Michael Ling / SDFileSystem_HelloWorld

SDFileSystem, slightly modified for the ExoController

Dependencies:   SDFileSystem

Dependents:   Data-Management-Honka

Fork of SDFileSystem_HelloWorld by Bradley Perry

SDFile.cpp@2:ec4d7e5fa68e, 2014-12-17 (annotated)

Committer:
mzling
Date:
Wed Dec 17 21:43:42 2014 +0000
Revision:
2:ec4d7e5fa68e
Child:
3:8f5903a77a13
Created library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mzling 2:ec4d7e5fa68e 1 #include "mbed.h"
mzling 2:ec4d7e5fa68e 2 #include "SDFileSystem.h"
mzling 2:ec4d7e5fa68e 3 #include "SDFile.h"
mzling 2:ec4d7e5fa68e 4 #include "errno.h"
mzling 2:ec4d7e5fa68e 5
mzling 2:ec4d7e5fa68e 6
mzling 2:ec4d7e5fa68e 7 SDFile::SDFile(string path, string filename) {
mzling 2:ec4d7e5fa68e 8 //Creates the necessary directory
mzling 2:ec4d7e5fa68e 9 char *a=new char[path.size()+1];
mzling 2:ec4d7e5fa68e 10 a[path.size()]=0;
mzling 2:ec4d7e5fa68e 11 memcpy(a,path.c_str(),path.size());
mzling 2:ec4d7e5fa68e 12 int dir = mkdir((const char *)a, 0777);
mzling 2:ec4d7e5fa68e 13 //Calculates the full filename, then creates the file
mzling 2:ec4d7e5fa68e 14 std::string fullname = path + filename;
mzling 2:ec4d7e5fa68e 15
mzling 2:ec4d7e5fa68e 16 char *b=new char[filename.size()+1];
mzling 2:ec4d7e5fa68e 17 b[filename.size()]=0;
mzling 2:ec4d7e5fa68e 18 memcpy(b,filename.c_str(),filename.size());
mzling 2:ec4d7e5fa68e 19 fp = fopen((const char*)b, "w+");
mzling 2:ec4d7e5fa68e 20
mzling 2:ec4d7e5fa68e 21
mzling 2:ec4d7e5fa68e 22 }
mzling 2:ec4d7e5fa68e 23
mzling 2:ec4d7e5fa68e 24 //Reads from the file pointed to by FP to an array
mzling 2:ec4d7e5fa68e 25 int* SDFile::read(int *array, int length) {
mzling 2:ec4d7e5fa68e 26
mzling 2:ec4d7e5fa68e 27 //shift to the end of the file and go back accounting for the commas, spaces, \n, and \r (6 places per data)
mzling 2:ec4d7e5fa68e 28 fseek(fp, -6*length, SEEK_END);
mzling 2:ec4d7e5fa68e 29 //cycle through the length of the vector and read the values.
mzling 2:ec4d7e5fa68e 30 for(int i=0; i<length; i++) {
mzling 2:ec4d7e5fa68e 31 fscanf(fp, "%x, ", &array[i]);
mzling 2:ec4d7e5fa68e 32 }
mzling 2:ec4d7e5fa68e 33
mzling 2:ec4d7e5fa68e 34 return array;
mzling 2:ec4d7e5fa68e 35 }
mzling 2:ec4d7e5fa68e 36
mzling 2:ec4d7e5fa68e 37 //writes from an array to the file pointed to by fp
mzling 2:ec4d7e5fa68e 38 void SDFile::write(int *array, int length) {
mzling 2:ec4d7e5fa68e 39 fseek(fp, 0, SEEK_SET);
mzling 2:ec4d7e5fa68e 40 for(int i=0; i<length-1; i++) {
mzling 2:ec4d7e5fa68e 41 fprintf(fp,"%04x, ", array[i]);
mzling 2:ec4d7e5fa68e 42 }
mzling 2:ec4d7e5fa68e 43 fprintf(fp, "%04x\r\n", array[length-1]);
mzling 2:ec4d7e5fa68e 44 }
mzling 2:ec4d7e5fa68e 45