伊生希 小林 / Mbed 2 deprecated cansat_main_copy

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Dependencies:   mbed SDFileSystem MS5607 ADXL345_I2C FATFileSystem

SDFileSystem/FATFileSystem/MemFileSystem.h@0:c88c3b616c00, 2020-03-16 (annotated)

Committer:
IKobayashi
Date:
Mon Mar 16 23:37:42 2020 +0900
Revision:
0:c88c3b616c00
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
IKobayashi 0:c88c3b616c00 1 /* mbed Microcontroller Library - MemFileSystem
IKobayashi 0:c88c3b616c00 2 * Copyright (c) 2008, sford
IKobayashi 0:c88c3b616c00 3 */
IKobayashi 0:c88c3b616c00 4
IKobayashi 0:c88c3b616c00 5
IKobayashi 0:c88c3b616c00 6 #ifndef MBED_MEMFILESYSTEM_H
IKobayashi 0:c88c3b616c00 7 #define MBED_MEMFILESYSTEM_H
IKobayashi 0:c88c3b616c00 8
IKobayashi 0:c88c3b616c00 9 #include "FATFileSystem.h"
IKobayashi 0:c88c3b616c00 10
IKobayashi 0:c88c3b616c00 11 namespace mbed
IKobayashi 0:c88c3b616c00 12 {
IKobayashi 0:c88c3b616c00 13
IKobayashi 0:c88c3b616c00 14 class MemFileSystem : public FATFileSystem
IKobayashi 0:c88c3b616c00 15 {
IKobayashi 0:c88c3b616c00 16 public:
IKobayashi 0:c88c3b616c00 17
IKobayashi 0:c88c3b616c00 18 // 2000 sectors, each 512 bytes (malloced as required)
IKobayashi 0:c88c3b616c00 19 char *sectors[2000];
IKobayashi 0:c88c3b616c00 20
IKobayashi 0:c88c3b616c00 21 MemFileSystem(const char* name) : FATFileSystem(name) {
IKobayashi 0:c88c3b616c00 22 memset(sectors, 0, sizeof(sectors));
IKobayashi 0:c88c3b616c00 23 }
IKobayashi 0:c88c3b616c00 24
IKobayashi 0:c88c3b616c00 25 virtual ~MemFileSystem() {
IKobayashi 0:c88c3b616c00 26 for(int i = 0; i < 2000; i++) {
IKobayashi 0:c88c3b616c00 27 if(sectors[i]) {
IKobayashi 0:c88c3b616c00 28 free(sectors[i]);
IKobayashi 0:c88c3b616c00 29 }
IKobayashi 0:c88c3b616c00 30 }
IKobayashi 0:c88c3b616c00 31 }
IKobayashi 0:c88c3b616c00 32
IKobayashi 0:c88c3b616c00 33 // read a sector in to the buffer, return 0 if ok
IKobayashi 0:c88c3b616c00 34 virtual int disk_read(char *buffer, int sector) {
IKobayashi 0:c88c3b616c00 35 if(sectors[sector] == 0) {
IKobayashi 0:c88c3b616c00 36 // nothing allocated means sector is empty
IKobayashi 0:c88c3b616c00 37 memset(buffer, 0, 512);
IKobayashi 0:c88c3b616c00 38 } else {
IKobayashi 0:c88c3b616c00 39 memcpy(buffer, sectors[sector], 512);
IKobayashi 0:c88c3b616c00 40 }
IKobayashi 0:c88c3b616c00 41 return 0;
IKobayashi 0:c88c3b616c00 42 }
IKobayashi 0:c88c3b616c00 43
IKobayashi 0:c88c3b616c00 44 // write a sector from the buffer, return 0 if ok
IKobayashi 0:c88c3b616c00 45 virtual int disk_write(const char *buffer, int sector) {
IKobayashi 0:c88c3b616c00 46 // if buffer is zero deallocate sector
IKobayashi 0:c88c3b616c00 47 char zero[512];
IKobayashi 0:c88c3b616c00 48 memset(zero, 0, 512);
IKobayashi 0:c88c3b616c00 49 if(memcmp(zero, buffer, 512)==0) {
IKobayashi 0:c88c3b616c00 50 if(sectors[sector] != 0) {
IKobayashi 0:c88c3b616c00 51 free(sectors[sector]);
IKobayashi 0:c88c3b616c00 52 sectors[sector] = 0;
IKobayashi 0:c88c3b616c00 53 }
IKobayashi 0:c88c3b616c00 54 return 0;
IKobayashi 0:c88c3b616c00 55 }
IKobayashi 0:c88c3b616c00 56 // else allocate a sector if needed, and write
IKobayashi 0:c88c3b616c00 57 if(sectors[sector] == 0) {
IKobayashi 0:c88c3b616c00 58 char *sec = (char*)malloc(512);
IKobayashi 0:c88c3b616c00 59 if(sec==0) {
IKobayashi 0:c88c3b616c00 60 return 1; // out of memory
IKobayashi 0:c88c3b616c00 61 }
IKobayashi 0:c88c3b616c00 62 sectors[sector] = sec;
IKobayashi 0:c88c3b616c00 63 }
IKobayashi 0:c88c3b616c00 64 memcpy(sectors[sector], buffer, 512);
IKobayashi 0:c88c3b616c00 65 return 0;
IKobayashi 0:c88c3b616c00 66 }
IKobayashi 0:c88c3b616c00 67
IKobayashi 0:c88c3b616c00 68 // return the number of sectors
IKobayashi 0:c88c3b616c00 69 virtual int disk_sectors() {
IKobayashi 0:c88c3b616c00 70 return sizeof(sectors)/sizeof(sectors[0]);
IKobayashi 0:c88c3b616c00 71 }
IKobayashi 0:c88c3b616c00 72
IKobayashi 0:c88c3b616c00 73 };
IKobayashi 0:c88c3b616c00 74
IKobayashi 0:c88c3b616c00 75 }
IKobayashi 0:c88c3b616c00 76
IKobayashi 0:c88c3b616c00 77 #endif