at your option) any later version.
    & t  _! y0 S9 J) m% W
17.   *
    : A- D  Q2 @9 ~
18.   * This program is distributed in the hope that it will be useful,
    7 N, [3 R! d4 N9 u
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    ' a$ v/ z1 G4 l$ h
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
21.   * GNU General Public License for more details.
    9 v2 F: w! r) q, B: U
22.   *
    
23.   * You should have received a copy of the GNU General Public License
    * i7 {# t# x! `& l, b
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    / L9 [: k7 {# K# H- s7 U- j$ e
25.   *
    5 M3 p5 H, q& d: G! V
26.   ******************************************************************************
    
27.   */
    
28. 
    & B0 b+ j( ?6 q1 e8 Q
29. #ifndef __RINGBUFFER_H
    
30. #define __RINGBUFFER_H
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31. 
    
32. #ifdef __cplusplus
    
33. extern "C" {
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34. #endif
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35. 
    
36. /* Header includes -----------------------------------------------------------*/
    
37. #include <stdint.h>
    
38. #include <stdbool.h>
    
39. 
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40. /* Macro definitions ---------------------------------------------------------*/
    
41. #define RING_BUFFER_MALLOC(size)  malloc(size)
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42. #define RING_BUFFER_FREE(block)   free(block)
    
43. 
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44. /* Type definitions ----------------------------------------------------------*/
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45. typedef struct
    
46. {
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47.   uint8_t *buffer;
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48.   uint32_t size;
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49.   uint32_t in;
    
50.   uint32_t out;
    
51. }RingBuffer;
    
52. 
    1 w% @' i& O# z" d
53. /* Variable declarations -----------------------------------------------------*/
    
54. /* Variable definitions ------------------------------------------------------*/
    
55. /* Function declarations -----------------------------------------------------*/
    
56. RingBuffer *RingBuffer_Malloc(uint32_t size);
    0 n% \& A# b* ]9 }
57. void RingBuffer_Free(RingBuffer *fifo);
    1 G: J9 j8 l7 y5 b3 A6 m
58. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len);
    
59. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len);
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60. 
    
61. /* Function definitions ------------------------------------------------------*/
    
62. 
    8 \/ J7 Y% M( Z1 s
63. /**
    
64.   * @brief  Removes the entire FIFO contents.
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65.   * @param  [in] fifo: The fifo to be emptied.
    
66.   * @return None.
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67.   */
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68. static inline void RingBuffer_Reset(RingBuffer *fifo)
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69. {
    
70.   fifo->in = fifo->out = 0;
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71. }
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72. 
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73. /**
    
74.   * @brief  Returns the size of the FIFO in bytes.
    
75.   * @param  [in] fifo: The fifo to be used.
    + |/ q* H% ^* E* N" C
76.   * @return The size of the FIFO.
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77.   */
    
78. static inline uint32_t RingBuffer_Size(RingBuffer *fifo)
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79. {
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80.   return fifo->size;
    
81. }
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82. 
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83. /**
    
84.   * @brief  Returns the number of used bytes in the FIFO.
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85.   * @param  [in] fifo: The fifo to be used.
    
86.   * @return The number of used bytes.
    
87.   */
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88. static inline uint32_t RingBuffer_Len(RingBuffer *fifo)
    
89. {
    
90.   return fifo->in - fifo->out;
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91. }
    
92. 
    
93. /**
    
94.   * @brief  Returns the number of bytes available in the FIFO.
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95.   * @param  [in] fifo: The fifo to be used.
    5 ^5 {- a+ S. c: b- h# ]
96.   * @return The number of bytes available.
    
97.   */
    
98. static inline uint32_t RingBuffer_Avail(RingBuffer *fifo)
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99. {
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100.   return RingBuffer_Size(fifo) - RingBuffer_Len(fifo);
     
101. }
     
102. 
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103. /**
     
104.   * @brief  Is the FIFO empty?
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105.   * @param  [in] fifo: The fifo to be used.
     
106.   * @retval true:      Yes.
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107.   * @retval false:     No.
     
