1 | /*------------------------------------------------------------------------*/
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2 | /* Sample code of OS dependent controls for FatFs */
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3 | /* (C)ChaN, 2014 */
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4 | /*------------------------------------------------------------------------*/
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5 |
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6 |
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7 | #include "../ff.h"
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8 |
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9 |
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10 | #if _FS_REENTRANT
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11 | /*------------------------------------------------------------------------*/
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12 | /* Create a Synchronization Object
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13 | /*------------------------------------------------------------------------*/
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14 | /* This function is called in f_mount() function to create a new
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15 | / synchronization object, such as semaphore and mutex. When a 0 is returned,
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16 | / the f_mount() function fails with FR_INT_ERR.
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17 | */
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18 |
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19 | int ff_cre_syncobj ( /* !=0:Function succeeded, ==0:Could not create due to any error */
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20 | BYTE vol, /* Corresponding logical drive being processed */
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21 | _SYNC_t *sobj /* Pointer to return the created sync object */
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22 | )
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23 | {
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24 | int ret;
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25 |
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26 |
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27 | *sobj = CreateMutex(NULL, FALSE, NULL); /* Win32 */
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28 | ret = (int)(*sobj != INVALID_HANDLE_VALUE);
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29 |
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30 | // *sobj = SyncObjects[vol]; /* uITRON (give a static created sync object) */
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31 | // ret = 1; /* The initial value of the semaphore must be 1. */
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32 |
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33 | // *sobj = OSMutexCreate(0, &err); /* uC/OS-II */
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34 | // ret = (int)(err == OS_NO_ERR);
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35 |
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36 | // *sobj = xSemaphoreCreateMutex(); /* FreeRTOS */
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37 | // ret = (int)(*sobj != NULL);
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38 |
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39 | return ret;
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40 | }
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41 |
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42 |
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43 |
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44 | /*------------------------------------------------------------------------*/
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45 | /* Delete a Synchronization Object */
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46 | /*------------------------------------------------------------------------*/
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47 | /* This function is called in f_mount() function to delete a synchronization
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48 | / object that created with ff_cre_syncobj function. When a 0 is returned,
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49 | / the f_mount() function fails with FR_INT_ERR.
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50 | */
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51 |
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52 | int ff_del_syncobj ( /* !=0:Function succeeded, ==0:Could not delete due to any error */
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53 | _SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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54 | )
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55 | {
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56 | int ret;
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57 |
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58 |
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59 | ret = CloseHandle(sobj); /* Win32 */
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60 |
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61 | // ret = 1; /* uITRON (nothing to do) */
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62 |
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63 | // OSMutexDel(sobj, OS_DEL_ALWAYS, &err); /* uC/OS-II */
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64 | // ret = (int)(err == OS_NO_ERR);
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65 |
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66 | // vSemaphoreDelete(sobj); /* FreeRTOS */
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67 | // ret = 1;
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68 |
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69 | return ret;
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70 | }
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71 |
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72 |
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73 |
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74 | /*------------------------------------------------------------------------*/
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75 | /* Request Grant to Access the Volume */
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76 | /*------------------------------------------------------------------------*/
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77 | /* This function is called on entering file functions to lock the volume.
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78 | / When a 0 is returned, the file function fails with FR_TIMEOUT.
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79 | */
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80 |
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81 | int ff_req_grant ( /* 1:Got a grant to access the volume, 0:Could not get a grant */
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82 | _SYNC_t sobj /* Sync object to wait */
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83 | )
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84 | {
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85 | int ret;
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86 |
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87 | ret = (int)(WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0); /* Win32 */
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88 |
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89 | // ret = (int)(wai_sem(sobj) == E_OK); /* uITRON */
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90 |
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91 | // OSMutexPend(sobj, _FS_TIMEOUT, &err)); /* uC/OS-II */
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92 | // ret = (int)(err == OS_NO_ERR);
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93 |
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94 | // ret = (int)(xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE); /* FreeRTOS */
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95 |
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96 | return ret;
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97 | }
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98 |
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99 |
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100 |
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101 | /*------------------------------------------------------------------------*/
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102 | /* Release Grant to Access the Volume */
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103 | /*------------------------------------------------------------------------*/
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104 | /* This function is called on leaving file functions to unlock the volume.
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105 | */
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106 |
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107 | void ff_rel_grant (
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108 | _SYNC_t sobj /* Sync object to be signaled */
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109 | )
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110 | {
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111 | ReleaseMutex(sobj); /* Win32 */
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112 |
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113 | // sig_sem(sobj); /* uITRON */
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114 |
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115 | // OSMutexPost(sobj); /* uC/OS-II */
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116 |
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117 | // xSemaphoreGive(sobj); /* FreeRTOS */
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118 | }
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119 |
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120 | #endif
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121 |
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122 |
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123 |
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124 |
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125 | #if _USE_LFN == 3 /* LFN with a working buffer on the heap */
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126 | /*------------------------------------------------------------------------*/
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127 | /* Allocate a memory block */
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128 | /*------------------------------------------------------------------------*/
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129 | /* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
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130 | */
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131 |
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132 | void* ff_memalloc ( /* Returns pointer to the allocated memory block */
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133 | UINT msize /* Number of bytes to allocate */
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134 | )
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135 | {
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136 | return malloc(msize); /* Allocate a new memory block with POSIX API */
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137 | }
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138 |
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139 |
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140 | /*------------------------------------------------------------------------*/
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141 | /* Free a memory block */
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142 | /*------------------------------------------------------------------------*/
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143 |
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144 | void ff_memfree (
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145 | void* mblock /* Pointer to the memory block to free */
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146 | )
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147 | {
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148 | free(mblock); /* Discard the memory block with POSIX API */
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149 | }
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150 |
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151 | #endif
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