james kain / Mbed 2 deprecated GPS_Incremental

JEK changes enabling proper recording of IMU/GPS datastrams - 02-APR-2013

Dependencies:   mbed

Fork of GPS_Incremental by Dan Matthews

FatFileSystem/MemFileSystem.h@9:b45feb91ba38, 2013-04-19 (annotated)

Committer:
jekain314
Date:
Fri Apr 19 16:21:27 2013 +0000
Revision:
9:b45feb91ba38
Parent:
0:c746ee34feae 
update to allow better imu gps data collection

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dannyman939 0:c746ee34feae 1 /* mbed Microcontroller Library - MemFileSystem
dannyman939 0:c746ee34feae 2 * Copyright (c) 2008, sford
dannyman939 0:c746ee34feae 3 */
dannyman939 0:c746ee34feae 4
dannyman939 0:c746ee34feae 5
dannyman939 0:c746ee34feae 6 #ifndef MBED_MEMFILESYSTEM_H
dannyman939 0:c746ee34feae 7 #define MBED_MEMFILESYSTEM_H
dannyman939 0:c746ee34feae 8
dannyman939 0:c746ee34feae 9 #include "FATFileSystem.h"
dannyman939 0:c746ee34feae 10
dannyman939 0:c746ee34feae 11 namespace mbed {
dannyman939 0:c746ee34feae 12
dannyman939 0:c746ee34feae 13 class MemFileSystem : public FATFileSystem {
dannyman939 0:c746ee34feae 14 public:
dannyman939 0:c746ee34feae 15
dannyman939 0:c746ee34feae 16 // 2000 sectors, each 512 bytes (malloced as required)
dannyman939 0:c746ee34feae 17 char *sectors[2000];
dannyman939 0:c746ee34feae 18
dannyman939 0:c746ee34feae 19 MemFileSystem(const char* name) : FATFileSystem(name) {
dannyman939 0:c746ee34feae 20 memset(sectors, 0, sizeof(sectors));
dannyman939 0:c746ee34feae 21 }
dannyman939 0:c746ee34feae 22
dannyman939 0:c746ee34feae 23 virtual ~MemFileSystem() {
dannyman939 0:c746ee34feae 24 for(int i = 0; i < 2000; i++) {
dannyman939 0:c746ee34feae 25 if(sectors[i]) {
dannyman939 0:c746ee34feae 26 free(sectors[i]);
dannyman939 0:c746ee34feae 27 }
dannyman939 0:c746ee34feae 28 }
dannyman939 0:c746ee34feae 29 }
dannyman939 0:c746ee34feae 30
dannyman939 0:c746ee34feae 31 // read a sector in to the buffer, return 0 if ok
dannyman939 0:c746ee34feae 32 virtual int disk_read(char *buffer, int sector) {
dannyman939 0:c746ee34feae 33 if(sectors[sector] == 0) {
dannyman939 0:c746ee34feae 34 // nothing allocated means sector is empty
dannyman939 0:c746ee34feae 35 memset(buffer, 0, 512);
dannyman939 0:c746ee34feae 36 } else {
dannyman939 0:c746ee34feae 37 memcpy(buffer, sectors[sector], 512);
dannyman939 0:c746ee34feae 38 }
dannyman939 0:c746ee34feae 39 return 0;
dannyman939 0:c746ee34feae 40 }
dannyman939 0:c746ee34feae 41
dannyman939 0:c746ee34feae 42 // write a sector from the buffer, return 0 if ok
dannyman939 0:c746ee34feae 43 virtual int disk_write(const char *buffer, int sector) {
dannyman939 0:c746ee34feae 44 // if buffer is zero deallocate sector
dannyman939 0:c746ee34feae 45 char zero[512];
dannyman939 0:c746ee34feae 46 memset(zero, 0, 512);
dannyman939 0:c746ee34feae 47 if(memcmp(zero, buffer, 512)==0) {
dannyman939 0:c746ee34feae 48 if(sectors[sector] != 0) {
dannyman939 0:c746ee34feae 49 free(sectors[sector]);
dannyman939 0:c746ee34feae 50 sectors[sector] = 0;
dannyman939 0:c746ee34feae 51 }
dannyman939 0:c746ee34feae 52 return 0;
dannyman939 0:c746ee34feae 53 }
dannyman939 0:c746ee34feae 54 // else allocate a sector if needed, and write
dannyman939 0:c746ee34feae 55 if(sectors[sector] == 0) {
dannyman939 0:c746ee34feae 56 char *sec = (char*)malloc(512);
dannyman939 0:c746ee34feae 57 if(sec==0) {
dannyman939 0:c746ee34feae 58 return 1; // out of memory
dannyman939 0:c746ee34feae 59 }
dannyman939 0:c746ee34feae 60 sectors[sector] = sec;
dannyman939 0:c746ee34feae 61 }
dannyman939 0:c746ee34feae 62 memcpy(sectors[sector], buffer, 512);
dannyman939 0:c746ee34feae 63 return 0;
dannyman939 0:c746ee34feae 64 }
dannyman939 0:c746ee34feae 65
dannyman939 0:c746ee34feae 66 // return the number of sectors
dannyman939 0:c746ee34feae 67 virtual int disk_sectors() {
dannyman939 0:c746ee34feae 68 return sizeof(sectors)/sizeof(sectors[0]);
dannyman939 0:c746ee34feae 69 }
dannyman939 0:c746ee34feae 70
dannyman939 0:c746ee34feae 71 };
dannyman939 0:c746ee34feae 72
dannyman939 0:c746ee34feae 73 }
dannyman939 0:c746ee34feae 74
dannyman939 0:c746ee34feae 75 #endif