108.   */
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109. static inline bool RingBuffer_IsEmpty(RingBuffer *fifo)
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110. {
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111.   return RingBuffer_Len(fifo) == 0;
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112. }
     
113. 
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114. /**
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115.   * @brief  Is the FIFO full?
     
116.   * @param  [in] fifo: The fifo to be used.
     3 C9 ]/ b8 A2 ~1 \# l
117.   * @retval true:      Yes.
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118.   * @retval false:     No.
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119.   */
     
120. static inline bool RingBuffer_IsFull(RingBuffer *fifo)
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121. {
     
122.   return RingBuffer_Avail(fifo) == 0;
     
123. }
     
124. 
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125. #ifdef __cplusplus
     
126. }
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127. #endif
     ( N6 n3 ~3 C# S
128. 
     
129. #endif /* __RINGBUFFER_H */
     

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      RingBuffer.c文件

1. /**
   
2.   ******************************************************************************
   
3.   * @file    RingBuffer.c
   * |4 n* L& m0 E! p
4.   * @author  XinLi
   
5.   * @version v1.0
   
6.   * @date    15-January-2018
   
7.   * @brief   Ring buffer module source file.
   7 H* A$ g1 B: D5 m
8.   ******************************************************************************
   
9.   * @attention
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10.   *
    
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    
12.   *
    / E: O9 e7 e" r% G' ?9 s. c) T" J" n$ t
13.   * This program is free software: you can redistribute it and/or modify
    ! n2 f) o  \2 \1 V9 Y+ |9 a& t
14.   * it under the terms of the GNU General Public License as published by
    3 r( N' v; X* U( E. J# u- j
15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    
17.   *
    # c3 y8 x9 c" _" k) c! |9 j
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
    ' [3 G# [7 k  V4 {0 M
21.   * GNU General Public License for more details.
    1 _: D0 M3 e' j! X. g) E  V" a$ S
22.   *
    " I& A+ w" R* a
23.   * You should have received a copy of the GNU General Public License
    2 k+ l6 J5 J+ B( @& L
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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25.   *
    
26.   ******************************************************************************
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27.   */
    ( O3 |! Q5 n  S, {& f
28. 
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29. /* Header includes -----------------------------------------------------------*/
    
30. #include "RingBuffer.h"
    
31. #include <stdlib.h>
    
32. #include <string.h>
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33. 
    # K" M. |/ L7 T6 `7 G. |
34. /* Macro definitions ---------------------------------------------------------*/
    
35. /* Type definitions ----------------------------------------------------------*/
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36. /* Variable declarations -----------------------------------------------------*/
    
37. /* Variable definitions ------------------------------------------------------*/
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38. /* Function declarations -----------------------------------------------------*/
    # L2 Z/ Z" D7 H6 O4 G8 m( z- B5 y& l
39. static bool is_power_of_2(uint32_t x);
    
40. static uint32_t roundup_pow_of_two(uint32_t x);
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41. 
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42. /* Function definitions ------------------------------------------------------*/
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43. 
    
44. /**
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45.   * @brief  Allocates a new FIFO and its internal buffer.
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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.
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48.   * @return RingBuffer pointer.
    
49.   */
    
50. RingBuffer *RingBuffer_Malloc(uint32_t size)
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51. {
    
52.   RingBuffer *fifo = RING_BUFFER_MALLOC(sizeof(RingBuffer));
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53. 
    
54.   if(fifo != NULL)
    
55.   {
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56.     if(is_power_of_2(size) != true)
    
57.     {
    
58.       if(size > 0x80000000UL)
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59.       {
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60.         RING_BUFFER_FREE(fifo);
    
61.         fifo = NULL;
    
62.         return fifo;
    . j# o- S1 q6 A4 y
63.       }
    
64. 
    
65.       size = roundup_pow_of_two(size);
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66.     }
    5 b# M' Q+ ]: m$ y; S
67. 
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68.     fifo->size   = size;
    6 o5 _8 `7 c$ R; y
69.     fifo->in     = 0;
    
70.     fifo->out    = 0;
    
71.     fifo->buffer = RING_BUFFER_MALLOC(fifo->size);
    
72. 
    
