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annotate fatfs/option/syscall.c @ 59:488085e0c7e1

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author Daniel O'Connor <darius@dons.net.au>
date Mon, 08 Apr 2013 23:10:47 +0930
parents ace431a0d0f5
children
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1 /*------------------------------------------------------------------------*/
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2 /* Sample code of OS dependent controls for FatFs */
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3 /* (C)ChaN, 2012 */
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4 /*------------------------------------------------------------------------*/
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5
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6 #include <stdlib.h> /* ANSI memory controls */
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7 #include <malloc.h> /* ANSI memory controls */
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8
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9 #include "../ff.h"
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10
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11
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12 #if _FS_REENTRANT
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13 /*------------------------------------------------------------------------*/
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14 /* Create a Synchronization Object
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15 /*------------------------------------------------------------------------*/
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16 /* This function is called in f_mount function to create a new
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17 / synchronization object, such as semaphore and mutex. When a FALSE is
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18 / returned, the f_mount function fails with FR_INT_ERR.
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19 */
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20
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21 int ff_cre_syncobj ( /* 1:Function succeeded, 0:Could not create due to any error */
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22 BYTE vol, /* Corresponding logical drive being processed */
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23 _SYNC_t *sobj /* Pointer to return the created sync object */
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24 )
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25 {
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26 int ret;
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27 // static _SYNC_t sem[_VOLUMES]; /* FreeRTOS */
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29
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30 *sobj = CreateMutex(NULL, FALSE, NULL); /* Win32 */
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31 ret = (*sobj != INVALID_HANDLE_VALUE);
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32
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33 // *sobj = SyncObjects[vol]; /* uITRON (give a static created sync object) */
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34 // ret = 1; /* The initial value of the semaphore must be 1. */
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35
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36 // *sobj = OSMutexCreate(0, &err); /* uC/OS-II */
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37 // ret = (err == OS_NO_ERR);
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38
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39 // if (!sem[vol]) /* FreeRTOS */
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40 // sem[vol] = xSemaphoreCreateMutex();
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41 // *sobj = sem[vol];
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42 // ret = (*sobj != NULL);
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43
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44 return ret;
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45 }
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46
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48
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49 /*------------------------------------------------------------------------*/
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50 /* Delete a Synchronization Object */
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51 /*------------------------------------------------------------------------*/
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52 /* This function is called in f_mount function to delete a synchronization
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53 / object that created with ff_cre_syncobj function. When a FALSE is
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54 / returned, the f_mount function fails with FR_INT_ERR.
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55 */
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56
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57 int ff_del_syncobj ( /* 1:Function succeeded, 0:Could not delete due to any error */
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58 _SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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59 )
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60 {
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61 int ret;
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62
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63
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64 ret = CloseHandle(sobj); /* Win32 */
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65
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66 // ret = 1; /* uITRON (nothing to do) */
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67
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68 // OSMutexDel(sobj, OS_DEL_ALWAYS, &err); /* uC/OS-II */
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69 // ret = (err == OS_NO_ERR);
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70
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71 // ret = 1; /* FreeRTOS (nothing to do) */
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72
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73 return ret;
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74 }
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75
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76
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77
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78 /*------------------------------------------------------------------------*/
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79 /* Request Grant to Access the Volume */
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80 /*------------------------------------------------------------------------*/
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81 /* This function is called on entering file functions to lock the volume.
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82 / When a FALSE is returned, the file function fails with FR_TIMEOUT.
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83 */
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84
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85 int ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
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86 _SYNC_t sobj /* Sync object to wait */
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87 )
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88 {
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89 int ret;
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90
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91 ret = (WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0); /* Win32 */
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92
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93 // ret = (wai_sem(sobj) == E_OK); /* uITRON */
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94
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95 // OSMutexPend(sobj, _FS_TIMEOUT, &err)); /* uC/OS-II */
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96 // ret = (err == OS_NO_ERR);
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97
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98 // ret = (xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE); /* FreeRTOS */
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99
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100 return ret;
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101 }
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102
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103
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104
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105 /*------------------------------------------------------------------------*/
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106 /* Release Grant to Access the Volume */
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107 /*------------------------------------------------------------------------*/
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108 /* This function is called on leaving file functions to unlock the volume.
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109 */
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110
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111 void ff_rel_grant (
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112 _SYNC_t sobj /* Sync object to be signaled */
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113 )
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114 {
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115 ReleaseMutex(sobj); /* Win32 */
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116
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117 // sig_sem(sobj); /* uITRON */
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118
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119 // OSMutexPost(sobj); /* uC/OS-II */
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120
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121 // xSemaphoreGive(sobj); /* FreeRTOS */
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122 }
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123
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124 #endif
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125
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126
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127
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128
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129 #if _USE_LFN == 3 /* LFN with a working buffer on the heap */
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130 /*------------------------------------------------------------------------*/
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131 /* Allocate a memory block */
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132 /*------------------------------------------------------------------------*/
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133 /* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
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134 */
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135
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136 void* ff_memalloc ( /* Returns pointer to the allocated memory block */
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137 UINT msize /* Number of bytes to allocate */
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138 )
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139 {
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140 return malloc(msize);
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141 }
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142
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143
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144 /*------------------------------------------------------------------------*/
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145 /* Free a memory block */
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146 /*------------------------------------------------------------------------*/
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147
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148 void ff_memfree (
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149 void* mblock /* Pointer to the memory block to free */
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150 )
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151 {
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152 free(mblock);
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153 }
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154
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155 #endif