Dieter Graef / USBHost_DISCO-F746NG

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Dependents:   DISCO-F746NG_USB_Host

Fork of KL46Z-USBHost by Norimasa Okamoto

FATFileSystem/MemFileSystem.h@25:7d6d9fc471bf, 2016-06-17 (annotated)

Committer:
DieterGraef
Date:
Fri Jun 17 09:00:35 2016 +0000
Revision:
25:7d6d9fc471bf
Parent:
24:5396b6a93262 
USB Host now works with both Interfaces even in parallel. Some changes in the USB MSD driver to make it operable

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 24:5396b6a93262 1 /* mbed Microcontroller Library - MemFileSystem
DieterGraef 24:5396b6a93262 2 * Copyright (c) 2008, sford
DieterGraef 24:5396b6a93262 3 */
DieterGraef 24:5396b6a93262 4
DieterGraef 24:5396b6a93262 5
DieterGraef 24:5396b6a93262 6 #ifndef MBED_MEMFILESYSTEM_H
DieterGraef 24:5396b6a93262 7 #define MBED_MEMFILESYSTEM_H
DieterGraef 24:5396b6a93262 8
DieterGraef 24:5396b6a93262 9 #include "FATFileSystem.h"
DieterGraef 24:5396b6a93262 10
DieterGraef 24:5396b6a93262 11 namespace mbed
DieterGraef 24:5396b6a93262 12 {
DieterGraef 24:5396b6a93262 13
DieterGraef 24:5396b6a93262 14 class MemFileSystem : public FATFileSystem
DieterGraef 24:5396b6a93262 15 {
DieterGraef 24:5396b6a93262 16 public:
DieterGraef 24:5396b6a93262 17
DieterGraef 24:5396b6a93262 18 // 2000 sectors, each 512 bytes (malloced as required)
DieterGraef 24:5396b6a93262 19 char *sectors[2000];
DieterGraef 24:5396b6a93262 20
DieterGraef 24:5396b6a93262 21 MemFileSystem(const char* name) : FATFileSystem(name) {
DieterGraef 24:5396b6a93262 22 memset(sectors, 0, sizeof(sectors));
DieterGraef 24:5396b6a93262 23 }
DieterGraef 24:5396b6a93262 24
DieterGraef 24:5396b6a93262 25 virtual ~MemFileSystem() {
DieterGraef 24:5396b6a93262 26 for(int i = 0; i < 2000; i++) {
DieterGraef 24:5396b6a93262 27 if(sectors[i]) {
DieterGraef 24:5396b6a93262 28 free(sectors[i]);
DieterGraef 24:5396b6a93262 29 }
DieterGraef 24:5396b6a93262 30 }
DieterGraef 24:5396b6a93262 31 }
DieterGraef 24:5396b6a93262 32
DieterGraef 24:5396b6a93262 33 // read a sector in to the buffer, return 0 if ok
DieterGraef 24:5396b6a93262 34 virtual int disk_read(char *buffer, int sector) {
DieterGraef 24:5396b6a93262 35 if(sectors[sector] == 0) {
DieterGraef 24:5396b6a93262 36 // nothing allocated means sector is empty
DieterGraef 24:5396b6a93262 37 memset(buffer, 0, 512);
DieterGraef 24:5396b6a93262 38 } else {
DieterGraef 24:5396b6a93262 39 memcpy(buffer, sectors[sector], 512);
DieterGraef 24:5396b6a93262 40 }
DieterGraef 24:5396b6a93262 41 return 0;
DieterGraef 24:5396b6a93262 42 }
DieterGraef 24:5396b6a93262 43
DieterGraef 24:5396b6a93262 44 // write a sector from the buffer, return 0 if ok
DieterGraef 24:5396b6a93262 45 virtual int disk_write(const char *buffer, int sector) {
DieterGraef 24:5396b6a93262 46 // if buffer is zero deallocate sector
DieterGraef 24:5396b6a93262 47 char zero[512];
DieterGraef 24:5396b6a93262 48 memset(zero, 0, 512);
DieterGraef 24:5396b6a93262 49 if(memcmp(zero, buffer, 512)==0) {
DieterGraef 24:5396b6a93262 50 if(sectors[sector] != 0) {
DieterGraef 24:5396b6a93262 51 free(sectors[sector]);
DieterGraef 24:5396b6a93262 52 sectors[sector] = 0;
DieterGraef 24:5396b6a93262 53 }
DieterGraef 24:5396b6a93262 54 return 0;
DieterGraef 24:5396b6a93262 55 }
DieterGraef 24:5396b6a93262 56 // else allocate a sector if needed, and write
DieterGraef 24:5396b6a93262 57 if(sectors[sector] == 0) {
DieterGraef 24:5396b6a93262 58 char *sec = (char*)malloc(512);
DieterGraef 24:5396b6a93262 59 if(sec==0) {
DieterGraef 24:5396b6a93262 60 return 1; // out of memory
DieterGraef 24:5396b6a93262 61 }
DieterGraef 24:5396b6a93262 62 sectors[sector] = sec;
DieterGraef 24:5396b6a93262 63 }
DieterGraef 24:5396b6a93262 64 memcpy(sectors[sector], buffer, 512);
DieterGraef 24:5396b6a93262 65 return 0;
DieterGraef 24:5396b6a93262 66 }
DieterGraef 24:5396b6a93262 67
DieterGraef 24:5396b6a93262 68 // return the number of sectors
DieterGraef 24:5396b6a93262 69 virtual int disk_sectors() {
DieterGraef 24:5396b6a93262 70 return sizeof(sectors)/sizeof(sectors[0]);
DieterGraef 24:5396b6a93262 71 }
DieterGraef 24:5396b6a93262 72
DieterGraef 24:5396b6a93262 73 };
DieterGraef 24:5396b6a93262 74
DieterGraef 24:5396b6a93262 75 }
DieterGraef 24:5396b6a93262 76
DieterGraef 24:5396b6a93262 77 #endif