73.     if(fifo->buffer == NULL)
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74.     {
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75.       RING_BUFFER_FREE(fifo);
    
76.       fifo = NULL;
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77.       return fifo;
    
78.     }
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79.   }
    
80. 
    
81.   return fifo;
    5 f/ I. l5 ^. @; @% I2 e# ]* {
82. }
    
83. 
    
84. /**
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85.   * @brief  Frees the FIFO.
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86.   * @param  [in] fifo: The fifo to be freed.
    
87.   * @return None.
    
88.   */
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89. void RingBuffer_Free(RingBuffer *fifo)
    ( J( K* P& \" C! u
90. {
    3 q9 P# I, U( [/ ?, e
91.   RING_BUFFER_FREE(fifo->buffer);
    
92.   RING_BUFFER_FREE(fifo);
    4 h1 s. e! ~7 G2 [3 p
93.   fifo = NULL;
    
94. }
    
95. 
    
96. /**
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97.   * @brief  Puts some data into the FIFO.
    
98.   * @param  [in] fifo: The fifo to be used.
    3 ]' {8 @1 E+ [* H( g* ?0 A
99.   * @param  [in] in:   The data to be added.
    
100.   * @param  [in] len:  The length of the data to be added.
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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
     
104.   *         of bytes copied.
     
105.   */
     - j  c! r& @$ C4 K/ a
106. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len)
     
107. {
     
108.   len = min(len, RingBuffer_Avail(fifo));
       f. f5 [+ B4 Q" G3 v8 ]: \
109. 
     
110.   /* First put the data starting from fifo->in to buffer end. */
     1 B) w. ?+ c/ H  I0 a4 k& D) q  E
111.   uint32_t l = min(len, fifo->size - (fifo->in & (fifo->size - 1)));
     * g2 N7 A. Q* w5 `+ z: e
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);
     
116. 
     
117.   fifo->in += len;
     
118. 
     . m5 _! u" k9 B, r6 g
119.   return len;
     
120. }
     . l7 Z1 `. j1 O
121. 
     % H0 W1 M0 K' z( [
122. /**
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123.   * @brief  Gets some data from the FIFO.
     * [. x/ v  ~, F! N9 c+ A
124.   * @param  [in] fifo: The fifo to be used.
     
125.   * @param  [in] out:  Where the data must be copied.
     - D7 {  H$ t  R" F
126.   * @param  [in] len:  The size of the destination buffer.
     
127.   * @return The number of copied bytes.
     " c! m+ z* S" g; t: R
128.   * @note   This function copies at most @len bytes from the FIFO into
     6 Z, a0 C2 `7 x1 f' }2 h
129.   *         the @out and returns the number of copied bytes.
     ! p) R, V# _! `3 N
130.   */
       Q# q+ \1 `6 F( a' x- \8 S
131. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len)
     
132. {
     ! y. _- n- w1 D
133.   len = min(len, RingBuffer_Len(fifo));
     
134. 
     0 n9 N$ }7 P* R
135.   /* First get the data from fifo->out until the end of the buffer. */
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136.   uint32_t l = min(len, fifo->size - (fifo->out & (fifo->size - 1)));
     # e; m* x7 w( n2 q/ o
137.   memcpy(out, fifo->buffer + (fifo->out & (fifo->size - 1)), l);
     4 `0 n& S/ l! q, h# ]" h
138. 
     
139.   /* Then get the rest (if any) from the beginning of the buffer. */
     # ^; r2 M; w# m7 G, G
140.   memcpy((uint8_t *)out + l, fifo->buffer, len - l);
     ( U8 R% l2 h* _( [3 _4 N2 g
141. 
     
142.   fifo->out += len;
     4 w1 t" y1 V- i5 U  o
143. 
     & U" t/ |+ H; D3 [
144.   return len;
     
145. }
     
146. 
     
147. /**
     # m6 r; |/ ^1 i$ |" O+ Q- _) C
148.   * @brief  Determine whether some value is a power of two.
     
