Timóteo Mendes / Mbed 2 deprecated SD_read_write

Example for reading and writing SD card using SPI mode.

Dependencies:   mbed

Fork of Demo_NucleoF4xx_SD_Card by 不韋 呂

SDFileSystem/FATFileSystem/MemFileSystem.h@2:849ac2c01cb1, 2016-12-01 (annotated)

Committer:
Timoteo
Date:
Thu Dec 01 14:09:19 2016 +0000
Revision:
2:849ac2c01cb1
Parent:
0:08b4a59451e5 
mbed error

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:08b4a59451e5 1 /* mbed Microcontroller Library - MemFileSystem
MikamiUitOpen 0:08b4a59451e5 2 * Copyright (c) 2008, sford
MikamiUitOpen 0:08b4a59451e5 3 */
MikamiUitOpen 0:08b4a59451e5 4
MikamiUitOpen 0:08b4a59451e5 5
MikamiUitOpen 0:08b4a59451e5 6 #ifndef MBED_MEMFILESYSTEM_H
MikamiUitOpen 0:08b4a59451e5 7 #define MBED_MEMFILESYSTEM_H
MikamiUitOpen 0:08b4a59451e5 8
MikamiUitOpen 0:08b4a59451e5 9 #include "FATFileSystem.h"
MikamiUitOpen 0:08b4a59451e5 10
MikamiUitOpen 0:08b4a59451e5 11 namespace mbed
MikamiUitOpen 0:08b4a59451e5 12 {
MikamiUitOpen 0:08b4a59451e5 13
MikamiUitOpen 0:08b4a59451e5 14 class MemFileSystem : public FATFileSystem
MikamiUitOpen 0:08b4a59451e5 15 {
MikamiUitOpen 0:08b4a59451e5 16 public:
MikamiUitOpen 0:08b4a59451e5 17
MikamiUitOpen 0:08b4a59451e5 18 // 2000 sectors, each 512 bytes (malloced as required)
MikamiUitOpen 0:08b4a59451e5 19 char *sectors[2000];
MikamiUitOpen 0:08b4a59451e5 20
MikamiUitOpen 0:08b4a59451e5 21 MemFileSystem(const char* name) : FATFileSystem(name) {
MikamiUitOpen 0:08b4a59451e5 22 memset(sectors, 0, sizeof(sectors));
MikamiUitOpen 0:08b4a59451e5 23 }
MikamiUitOpen 0:08b4a59451e5 24
MikamiUitOpen 0:08b4a59451e5 25 virtual ~MemFileSystem() {
MikamiUitOpen 0:08b4a59451e5 26 for(int i = 0; i < 2000; i++) {
MikamiUitOpen 0:08b4a59451e5 27 if(sectors[i]) {
MikamiUitOpen 0:08b4a59451e5 28 free(sectors[i]);
MikamiUitOpen 0:08b4a59451e5 29 }
MikamiUitOpen 0:08b4a59451e5 30 }
MikamiUitOpen 0:08b4a59451e5 31 }
MikamiUitOpen 0:08b4a59451e5 32
MikamiUitOpen 0:08b4a59451e5 33 // read a sector in to the buffer, return 0 if ok
MikamiUitOpen 0:08b4a59451e5 34 virtual int disk_read(char *buffer, int sector) {
MikamiUitOpen 0:08b4a59451e5 35 if(sectors[sector] == 0) {
MikamiUitOpen 0:08b4a59451e5 36 // nothing allocated means sector is empty
MikamiUitOpen 0:08b4a59451e5 37 memset(buffer, 0, 512);
MikamiUitOpen 0:08b4a59451e5 38 } else {
MikamiUitOpen 0:08b4a59451e5 39 memcpy(buffer, sectors[sector], 512);
MikamiUitOpen 0:08b4a59451e5 40 }
MikamiUitOpen 0:08b4a59451e5 41 return 0;
MikamiUitOpen 0:08b4a59451e5 42 }
MikamiUitOpen 0:08b4a59451e5 43
MikamiUitOpen 0:08b4a59451e5 44 // write a sector from the buffer, return 0 if ok
MikamiUitOpen 0:08b4a59451e5 45 virtual int disk_write(const char *buffer, int sector) {
MikamiUitOpen 0:08b4a59451e5 46 // if buffer is zero deallocate sector
MikamiUitOpen 0:08b4a59451e5 47 char zero[512];
MikamiUitOpen 0:08b4a59451e5 48 memset(zero, 0, 512);
MikamiUitOpen 0:08b4a59451e5 49 if(memcmp(zero, buffer, 512)==0) {
MikamiUitOpen 0:08b4a59451e5 50 if(sectors[sector] != 0) {
MikamiUitOpen 0:08b4a59451e5 51 free(sectors[sector]);
MikamiUitOpen 0:08b4a59451e5 52 sectors[sector] = 0;
MikamiUitOpen 0:08b4a59451e5 53 }
MikamiUitOpen 0:08b4a59451e5 54 return 0;
MikamiUitOpen 0:08b4a59451e5 55 }
MikamiUitOpen 0:08b4a59451e5 56 // else allocate a sector if needed, and write
MikamiUitOpen 0:08b4a59451e5 57 if(sectors[sector] == 0) {
MikamiUitOpen 0:08b4a59451e5 58 char *sec = (char*)malloc(512);
MikamiUitOpen 0:08b4a59451e5 59 if(sec==0) {
MikamiUitOpen 0:08b4a59451e5 60 return 1; // out of memory
MikamiUitOpen 0:08b4a59451e5 61 }
MikamiUitOpen 0:08b4a59451e5 62 sectors[sector] = sec;
MikamiUitOpen 0:08b4a59451e5 63 }
MikamiUitOpen 0:08b4a59451e5 64 memcpy(sectors[sector], buffer, 512);
MikamiUitOpen 0:08b4a59451e5 65 return 0;
MikamiUitOpen 0:08b4a59451e5 66 }
MikamiUitOpen 0:08b4a59451e5 67
MikamiUitOpen 0:08b4a59451e5 68 // return the number of sectors
MikamiUitOpen 0:08b4a59451e5 69 virtual int disk_sectors() {
MikamiUitOpen 0:08b4a59451e5 70 return sizeof(sectors)/sizeof(sectors[0]);
MikamiUitOpen 0:08b4a59451e5 71 }
MikamiUitOpen 0:08b4a59451e5 72
MikamiUitOpen 0:08b4a59451e5 73 };
MikamiUitOpen 0:08b4a59451e5 74
MikamiUitOpen 0:08b4a59451e5 75 }
MikamiUitOpen 0:08b4a59451e5 76
MikamiUitOpen 0:08b4a59451e5 77 #endif