(DA) Internet of Things and Smart Electronics- ELE3006M2122 / Mbed 2 deprecated Final_Project_V19_DLeaming_25574043

Final tidy of code following installation of new sensor, more comments added prior to submission

Dependencies:   mbed

SD_Card/FATFileSystem/MemFileSystem.h@14:3e9991fe64e5, 2022-01-21 (annotated)

Committer:
legstar85
Date:
Fri Jan 21 22:33:32 2022 +0000
Revision:
14:3e9991fe64e5
Addition of new menu option, start of coding for writing Temp data to SD card

Who changed what in which revision?

UserRevisionLine numberNew contents of line
legstar85 14:3e9991fe64e5 1 /* mbed Microcontroller Library - MemFileSystem
legstar85 14:3e9991fe64e5 2 * Copyright (c) 2008, sford
legstar85 14:3e9991fe64e5 3 */
legstar85 14:3e9991fe64e5 4
legstar85 14:3e9991fe64e5 5
legstar85 14:3e9991fe64e5 6 #ifndef MBED_MEMFILESYSTEM_H
legstar85 14:3e9991fe64e5 7 #define MBED_MEMFILESYSTEM_H
legstar85 14:3e9991fe64e5 8
legstar85 14:3e9991fe64e5 9 #include "FATFileSystem.h"
legstar85 14:3e9991fe64e5 10
legstar85 14:3e9991fe64e5 11 namespace mbed
legstar85 14:3e9991fe64e5 12 {
legstar85 14:3e9991fe64e5 13
legstar85 14:3e9991fe64e5 14 class MemFileSystem : public FATFileSystem
legstar85 14:3e9991fe64e5 15 {
legstar85 14:3e9991fe64e5 16 public:
legstar85 14:3e9991fe64e5 17
legstar85 14:3e9991fe64e5 18 // 2000 sectors, each 512 bytes (malloced as required)
legstar85 14:3e9991fe64e5 19 char *sectors[2000];
legstar85 14:3e9991fe64e5 20
legstar85 14:3e9991fe64e5 21 MemFileSystem(const char* name) : FATFileSystem(name) {
legstar85 14:3e9991fe64e5 22 memset(sectors, 0, sizeof(sectors));
legstar85 14:3e9991fe64e5 23 }
legstar85 14:3e9991fe64e5 24
legstar85 14:3e9991fe64e5 25 virtual ~MemFileSystem() {
legstar85 14:3e9991fe64e5 26 for(int i = 0; i < 2000; i++) {
legstar85 14:3e9991fe64e5 27 if(sectors[i]) {
legstar85 14:3e9991fe64e5 28 free(sectors[i]);
legstar85 14:3e9991fe64e5 29 }
legstar85 14:3e9991fe64e5 30 }
legstar85 14:3e9991fe64e5 31 }
legstar85 14:3e9991fe64e5 32
legstar85 14:3e9991fe64e5 33 // read a sector in to the buffer, return 0 if ok
legstar85 14:3e9991fe64e5 34 virtual int disk_read(char *buffer, int sector) {
legstar85 14:3e9991fe64e5 35 if(sectors[sector] == 0) {
legstar85 14:3e9991fe64e5 36 // nothing allocated means sector is empty
legstar85 14:3e9991fe64e5 37 memset(buffer, 0, 512);
legstar85 14:3e9991fe64e5 38 } else {
legstar85 14:3e9991fe64e5 39 memcpy(buffer, sectors[sector], 512);
legstar85 14:3e9991fe64e5 40 }
legstar85 14:3e9991fe64e5 41 return 0;
legstar85 14:3e9991fe64e5 42 }
legstar85 14:3e9991fe64e5 43
legstar85 14:3e9991fe64e5 44 // write a sector from the buffer, return 0 if ok
legstar85 14:3e9991fe64e5 45 virtual int disk_write(const char *buffer, int sector) {
legstar85 14:3e9991fe64e5 46 // if buffer is zero deallocate sector
legstar85 14:3e9991fe64e5 47 char zero[512];
legstar85 14:3e9991fe64e5 48 memset(zero, 0, 512);
legstar85 14:3e9991fe64e5 49 if(memcmp(zero, buffer, 512)==0) {
legstar85 14:3e9991fe64e5 50 if(sectors[sector] != 0) {
legstar85 14:3e9991fe64e5 51 free(sectors[sector]);
legstar85 14:3e9991fe64e5 52 sectors[sector] = 0;
legstar85 14:3e9991fe64e5 53 }
legstar85 14:3e9991fe64e5 54 return 0;
legstar85 14:3e9991fe64e5 55 }
legstar85 14:3e9991fe64e5 56 // else allocate a sector if needed, and write
legstar85 14:3e9991fe64e5 57 if(sectors[sector] == 0) {
legstar85 14:3e9991fe64e5 58 char *sec = (char*)malloc(512);
legstar85 14:3e9991fe64e5 59 if(sec==0) {
legstar85 14:3e9991fe64e5 60 return 1; // out of memory
legstar85 14:3e9991fe64e5 61 }
legstar85 14:3e9991fe64e5 62 sectors[sector] = sec;
legstar85 14:3e9991fe64e5 63 }
legstar85 14:3e9991fe64e5 64 memcpy(sectors[sector], buffer, 512);
legstar85 14:3e9991fe64e5 65 return 0;
legstar85 14:3e9991fe64e5 66 }
legstar85 14:3e9991fe64e5 67
legstar85 14:3e9991fe64e5 68 // return the number of sectors
legstar85 14:3e9991fe64e5 69 virtual int disk_sectors() {
legstar85 14:3e9991fe64e5 70 return sizeof(sectors)/sizeof(sectors[0]);
legstar85 14:3e9991fe64e5 71 }
legstar85 14:3e9991fe64e5 72
legstar85 14:3e9991fe64e5 73 };
legstar85 14:3e9991fe64e5 74
legstar85 14:3e9991fe64e5 75 }
legstar85 14:3e9991fe64e5 76
legstar85 14:3e9991fe64e5 77 #endif