inisat_dev / Mbed 2 deprecated inisat4nucleo

Dependencies:   mbed Servo

SDFileSystem/MemFileSystem.h@4:34a8e94c6fd5, 2020-10-27 (annotated)

Committer:
eric11fr
Date:
Tue Oct 27 22:22:14 2020 +0000
Revision:
4:34a8e94c6fd5
Parent:
0:b8bade04f24f 
test menu via xbee

Who changed what in which revision?

UserRevisionLine numberNew contents of line
eric11fr 0:b8bade04f24f 1 /* mbed Microcontroller Library - MemFileSystem
eric11fr 0:b8bade04f24f 2 * Copyright (c) 2008, sford
eric11fr 0:b8bade04f24f 3 */
eric11fr 0:b8bade04f24f 4
eric11fr 0:b8bade04f24f 5
eric11fr 0:b8bade04f24f 6 #ifndef MBED_MEMFILESYSTEM_H
eric11fr 0:b8bade04f24f 7 #define MBED_MEMFILESYSTEM_H
eric11fr 0:b8bade04f24f 8
eric11fr 0:b8bade04f24f 9 #include "FATFileSystem.h"
eric11fr 0:b8bade04f24f 10
eric11fr 0:b8bade04f24f 11 namespace mbed
eric11fr 0:b8bade04f24f 12 {
eric11fr 0:b8bade04f24f 13
eric11fr 0:b8bade04f24f 14 class MemFileSystem : public FATFileSystem
eric11fr 0:b8bade04f24f 15 {
eric11fr 0:b8bade04f24f 16 public:
eric11fr 0:b8bade04f24f 17
eric11fr 0:b8bade04f24f 18 // 2000 sectors, each 512 bytes (malloced as required)
eric11fr 0:b8bade04f24f 19 char *sectors[2000];
eric11fr 0:b8bade04f24f 20
eric11fr 0:b8bade04f24f 21 MemFileSystem(const char* name) : FATFileSystem(name) {
eric11fr 0:b8bade04f24f 22 memset(sectors, 0, sizeof(sectors));
eric11fr 0:b8bade04f24f 23 }
eric11fr 0:b8bade04f24f 24
eric11fr 0:b8bade04f24f 25 virtual ~MemFileSystem() {
eric11fr 0:b8bade04f24f 26 for(int i = 0; i < 2000; i++) {
eric11fr 0:b8bade04f24f 27 if(sectors[i]) {
eric11fr 0:b8bade04f24f 28 free(sectors[i]);
eric11fr 0:b8bade04f24f 29 }
eric11fr 0:b8bade04f24f 30 }
eric11fr 0:b8bade04f24f 31 }
eric11fr 0:b8bade04f24f 32
eric11fr 0:b8bade04f24f 33 // read a sector in to the buffer, return 0 if ok
eric11fr 0:b8bade04f24f 34 virtual int disk_read(char *buffer, int sector) {
eric11fr 0:b8bade04f24f 35 if(sectors[sector] == 0) {
eric11fr 0:b8bade04f24f 36 // nothing allocated means sector is empty
eric11fr 0:b8bade04f24f 37 memset(buffer, 0, 512);
eric11fr 0:b8bade04f24f 38 } else {
eric11fr 0:b8bade04f24f 39 memcpy(buffer, sectors[sector], 512);
eric11fr 0:b8bade04f24f 40 }
eric11fr 0:b8bade04f24f 41 return 0;
eric11fr 0:b8bade04f24f 42 }
eric11fr 0:b8bade04f24f 43
eric11fr 0:b8bade04f24f 44 // write a sector from the buffer, return 0 if ok
eric11fr 0:b8bade04f24f 45 virtual int disk_write(const char *buffer, int sector) {
eric11fr 0:b8bade04f24f 46 // if buffer is zero deallocate sector
eric11fr 0:b8bade04f24f 47 char zero[512];
eric11fr 0:b8bade04f24f 48 memset(zero, 0, 512);
eric11fr 0:b8bade04f24f 49 if(memcmp(zero, buffer, 512)==0) {
eric11fr 0:b8bade04f24f 50 if(sectors[sector] != 0) {
eric11fr 0:b8bade04f24f 51 free(sectors[sector]);
eric11fr 0:b8bade04f24f 52 sectors[sector] = 0;
eric11fr 0:b8bade04f24f 53 }
eric11fr 0:b8bade04f24f 54 return 0;
eric11fr 0:b8bade04f24f 55 }
eric11fr 0:b8bade04f24f 56 // else allocate a sector if needed, and write
eric11fr 0:b8bade04f24f 57 if(sectors[sector] == 0) {
eric11fr 0:b8bade04f24f 58 char *sec = (char*)malloc(512);
eric11fr 0:b8bade04f24f 59 if(sec==0) {
eric11fr 0:b8bade04f24f 60 return 1; // out of memory
eric11fr 0:b8bade04f24f 61 }
eric11fr 0:b8bade04f24f 62 sectors[sector] = sec;
eric11fr 0:b8bade04f24f 63 }
eric11fr 0:b8bade04f24f 64 memcpy(sectors[sector], buffer, 512);
eric11fr 0:b8bade04f24f 65 return 0;
eric11fr 0:b8bade04f24f 66 }
eric11fr 0:b8bade04f24f 67
eric11fr 0:b8bade04f24f 68 // return the number of sectors
eric11fr 0:b8bade04f24f 69 virtual int disk_sectors() {
eric11fr 0:b8bade04f24f 70 return sizeof(sectors)/sizeof(sectors[0]);
eric11fr 0:b8bade04f24f 71 }
eric11fr 0:b8bade04f24f 72
eric11fr 0:b8bade04f24f 73 };
eric11fr 0:b8bade04f24f 74
eric11fr 0:b8bade04f24f 75 }
eric11fr 0:b8bade04f24f 76
eric11fr 0:b8bade04f24f 77 #endif