📄 fat32.lst
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983 1 temp = fat_dir_list_index - 1;
984 1 fat_seek_first();
985 1 for (; temp != 0; temp--)
986 1 result = fat_goto_next();
987 1 return result;
988 1 }
989
990 /*F**************************************************************************
991 * NAME: fat_seek_first
992 *----------------------------------------------------------------------------
993 * PARAMS:
994 *
995 * return:
996 * - OK: first file found
997 * - KO: low level error
998 *----------------------------------------------------------------------------
999 * PURPOSE:
1000 * Fetch the first directory info in cache
1001 *----------------------------------------------------------------------------
1002 * EXAMPLE:
1003 *----------------------------------------------------------------------------
1004 * NOTE:
1005 *----------------------------------------------------------------------------
1006 * REQUIREMENTS:
1007 *****************************************************************************/
1008 bit fat32_seek_first (void)
1009 {
1010 1 fat32_clear_dir_info();
1011 1 fat_dir_current_sect = fat_dir_start_sect;
1012 1 fat_current_start_entry_position = 0;
1013 1 fat_current_end_entry_position = 0;
1014 1
1015 1 if (dir_is_root)
1016 1 { /* root diretory */
1017 2 fat_dir_list_index = 1;
1018 2 fat32_fetch_file_info(&fat_cache.current, FETCH_NEXT); /* fetch first root entry */
1019 2 return OK;
1020 2 }
1021 1 else
1022 1 { /* not root dir */
1023 2 fat32_fetch_file_info(&fat_cache.parent, FETCH_NEXT); /* dot entry */
1024 2 fat32_fetch_file_info(&fat_cache.parent, FETCH_NEXT); /* dotdot entry */
1025 2 fat_dir_list_index = 2; /* update entry index */
1026 2 return fat32_goto_next(); /* update first file info */
1027 2 }
1028 1 }
1029
1030
1031 /*F**************************************************************************
1032 * NAME: fat_goto_subdir
1033 *----------------------------------------------------------------------------
1034 * PARAMS:
1035 * id: file extension to select
1036 *
1037 * return:
1038 * - OK: subdir selected
C51 COMPILER V7.50 FAT32 11/27/2007 20:46:00 PAGE 18
1039 * - KO: current entry not a directory
1040 * - KO: low level error
1041 *----------------------------------------------------------------------------
1042 * PURPOSE:
1043 * Go to the subdir if current is a directory
1044 *----------------------------------------------------------------------------
1045 * EXAMPLE:
1046 *----------------------------------------------------------------------------
1047 * NOTE:
1048 * Also called by goto_parentdir() with current info from parent info
1049 *----------------------------------------------------------------------------
1050 * REQUIREMENTS:
1051 *****************************************************************************/
1052 bit fat32_goto_subdir (Byte id)
1053 {
1054 1 /* check if current file is a directory */
1055 1 if ((fat_cache.current.attributes & ATTR_DIRECTORY) == ATTR_DIRECTORY)
1056 1 {
1057 2 /* computes the sector address (RELATIVE) */
1058 2 if (fat_cache.current.start_cluster == fat_rootclus_fat32)
1059 2 {
1060 3 return fat32_get_root_directory(id); /* go to root dir */
1061 3 }
1062 2
1063 2 /* go to not root dir */
1064 2 fat32_get_clusters(&dclusters, MAX_DIR_FRAGMENT_NUMBER); /* get directory allocation table */
-
1065 2 fat_last_dclust_index = fat_last_clust_index; /* save last index position for chain cluster
-*/
1066 2 fat_dir_current_sect = (((Uint32)(dclusters[0].cluster)) * fat_cluster_size) /* computes sector add
-ress from allocation table */
1067 2 + fat_ptr_data;
1068 2
1069 2 fat32_get_dir_file_list(id); /* create list of entries */
1070 2 fat_dir_list_index = 1; /* point on first root entry */
1071 2 fat_current_start_entry_position = 0;
1072 2 fat_current_end_entry_position = 0;
1073 2
1074 2 fat32_fetch_file_info(&fat_cache.current, FETCH_NEXT); /* dot entry */
1075 2 fat32_fetch_file_info(&fat_cache.parent, FETCH_NEXT); /* dotdot entry */
1076 2 fat_dir_list_index = 2; /* update index position entry */
1077 2 if(fat_cache.parent.start_cluster == 0x00) /* if parent dir is root */
1078 2 {
1079 3 fat_cache.parent.start_cluster = fat_rootclus_fat32; /* then update start cluster value */
1080 3 }
1081 2 dir_is_root = FALSE;
1082 2 return fat32_goto_next();
1083 2 }
1084 1 else
1085 1 return KO; /* current entry is not a dir */
1086 1 }
1087
1088
1089 /*F**************************************************************************
1090 * NAME: fat_goto_parentdir
1091 *----------------------------------------------------------------------------
1092 * PARAMS:
1093 * id: file extension to select
1094 *
1095 * return:
1096 *----------------------------------------------------------------------------
1097 * PURPOSE:
C51 COMPILER V7.50 FAT32 11/27/2007 20:46:00 PAGE 19
1098 * Go to the parent directory
