Pierre Provent / USBHost

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Dependents:   TEST_USB_Nucleo_F429ZI Essais_USB_Nucleo_F429ZI SID_V3_Nucleo_F429ZI SID_V4_Nucleo_F429ZI_copy

FATFileSystem/MemFileSystem.h@0:77ca32e8e04e, 2020-09-25 (annotated)

Committer:
pierreprovent
Date:
Fri Sep 25 10:17:49 2020 +0000
Revision:
0:77ca32e8e04e
Programme acquisition en enregistrement sur clef USB carte Nucleo F429ZI cours ELE118 Cnam

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pierreprovent 0:77ca32e8e04e 1 /* mbed Microcontroller Library - MemFileSystem
pierreprovent 0:77ca32e8e04e 2 * Copyright (c) 2008, sford
pierreprovent 0:77ca32e8e04e 3 */
pierreprovent 0:77ca32e8e04e 4
pierreprovent 0:77ca32e8e04e 5
pierreprovent 0:77ca32e8e04e 6 #ifndef MBED_MEMFILESYSTEM_H
pierreprovent 0:77ca32e8e04e 7 #define MBED_MEMFILESYSTEM_H
pierreprovent 0:77ca32e8e04e 8
pierreprovent 0:77ca32e8e04e 9 #include "FATFileSystem.h"
pierreprovent 0:77ca32e8e04e 10
pierreprovent 0:77ca32e8e04e 11 namespace mbed
pierreprovent 0:77ca32e8e04e 12 {
pierreprovent 0:77ca32e8e04e 13
pierreprovent 0:77ca32e8e04e 14 class MemFileSystem : public FATFileSystem
pierreprovent 0:77ca32e8e04e 15 {
pierreprovent 0:77ca32e8e04e 16 public:
pierreprovent 0:77ca32e8e04e 17
pierreprovent 0:77ca32e8e04e 18 // 2000 sectors, each 512 bytes (malloced as required)
pierreprovent 0:77ca32e8e04e 19 char *sectors[2000];
pierreprovent 0:77ca32e8e04e 20
pierreprovent 0:77ca32e8e04e 21 MemFileSystem(const char* name) : FATFileSystem(name) {
pierreprovent 0:77ca32e8e04e 22 memset(sectors, 0, sizeof(sectors));
pierreprovent 0:77ca32e8e04e 23 }
pierreprovent 0:77ca32e8e04e 24
pierreprovent 0:77ca32e8e04e 25 virtual ~MemFileSystem() {
pierreprovent 0:77ca32e8e04e 26 for(int i = 0; i < 2000; i++) {
pierreprovent 0:77ca32e8e04e 27 if(sectors[i]) {
pierreprovent 0:77ca32e8e04e 28 free(sectors[i]);
pierreprovent 0:77ca32e8e04e 29 }
pierreprovent 0:77ca32e8e04e 30 }
pierreprovent 0:77ca32e8e04e 31 }
pierreprovent 0:77ca32e8e04e 32
pierreprovent 0:77ca32e8e04e 33 // read a sector in to the buffer, return 0 if ok
pierreprovent 0:77ca32e8e04e 34 virtual int disk_read(char *buffer, int sector) {
pierreprovent 0:77ca32e8e04e 35 if(sectors[sector] == 0) {
pierreprovent 0:77ca32e8e04e 36 // nothing allocated means sector is empty
pierreprovent 0:77ca32e8e04e 37 memset(buffer, 0, 512);
pierreprovent 0:77ca32e8e04e 38 } else {
pierreprovent 0:77ca32e8e04e 39 memcpy(buffer, sectors[sector], 512);
pierreprovent 0:77ca32e8e04e 40 }
pierreprovent 0:77ca32e8e04e 41 return 0;
pierreprovent 0:77ca32e8e04e 42 }
pierreprovent 0:77ca32e8e04e 43
pierreprovent 0:77ca32e8e04e 44 // write a sector from the buffer, return 0 if ok
pierreprovent 0:77ca32e8e04e 45 virtual int disk_write(const char *buffer, int sector) {
pierreprovent 0:77ca32e8e04e 46 // if buffer is zero deallocate sector
pierreprovent 0:77ca32e8e04e 47 char zero[512];
pierreprovent 0:77ca32e8e04e 48 memset(zero, 0, 512);
pierreprovent 0:77ca32e8e04e 49 if(memcmp(zero, buffer, 512)==0) {
pierreprovent 0:77ca32e8e04e 50 if(sectors[sector] != 0) {
pierreprovent 0:77ca32e8e04e 51 free(sectors[sector]);
pierreprovent 0:77ca32e8e04e 52 sectors[sector] = 0;
pierreprovent 0:77ca32e8e04e 53 }
pierreprovent 0:77ca32e8e04e 54 return 0;
pierreprovent 0:77ca32e8e04e 55 }
pierreprovent 0:77ca32e8e04e 56 // else allocate a sector if needed, and write
pierreprovent 0:77ca32e8e04e 57 if(sectors[sector] == 0) {
pierreprovent 0:77ca32e8e04e 58 char *sec = (char*)malloc(512);
pierreprovent 0:77ca32e8e04e 59 if(sec==0) {
pierreprovent 0:77ca32e8e04e 60 return 1; // out of memory
pierreprovent 0:77ca32e8e04e 61 }
pierreprovent 0:77ca32e8e04e 62 sectors[sector] = sec;
pierreprovent 0:77ca32e8e04e 63 }
pierreprovent 0:77ca32e8e04e 64 memcpy(sectors[sector], buffer, 512);
pierreprovent 0:77ca32e8e04e 65 return 0;
pierreprovent 0:77ca32e8e04e 66 }
pierreprovent 0:77ca32e8e04e 67
pierreprovent 0:77ca32e8e04e 68 // return the number of sectors
pierreprovent 0:77ca32e8e04e 69 virtual int disk_sectors() {
pierreprovent 0:77ca32e8e04e 70 return sizeof(sectors)/sizeof(sectors[0]);
pierreprovent 0:77ca32e8e04e 71 }
pierreprovent 0:77ca32e8e04e 72
pierreprovent 0:77ca32e8e04e 73 };
pierreprovent 0:77ca32e8e04e 74
pierreprovent 0:77ca32e8e04e 75 }
pierreprovent 0:77ca32e8e04e 76
pierreprovent 0:77ca32e8e04e 77 #endif