John Mitchell / DMSupport

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Dependencies:   DM_FATFileSystem DM_HttpServer DM_USBHost EthernetInterface USBDevice mbed-rpc mbed-rtos mbed-src

Dependents:   lpc4088_displaymodule_hello_world_Sept_2018

Fork of DMSupport by Embedded Artists

FileSystems/RAMFileSystem.cpp@9:a33326afd686, 2014-12-11 (annotated)

Committer:
embeddedartists
Date:
Thu Dec 11 18:23:07 2014 +0000
Revision:
9:a33326afd686
Parent:
0:6b68dac0d986
Child:
34:fc366bab393f
Updated documentation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 9:a33326afd686 1 /*
embeddedartists 9:a33326afd686 2 * Copyright 2014 Embedded Artists AB
embeddedartists 9:a33326afd686 3 *
embeddedartists 9:a33326afd686 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 9:a33326afd686 5 * you may not use this file except in compliance with the License.
embeddedartists 9:a33326afd686 6 * You may obtain a copy of the License at
embeddedartists 9:a33326afd686 7 *
embeddedartists 9:a33326afd686 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 9:a33326afd686 9 *
embeddedartists 9:a33326afd686 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 9:a33326afd686 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 9:a33326afd686 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 9:a33326afd686 13 * See the License for the specific language governing permissions and
embeddedartists 9:a33326afd686 14 * limitations under the License.
embeddedartists 9:a33326afd686 15 */
embeddedartists 9:a33326afd686 16
embeddedartists 0:6b68dac0d986 17 #include "RAMFileSystem.h"
embeddedartists 0:6b68dac0d986 18 #include "mbed_debug.h"
embeddedartists 0:6b68dac0d986 19
embeddedartists 0:6b68dac0d986 20 #define RAMFS_DBG 0
embeddedartists 0:6b68dac0d986 21
embeddedartists 0:6b68dac0d986 22 #define SECTOR_SIZE 512
embeddedartists 0:6b68dac0d986 23
embeddedartists 0:6b68dac0d986 24 RAMFileSystem::RAMFileSystem(uint32_t addr, uint32_t size, const char* name) :
embeddedartists 0:6b68dac0d986 25 FATFileSystem(name) {
embeddedartists 0:6b68dac0d986 26 memStart = addr;
embeddedartists 0:6b68dac0d986 27 memSize = size - (size % SECTOR_SIZE);
embeddedartists 0:6b68dac0d986 28 status = 1; //1: disk not initialized
embeddedartists 0:6b68dac0d986 29 }
embeddedartists 0:6b68dac0d986 30
embeddedartists 0:6b68dac0d986 31 int RAMFileSystem::disk_initialize() {
embeddedartists 0:6b68dac0d986 32 debug_if(RAMFS_DBG, "init RAM fs\n");
embeddedartists 0:6b68dac0d986 33 status = 0; //OK
embeddedartists 0:6b68dac0d986 34 return status;
embeddedartists 0:6b68dac0d986 35 }
embeddedartists 0:6b68dac0d986 36
embeddedartists 0:6b68dac0d986 37 int RAMFileSystem::disk_write(const uint8_t *buffer, uint64_t sector, uint8_t count) {
embeddedartists 0:6b68dac0d986 38 debug_if(RAMFS_DBG, "write to sector(s) %llu..%llu\n", sector, sector+count);
embeddedartists 0:6b68dac0d986 39 if ((sector+count-1) >= disk_sectors()) {
embeddedartists 0:6b68dac0d986 40 return 1;
embeddedartists 0:6b68dac0d986 41 }
embeddedartists 0:6b68dac0d986 42
embeddedartists 0:6b68dac0d986 43 memcpy((uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), buffer, SECTOR_SIZE*count);
embeddedartists 0:6b68dac0d986 44 return 0;
embeddedartists 0:6b68dac0d986 45 }
embeddedartists 0:6b68dac0d986 46
embeddedartists 0:6b68dac0d986 47 int RAMFileSystem::disk_read(uint8_t *buffer, uint64_t sector, uint8_t count) {
embeddedartists 0:6b68dac0d986 48 debug_if(RAMFS_DBG, "read from sector(s) %llu..%llu\n", sector, sector+count);
embeddedartists 0:6b68dac0d986 49 if ((sector+count-1) >= disk_sectors()) {
embeddedartists 0:6b68dac0d986 50 return 1;
embeddedartists 0:6b68dac0d986 51 }
embeddedartists 0:6b68dac0d986 52
embeddedartists 0:6b68dac0d986 53 memcpy(buffer, (uint8_t*)(memStart + SECTOR_SIZE*((uint32_t)sector)), SECTOR_SIZE*count);
embeddedartists 0:6b68dac0d986 54 return 0;
embeddedartists 0:6b68dac0d986 55 }
embeddedartists 0:6b68dac0d986 56
embeddedartists 0:6b68dac0d986 57 int RAMFileSystem::disk_status() {
embeddedartists 0:6b68dac0d986 58 debug_if(RAMFS_DBG, "disk status %d\n", status);
embeddedartists 0:6b68dac0d986 59 return status;
embeddedartists 0:6b68dac0d986 60 }
embeddedartists 0:6b68dac0d986 61 int RAMFileSystem::disk_sync() {
embeddedartists 0:6b68dac0d986 62 return 0;
embeddedartists 0:6b68dac0d986 63 }
embeddedartists 0:6b68dac0d986 64 uint64_t RAMFileSystem::disk_sectors() {
embeddedartists 0:6b68dac0d986 65 debug_if(RAMFS_DBG, "returning fs has %u sectors\n", memSize/SECTOR_SIZE);
embeddedartists 0:6b68dac0d986 66 return memSize/SECTOR_SIZE;
embeddedartists 0:6b68dac0d986 67 }
embeddedartists 0:6b68dac0d986 68
embeddedartists 0:6b68dac0d986 69 uint64_t RAMFileSystem::disk_size() {
embeddedartists 0:6b68dac0d986 70 return memSize;
embeddedartists 0:6b68dac0d986 71 }