1 | /*------------------------------------------------------------------------*/
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2 | /* Sample code of OS dependent synchronization object controls */
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3 | /* for FatFs R0.07a (C)ChaN, 2009 */
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4 | /*------------------------------------------------------------------------*/
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5 |
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6 | //#include <windows.h> // Win32
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7 | #include <kernel.h>
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8 | #include "kernel_cfg.h"
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9 | //#include <ucos_ii.h> // uC/OS-II
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10 |
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11 | #include "../ff.h"
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12 |
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13 | #if _FS_REENTRANT
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14 |
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15 | static const ID VolumeSemId[4] = {
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16 | SEMID_FATFS1,
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17 | SEMID_FATFS2,
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18 | SEMID_FATFS3,
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19 | SEMID_FATFS4
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20 | };
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21 |
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22 | /*------------------------------------------------------------------------*/
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23 | /* Create a Synchronization Object for a Volume */
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24 | /*------------------------------------------------------------------------*/
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25 | /* This function is called in f_mount function to create a new
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26 | / synchronization object, such as semaphore and mutex. When a FALSE is
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27 | / returned, the f_mount function fails with FR_INT_ERR.
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28 | */
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29 |
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30 | BOOL ff_cre_syncobj ( /* TRUE:Function succeeded, FALSE:Could not create due to any error */
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31 | BYTE vol, /* Corresponding logical drive being processed */
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32 | _SYNC_t *sobj /* Pointer to return the created sync object */
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33 | )
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34 | {
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35 | BOOL ret;
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36 |
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37 | // *sobj = CreateMutex(NULL, FALSE, NULL); // Win32
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38 | // ret = (*sobj != INVALID_HANDLE_VALUE) ? TRUE : FALSE; //
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39 |
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40 | *sobj = VolumeSemId[vol]; // uITRON (give a static created sync object)
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41 | ret = TRUE; // The initial value of the semaphore must be 1.
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42 |
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43 | // *sobj = OSMutexCreate(0, &err); // uC/OS-II
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44 | // ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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45 |
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46 | return ret;
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47 | }
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48 |
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49 |
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50 |
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51 | /*------------------------------------------------------------------------*/
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52 | /* Delete a Synchronization Object */
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53 | /*------------------------------------------------------------------------*/
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54 | /* This function is called in f_mount function to delete a synchronization
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55 | / object that created with ff_cre_syncobj function. When a FALSE is
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56 | / returned, the f_mount function fails with FR_INT_ERR.
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57 | */
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58 |
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59 | BOOL ff_del_syncobj ( /* TRUE:Function succeeded, FALSE:Could not delete due to any error */
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60 | _SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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61 | )
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62 | {
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63 | BOOL ret;
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64 |
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65 | // ret = CloseHandle(sobj); // Win32
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66 |
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67 | ret = TRUE; // uITRON (nothing to do)
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68 |
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69 | // OSMutexDel(sobj, OS_DEL_ALWAYS, &err); // uC/OS-II
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70 | // ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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71 |
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72 | return ret;
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73 | }
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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 | /* Request Grant to Access the Volume */
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79 | /*------------------------------------------------------------------------*/
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80 | /* This function is called on entering file functions to lock the volume.
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81 | / When a FALSE is returned, the file function fails with FR_TIMEOUT.
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82 | */
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83 |
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84 | BOOL ff_req_grant ( /* TRUE:Got a grant to access the volume, FALSE:Could not get a grant */
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85 | _SYNC_t sobj /* Sync object to wait */
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86 | )
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87 | {
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88 | BOOL ret;
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89 |
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90 | // ret = (WaitForSingleObject(sobj, _TIMEOUT) == WAIT_OBJECT_0) ? TRUE : FALSE; // Win32
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91 |
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92 | ret = (wai_sem(sobj) == E_OK) ? TRUE : FALSE; // uITRON
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93 |
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94 | // OSMutexPend(sobj, _TIMEOUT, &err)); // uC/OS-II
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95 | // ret = (err == OS_NO_ERR) ? TRUE : FALSE; //
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96 |
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97 | return ret;
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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 | /*------------------------------------------------------------------------*/
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103 | /* Release Grant to Access the Volume */
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104 | /*------------------------------------------------------------------------*/
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105 | /* This function is called on leaving file functions to unlock the volume.
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106 | */
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107 |
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108 | void ff_rel_grant (
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109 | _SYNC_t sobj /* Sync object to be signaled */
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110 | )
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111 | {
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112 | // ReleaseMutex(sobj); // Win32
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113 |
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114 | sig_sem(sobj); // uITRON
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115 |
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116 | // OSMutexPost(sobj); // uC/OS-II
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117 | }
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118 |
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119 |
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120 | #else
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121 |
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122 | #error This file is not needed in this configuration.
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123 |
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124 | #endif
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