149.   * @param  [in] x: The number to be confirmed.
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150.   * @retval true:   Yes.
     , E- L' c$ s' ^$ s" M; N" J" b
151.   * @retval false:  No.
     
152.   * @note   Where zero is not considered a power of two.
     : L4 o/ s& w! i; U1 Z) ^7 I% [7 M/ b
153.   */
     
154. static bool is_power_of_2(uint32_t x)
     
155. {
     $ Y8 ]- \5 i: H3 @. Y- H. d' h. V
156.   return (x != 0) && ((x & (x - 1)) == 0);
     
157. }
     , J. r( p; }3 C9 E
158. 
     
159. /**
     
160.   * @brief  Round the given value up to nearest power of two.
     
161.   * @param  [in] x: The number to be converted.
     " ^3 M$ t  P) @# V/ }' S
162.   * @return The power of two.
     + j% A7 o% V6 U( |/ y# }
163.   */
     
164. static uint32_t roundup_pow_of_two(uint32_t x)
     
165. {
     
166.   uint32_t b = 0;
     
167. 
     + G+ {2 S, |1 m2 E  Z
168.   for(int i = 0; i < 32; i++)
     ' f) j3 T5 K) t' T, u
169.   {
     ' ~1 ]9 {3 v3 |! n$ _
170.     b = 1UL << i;
     5 O9 c; G) B/ P) P
171. 
     
172.     if(x <= b)
     3 G& X. S% h" J& L& a. `8 t
173.     {
     
174.       break;
     ; h5 _9 j7 m0 X2 e
175.     }
     % a: F$ m# j* [: h
176.   }
     $ y9 r9 e  M1 f' L. s
177. 
     
178.   return b;
     
179. }
     

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      main.c文件

1. /**
   
2.   ******************************************************************************
   
3.   * @file    main.c
   
4.   * @author  XinLi
   
5.   * @version v1.0
   ; z! w0 O$ R0 @% J5 x; d8 [
6.   * @date    15-January-2018
   
7.   * @brief   Main program body.
   
8.   ******************************************************************************
   
9.   * @attention
   ; R- x: n; Q& ]
10.   *
    
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    + l- _0 L- O' X6 w/ K
12.   *
      w3 r' r! E2 r. b5 \! L5 Q: d
13.   * This program is free software: you can redistribute it and/or modify
    , X( Q: d6 O5 S9 u. |+ o
14.   * it under the terms of the GNU General Public License as published by
    ' n- k8 i3 v* V: c$ q
15.   * the Free Software Foundation, either version 3 of the License, or
    % F% m9 G& j. r/ l  d' s  M
16.   * (at your option) any later version.
    
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
    7 U5 @: n8 s' p. L
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    + u) J! g2 t$ Z% G0 E: {& R
21.   * GNU General Public License for more details.
    
22.   *
    5 C7 S$ O6 l3 V6 ]7 F) m% P5 ^
23.   * You should have received a copy of the GNU General Public License
    * c) S; A/ }5 W/ v. `; I" X
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    * m% \$ v# `. ^' r$ N
25.   *
    
26.   ******************************************************************************
    
27.   */
    % q" M% }4 @, P9 d) @
28. 
    4 O7 `. M7 L5 z3 r9 b
29. /* Header includes -----------------------------------------------------------*/
    5 t8 B. J7 {) g* p6 b1 H0 ~3 M1 Q9 O( g
30. #include "RingBuffer.h"
    ! U. G8 l* }( l8 ]. Y4 n
31. #include <stdio.h>
    
32. #include <windows.h>
    ; x8 t  j, x* v$ t1 D
33. 
    
34. /* Macro definitions ---------------------------------------------------------*/
    + @& P* C6 t* O. A6 F# X5 ^0 J4 E
35. /* Type definitions ----------------------------------------------------------*/
    7 A! q( j" M1 Y" K8 s
36. /* Variable declarations -----------------------------------------------------*/
    
37. /* Variable definitions ------------------------------------------------------*/
    
38. /* Function declarations -----------------------------------------------------*/
    
39. /* Function definitions ------------------------------------------------------*/
    
40. 
    
