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annotate src/g23m-aci/gdd_dio/gdd_dio_queue.c @ 40:614668bbbc4f

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Nucleus: tmt.s ported over from FreeNucleus by XVilka
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 17 Jul 2018 07:55:01 +0000
parents d393cd9bb723
children
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1 /*
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2 +-----------------------------------------------------------------------------
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3 | File : gdd_dio_queue.c
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4 +-----------------------------------------------------------------------------
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5 | Copyright 2002 Texas Instruments Berlin, AG
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6 | All rights reserved.
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7 |
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8 | This file is confidential and a trade secret of Texas
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9 | Instruments Berlin, AG
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10 | The receipt of or possession of this file does not convey
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11 | any rights to reproduce or disclose its contents or to
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12 | manufacture, use, or sell anything it may describe, in
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13 | whole, or in part, without the specific written consent of
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14 | Texas Instruments Berlin, AG.
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15 +-----------------------------------------------------------------------------
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16 | Purpose : Implements the queue functions for the DIO buffer FIFO
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17 +-----------------------------------------------------------------------------
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18 */
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19
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20
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21 #define ENTITY_GDD_DIO
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22
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23 /*==== INCLUDES =============================================================*/
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24
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25 #include "typedefs.h" /* to get Condat data types */
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26 #include "vsi.h" /* to get a lot of macros */
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27
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28 #include <string.h> /* for memset */
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29
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30 #include "gdd_dio_queue.h"
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31
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32 /*==== CONST ================================================================*/
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33
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34 /*==== LOCAL VARS ===========================================================*/
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35
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36 /*==== PRIVATE FUNCTIONS ====================================================*/
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37
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38 /*==== PUBLIC FUNCTIONS =====================================================*/
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39
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40
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41 GLOBAL void gdd_dio_queue_clear(T_GDD_BUF_QUEUE *queue)
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42 {
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43 queue->next_in = 0;
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44 queue->next_out = 0;
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45 memset(queue->elems, 0, sizeof(T_dio_buffer *) * GDD_MAX_DIO_BUF);
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46 }
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47
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48
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49 BOOL gdd_dio_queue_is_empty(const T_GDD_BUF_QUEUE *queue)
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50 {
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51 return (queue->next_in == queue->next_out) &&
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52 (0 == queue->elems[queue->next_out]);
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53 }
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54
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55
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56 GLOBAL BOOL gdd_dio_queue_is_full(const T_GDD_BUF_QUEUE *queue)
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57 {
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58 return (queue->next_in == queue->next_out) &&
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59 !(0 == queue->elems[queue->next_out]);
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60 }
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61
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62
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63 GLOBAL BOOL gdd_dio_dequeue(T_GDD_BUF_QUEUE *queue, T_dio_buffer **elem)
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64 {
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65 if(gdd_dio_queue_is_empty(queue))
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66 {
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67 return FALSE;
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68 }
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69 else
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70 {
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71 (*elem) = queue->elems[queue->next_out];
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72 queue->elems[queue->next_out] = 0;
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73 ++(queue->next_out);
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74 if(queue->next_out EQ GDD_MAX_DIO_BUF)
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75 queue->next_out = 0;
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76 return TRUE;
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77 }
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78 }
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79
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80 GLOBAL BOOL gdd_dio_queue_peek_next_for_dequeue
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81 (const T_GDD_BUF_QUEUE *queue, /*out*/T_dio_buffer **elem)
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82 {
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83 if(gdd_dio_queue_is_empty(queue))
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84 {
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85 return FALSE;
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86 }
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87 else
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88 {
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89 (*elem) = queue->elems[queue->next_out];
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90 return TRUE;
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91 }
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92 }
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93
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94 GLOBAL BOOL gdd_dio_enqueue(T_dio_buffer *elem, T_GDD_BUF_QUEUE *queue, /*out*/U16 *pos)
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95 {
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96 if(gdd_dio_queue_is_full(queue))
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97 {
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98 return FALSE;
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99 }
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100 else
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101 {
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102 queue->elems[queue->next_in] = elem;
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103 (*pos) = queue->next_in;
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104 ++(queue->next_in);
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105 if(queue->next_in EQ GDD_MAX_DIO_BUF)
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106 queue->next_in = 0;
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107 return TRUE;
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108 }
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109 }
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110
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111
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112 GLOBAL void gdd_dio_queue_peek(const T_GDD_BUF_QUEUE *queue, U16 pos, /*out*/T_dio_buffer **elem)
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113 {
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114 (*elem) = queue->elems[pos];
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115 }