1099 *----------------------------------------------------------------------------
1100 * EXAMPLE:
1101 *----------------------------------------------------------------------------
1102 * NOTE:
1103 *----------------------------------------------------------------------------
1104 * REQUIREMENTS:
1105 *****************************************************************************/
1106 bit fat32_goto_parentdir (Byte id)
1107 {
1108 1 Uint32 temp_cluster;
1109 1 temp_cluster = dclusters[0].cluster + 2; /* save cluster info */
1110 1 if (temp_cluster != fat_rootclus_fat32)
1111 1 {
1112 2 fat_cache.current = fat_cache.parent; /* goto the parent directory */
1113 2
1114 2 /* issue the equivalent to a cd .. DOS command */
1115 2 if (fat32_goto_subdir(id))
1116 2 {
1117 3 while (temp_cluster != fat_cache.current.start_cluster)
1118 3 {
1119 4 if (fat32_goto_next() == KO)
1120 4 break;
1121 4 }
1122 3 if (temp_cluster == fat_cache.current.start_cluster)
1123 3 return OK;
1124 3 else
1125 3 return KO;
1126 3
1127 3 }
1128 2 else
1129 2 {
1130 3 return KO;
1131 3 }
1132 2 }
1133 1 else
1134 1 {
1135 2 return OK; /* Nothing to do because we are in the root directory */
1136 2 }
1137 1 }
1138
1139
1140
1141 /*F**************************************************************************
1142 * NAME: fat_update_fat_sector
1143 *----------------------------------------------------------------------------
1144 * PARAMS:
1145 * sector_number : fat sector position
1146 *
1147 * return:
1148 *----------------------------------------------------------------------------
1149 * PURPOSE:
1150 * update a sector of fat
1151 *----------------------------------------------------------------------------
1152 * EXAMPLE:
1153 *----------------------------------------------------------------------------
1154 * NOTE:
1155 * This function check if there is 2 fats to be updated
1156 *----------------------------------------------------------------------------
1157 * REQUIREMENTS:
1158 *****************************************************************************/
1159 void fat32_update_fat_sector (Uint16 sector_number)
C51 COMPILER V7.50 FAT32 11/27/2007 20:46:00 PAGE 20
1160 {
1161 1 fat32_up_down_load_sector(fat_ptr_fats + sector_number, DOWNLOAD); /* FAT 1 update */
1162 1 if (fat_2_is_present == TRUE)
1163 1 {
1164 2 fat32_up_down_load_sector(fat_ptr_fats + sector_number + fat_fat_size, DOWNLOAD); /* FAT 2 update */
1165 2 }
1166 1 }
1167
1168
1169 /*F**************************************************************************
1170 * NAME: fat_update_entry_fat
1171 *----------------------------------------------------------------------------
1172 * PARAMS:
1173 *
1174 * return:
1175 *----------------------------------------------------------------------------
1176 * PURPOSE:
1177 * Update root entry and FAT after a writing file session (create or re-write)
1178 *----------------------------------------------------------------------------
1179 * EXAMPLE:
1180 *----------------------------------------------------------------------------
1181 * NOTE:
1182 *----------------------------------------------------------------------------
1183 * REQUIREMENTS:
1184 *
1185 *****************************************************************************/
1186 void fat32_update_entry_fat (void)
1187 {
1188 1 Byte index;
1189 1 Uint16 chain_index;
1190 1 Uint16 sector_number;
1191 1 Byte id;
1192 1 Uint16 i;
1193 1 Uint16 j;
1194 1 Uint32 cluster;
1195 1 Uint16 temp;
1196 1 Uint32 nb_cluster;
1197 1
1198 1 /*********************/
1199 1 /* Update directory entry */
1200 1 /*********************/
1201 1 fat32_clear_dir_info();
1202 1 fat_dir_current_offs = (fat_current_end_entry_position - 1) * 32;
1203 1 fat32_calc_cluster();
1204 1 fat32_up_down_load_sector(fat_dir_current_sect, UPLOAD);
1205 1 j = ((fat_current_end_entry_position - 1) % 16) * 32 ; /* Position of entry in the sector
- */
1206 1
1207 1 /* Update file size */
1208 1 if (fat_cache.current.size.l <= fat_file_size.l)
1209 1 fat_cache.current.size.l = fat_file_size.l;
1210 1 fat_buf_sector[j + 28] = fat_cache.current.size.b[3];
1211 1 fat_buf_sector[j + 29] = fat_cache.current.size.b[2];
1212 1 fat_buf_sector[j + 30] = fat_cache.current.size.b[1];
1213 1 fat_buf_sector[j + 31] = fat_cache.current.size.b[0];
1214 1
1215 1 ext[0] = fat_buf_sector[j + 8];
1216 1 ext[1] = fat_buf_sector[j + 9];
1217 1 ext[2] = fat_buf_sector[j + 10];
1218 1 id = fat32_check_ext();
1219 1
1220 1 fat32_up_down_load_sector(fat_dir_current_sect, DOWNLOAD);
C51 COMPILER V7.50 FAT32 11/27/2007 20:46:00 PAGE 21
1221 1
1222 1 /********************/
1223 1 /* Update fat 1 & 2 */
1224 1 /********************/
1225 1 /* Calculate file size cluster */
1226 1 nb_cluster = (fat_cache.current.size.l / SECTOR_SIZE) / fat_cluster_si⌨️ 快捷键说明
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