41. /**
    
42.   * @brief  Main program.
    & Q+ R* U- s, b1 r# C6 T; V
43.   * @param  None.
    
44.   * @return None.
    5 n& k: c& S! C" k! R4 c. ?
45.   */
    
46. int main(void)
    
47. {
    
48.   uint8_t data[256] = {0};
    - i$ ?( I4 ]: V% ^9 l& H: J! p
49. 
      K0 [3 L: b. F5 ]
50.   for(int i = 0; i < sizeof(data); i++)
    ( ^. Z9 y; z" l: [4 _
51.   {
    : a% a2 @8 D/ X* N1 O) H
52.     data[i] = i;
    
53.   }
    & o+ ?1 ]6 l7 z! r/ \3 t' r# h1 z: _
54. 
    0 r" c- s2 H  Y6 L# x* b7 _/ P8 C
55.   RingBuffer *fifo = RingBuffer_Malloc(sizeof(data));
    
56. 
    
57.   if(fifo != NULL)
    
58.   {
    " T& g# e% W. i( k3 ]  p/ E3 |/ t/ [
59.     printf("FIFO创建成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    ' g% z( P; ^. \( w* T7 o6 A
60.            RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    3 v- x, m" F3 W8 }  ^& p4 }4 c
61. 
    
62.     if(RingBuffer_IsFull(fifo) == true)
    $ M. {4 t( f! n8 t4 ^' H
63.     {
    1 S0 N8 K* v7 n1 O
64.       printf("FIFO满了！！！\n");
    2 g) v0 o  q9 g9 s0 A# b! b
65.     }
    
66.     else
    
67.     {
    8 `4 z0 f2 d, |
68.       printf("FIFO没满！！！\n");
    
69.     }
    
70. 
    ' ^* H) A2 m4 h
71.     if(RingBuffer_IsEmpty(fifo) == true)
    4 W, e% A# S- y% J; f. X
72.     {
    7 s/ x: R' ^& H
73.       printf("FIFO空了！！！\n");
    
74.     }
    
75.     else
    . d, s9 q. k: X6 `' U
76.     {
    ( f0 X1 G! L& ~
77.       printf("FIFO没空！！！\n");
    
78.     }
    ( v( m( L$ [  _& H
79. 
    
80.     printf("\n");
    
81. 
    1 b4 c: v+ o, F% c  l& `
82.     for(;;)
    & ~5 v' V, t" d
83.     {
    - V& X5 {1 n9 g6 E
84.       {
    
85.         if(RingBuffer_In(fifo, data, sizeof(data) / 2) > 0)
    
86.         {
    : E' [- s* b% R$ j, R( ~! ?
87.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    + g, N" D7 t. f
88.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    3 s$ x2 ?, Z. ^; g$ J  V
89.         }
    9 A- U+ R/ E  g, I
90.         else
    
91.         {
    
92.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    * V. P; ^0 b) x8 y8 z
93.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    & A+ ?0 J2 b0 s$ L$ ~8 l
94.         }
    
95. 
    
96.         if(RingBuffer_IsFull(fifo) == true)
    ) ^7 M3 t  \) N  A* T5 G+ X( W
97.         {
    
98.           printf("FIFO满了！！！\n");
    
99.         }
    
100.         else
     4 z+ V. U6 l2 J, a
101.         {
     
102.           printf("FIFO没满！！！\n");
     
103.         }
       V$ t$ a, u# c+ A  ~
104. 
     ; a$ p" q$ B$ A( Z, S
105.         if(RingBuffer_IsEmpty(fifo) == true)
     # x" [, g& v+ G# V
106.         {
     
107.           printf("FIFO空了！！！\n");
     
108.         }
     
109.         else
     & a! G* o- ]" m  v
110.         {
       H( {  e5 W* ~  y! U8 S/ z
111.           printf("FIFO没空！！！\n");
     
112.         }
     9 w& f+ A; d' c9 \9 Q" I9 z
113.       }
     
114. 
     & J+ D8 r7 @% C/ K
115.       printf("\n");
     
116. 
     ! G5 F8 d9 V1 n7 Q  @+ g) ^* g
117.       {
     
118.         uint8_t rdata[64] = {0};
     
119.         uint8_t len       = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     3 q5 `& v5 `& D0 J" S' m
120. 
     
121.         if(len > 0)
     & r" g" C' K$ j3 ~
122.         {
     9 w6 Y! [0 t9 d! W
123.           printf("从FIFO中读出的数据，长度：%d\n", len);
     $ m, i/ e: ]; _- T
124. 
     
125.           for(int i = 0; i < len; i++)
     
126.           {
     ! s; V8 u! u9 t) `
127.             printf("%d ", rdata[i]);
     
128.           }
     
129. 
     
130.           printf("\n");
     8 q" b! j* Y/ A$ u6 f
131. 
     5 J% H; {% ^( A0 r0 Y
132.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     2 o& V6 j" H7 D2 x
133.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     ! N2 U+ J& _% z4 t0 O
134.         }
     ' `/ J4 w2 w4 w; B" |. D/ O( b
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",
     $ s$ M# Y1 A; g# K+ e6 |/ a2 h
138.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     9 y4 X  ~6 k5 e( y5 E4 Y
139.         }
     
140. 
     & y5 Y# M0 _; ?8 r
141.         if(RingBuffer_IsFull(fifo) == true)
     # a0 ^8 O7 S' t! y" p& S9 l
142.         {
     
143.           printf("FIFO满了！！！\n");
     
144.         }
     ) @+ y$ `* `; U/ [% _- l
145.         else
       T5 D; w: c3 l$ t
146.         {
     3 m# [8 }& }7 R6 D: S% I% |
147.           printf("FIFO没满！！！\n");
     
148.         }
     
149. 
     " O) K' ~' d" @3 o
150.         if(RingBuffer_IsEmpty(fifo) == true)
     
151.         {
     . X: [3 v, E( q- U% x5 k8 c0 j& H
152.           printf("FIFO空了！！！\n");
     
153.         }
     
154.         else
     
155.         {
     / B9 y  N3 ^4 a
156.           printf("FIFO没空！！！\n");
     
157.         }
     
158.       }
     1 ~) d( [4 Y$ U( V: n; {, z: w
159. 
     0 x3 F. f- M4 q$ c$ D, w+ W5 @* b
160.       printf("\n");
     + p# t8 ]0 L" f$ B/ g$ V/ l0 {
161. 
     
162.       {
     
163.         RingBuffer_Reset(fifo);
     6 L/ N# P- r# s/ E
164.         printf("FIFO清空成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     ; p( y. ^+ |& f8 U7 t- w
165.                RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
166. 
     
167.         if(RingBuffer_IsFull(fifo) == true)
     
168.         {
     
169.           printf("FIFO满了！！！\n");
     0 k# E6 |9 o; t. G
170.         }
     
171.         else
     
172.         {
     ) |% j9 I+ Z8 I$ M8 m; V
173.           printf("FIFO没满！！！\n");
     5 R& u- J4 r3 ]3 W
174.         }
     
175. 
     
176.         if(RingBuffer_IsEmpty(fifo) == true)
     
177.         {
     
178.           printf("FIFO空了！！！\n");
     7 [* C8 R2 I( T% [$ L( N
179.         }
     
180.         else
     
181.         {
     
182.           printf("FIFO没空！！！\n");
     2 |7 }. }* \: }7 r: F
183.         }
     ; X/ z0 A2 A; _1 U1 b
184.       }
     
185. 
     
186.       printf("\n");
     4 }$ @& [  f* i+ |* e; a, a* Z
187. 
     
188.       {
     
189.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     . h3 \, D' [" F- L# @
190.         {
     3 ]+ b* @* y; I/ D0 ~- B6 K
191.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     . M# d8 }; m5 ~- @' A6 X9 N
192.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
193.         }
     / z7 M  Z+ d+ `' g/ o
194.         else
     8 V  k$ H; p/ U
195.         {
     
196.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     $ `, {) f& T2 T3 C. |+ }
197.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     ' E" R# Q( j  k& y+ v$ h' y4 h. Q2 K
198.         }
     - N  ~* v8 _: o# P' P
199. 
     
200.         if(RingBuffer_IsFull(fifo) == true)
     
201.         {
     
202.           printf("FIFO满了！！！\n");
     
203.         }
     5 \1 }& |  \2 |& X4 n2 p
204.         else
     
205.         {
     , z/ z  h/ z, ]6 i0 l' W. B
206.           printf("FIFO没满！！！\n");
     
207.         }
     5 M+ A6 I% |, p% N5 r5 o5 a! h& p
208. 
     $ l3 i4 N8 @9 w/ G
209.         if(RingBuffer_IsEmpty(fifo) == true)
     7 Z) D" q0 ?& g8 {5 U4 p
210.         {
     
211.           printf("FIFO空了！！！\n");
     / X% p+ q1 w3 B) ?8 A
212.         }
     " [. V) [* x% K3 j# v, Z6 n, F" E
213.         else
     
214.         {
     
215.           printf("FIFO没空！！！\n");
     
216.         }
     
217.       }
     7 N9 F. n& n2 a. H2 m* h
218. 
     1 t; t7 C8 Q, [% f
219.       printf("\n");
     
220. 
     ! o& S6 y' r6 [8 B& R5 h* M1 W* Z
221.       {
     ) U* z. D4 u% X
222.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     . I9 z" j7 C1 O9 A5 c# `4 J5 t2 ~2 W
223.         {
     
224.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     ) u) t0 |- h- }/ w
225.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     . x/ j8 Q) O6 @. J7 R, f
226.         }
     5 I' r2 N* `; ]  K# s  i: H4 S
227.         else
     - T9 d2 I/ A7 d+ |* s" Q5 E$ v
228.         {
     " |1 y& }! h8 J) J. @
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));
     
231.         }
     ! M7 M, q# j# a' h. k! g
232. 
     
233.         if(RingBuffer_IsFull(fifo) == true)
     
234.         {
     * {( @1 a1 o, g7 ?. \
235.           printf("FIFO满了！！！\n");
     
236.         }
     8 x3 h- F- M2 m" K3 a: [, Y
237.         else
     
238.         {
     
239.           printf("FIFO没满！！！\n");
     8 ^9 M! v. d5 d* R. E" Q
240.         }
     / k! y) c: N5 Y. N3 ~
241. 
     
242.         if(RingBuffer_IsEmpty(fifo) == true)
     
243.         {
     
244.           printf("FIFO空了！！！\n");
     
245.         }
     
246.         else
     ' O* x9 T- D5 B3 K
247.         {
     
248.           printf("FIFO没空！！！\n");
     1 s5 C8 e3 |) S) B0 r
249.         }
     
250.       }
     
251. 
     
252.       printf("\n");
     
253. 
     5 S/ t8 \& V( K# _& E7 A/ t+ V
254.       {
     
255.         uint8_t  rdata[256] = {0};
     
256.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     , l6 Y. C" L2 @& Z% U1 |6 o3 I4 V
257. 
       q0 ]9 Z( G& Z) o# z+ i. U
258.         if(len > 0)
     . P: p7 Z3 |, w  v- Q
259.         {
     $ n6 z7 N* @( e% l
260.           printf("从FIFO中读出的数据，长度：%d\n", len);
     
261. 
     2 Z. N5 m9 V2 I* [9 D- t) |
262.           for(int i = 0; i < len; i++)
     
263.           {
     
264.             printf("%d ", rdata[i]);
     
265.           }
     
266. 
     : o  p5 ~# q  ?7 Y! U0 p( r
267.           printf("\n");
     & o, _2 I) W- k
268. 
     
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));
     / }, ~2 w7 T/ v) O+ z2 l
271.         }
     6 O9 x8 p. d& l& F# B
272.         else
     
273.         {
     
274.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     / h( m* F. b! L+ [8 e1 T
275.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     2 n7 @4 E7 E! X0 @8 r+ R9 D
276.         }
     
277. 
     9 ]8 t5 b4 s0 {( S3 w* y
278.         if(RingBuffer_IsFull(fifo) == true)
     % T1 t! g; @! D- _# X1 w
279.         {
     6 d: \5 B9 i$ F/ u2 Z+ Z
280.           printf("FIFO满了！！！\n");
     * o, [: B1 s4 s
281.         }
     
282.         else
     
283.         {
     
284.           printf("FIFO没满！！！\n");
     
285.         }
     
286. 
     
287.         if(RingBuffer_IsEmpty(fifo) == true)
     
288.         {
     
289.           printf("FIFO空了！！！\n");
     
290.         }
     
291.         else
     
292.         {
     5 J- k# F& A9 B4 K! f' g
293.           printf("FIFO没空！！！\n");
     
294.         }
     
295.       }
     
296. 
       K! W3 d3 x: C* K$ V/ j1 T% M2 H
297.       printf("\n");
     
298. 
     
299.       {
     
300.         uint8_t  rdata[256] = {0};
     
301.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     - W! L2 r0 B! I$ z0 L9 s) S4 b
302. 
     4 j& @+ z  x1 T, W9 y
303.         if(len > 0)
     
304.         {
     
305.           printf("从FIFO中读出的数据，长度：%d\n", len);
     9 p8 ~! r1 [) V% Y
306. 
     1 H9 x. F, a2 Y: b
307.           for(int i = 0; i < len; i++)
     / e: A3 B* U5 C. s# e
308.           {
     
309.             printf("%d ", rdata[i]);
     
310.           }
     * [5 N! W$ U5 A4 w
311. 
     5 K$ C# k8 t! {% P& H: B
312.           printf("\n");
     ! e  O: z' q) [- n5 ?# m+ y# Q
313. 
     0 s" n5 E7 D6 N8 n- G
314.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     - l+ J3 k8 o- I6 ^, `
315.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     # D& w- [7 u$ W& }
316.         }
     
317.         else
     
318.         {
     6 Q/ |. p' ^$ t/ I1 w& l
319.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     8 U) M- ^7 y) e+ X6 x& U
320.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
321.         }
     
322. 
     ; }5 D) n  @0 `! B. K+ }
323.         if(RingBuffer_IsFull(fifo) == true)
     2 {9 u' K$ J/ F3 ^8 z' a9 y* G
324.         {
     6 ?* f6 ^1 ?4 {, f4 L: ]% H
325.           printf("FIFO满了！！！\n");
     
326.         }
     
327.         else
     7 X) E# J) q6 L, U+ R% G
328.         {
     / B9 }( a2 L1 \4 A  q, M
329.           printf("FIFO没满！！！\n");
     & T+ b0 C) _9 Y9 o
330.         }
     
331. 
     
332.         if(RingBuffer_IsEmpty(fifo) == true)
     
333.         {
     
334.           printf("FIFO空了！！！\n");
     
335.         }
     4 q. c( A  R- N% n4 @
336.         else
     
337.         {
     
338.           printf("FIFO没空！！！\n");
     
339.         }
     
340.       }
     
341. 
     $ N* s. a# _+ e% G2 R5 y
342.       printf("\n\n\n");
     & U7 p& Q7 E2 m6 T7 \; H) g* B- E
343.       Sleep(5000);
     1 q  t# _( ^! p) c
344.     }
     . E8 U5 M3 @' _% G4 j
345.   }
     
346.   else
     + B' K7 d* p5 A6 m4 v2 l- y  S
347.   {
     
348.     printf("FIFO创建失败\n");
     " Y3 u7 `1 l- ^
349.   }
     . d- a8 T) s( c6 g
350. 
     
351.   for(;;)
     
352.   {
     / u$ a( o1 \0 O' B0 o9 [# y
353. 
     / ^) M, A2 ^' [
354.   }
     
355. }
     

复制代码

/ K+ [2 n4 m' d3，运行效果
4 [0 J/ L6 a, L; a4 u/ R1 o

4 ]" n4 u4 R. n- F7 b$ L6 F# e

谢谢分享

可以直接移植到嵌入式端，非常方便。