SDFileSystem, slightly modified for the ExoController
Dependents: Data-Management-Honka
Fork of SDFileSystem_HelloWorld by
SDFile.cpp@3:8f5903a77a13, 2015-02-04 (annotated)
- Committer:
- mzling
- Date:
- Wed Feb 04 23:58:12 2015 +0000
- Revision:
- 3:8f5903a77a13
- Parent:
- 2:ec4d7e5fa68e
- Child:
- 4:99e9c9e0dfb0
Got code working!
Who changed what in which revision?
User | Revision | Line number | New 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 | 3:8f5903a77a13 | 7 | SDFile::SDFile(string path, string filename) |
mzling | 3:8f5903a77a13 | 8 | { |
mzling | 2:ec4d7e5fa68e | 9 | //Creates the necessary directory |
mzling | 3:8f5903a77a13 | 10 | printf("Creating SDFile object\r\n"); |
mzling | 3:8f5903a77a13 | 11 | char *a = new char[path.size()+1]; |
mzling | 3:8f5903a77a13 | 12 | a[path.size()] = 0; |
mzling | 2:ec4d7e5fa68e | 13 | memcpy(a,path.c_str(),path.size()); |
mzling | 2:ec4d7e5fa68e | 14 | //Calculates the full filename, then creates the file |
mzling | 2:ec4d7e5fa68e | 15 | std::string fullname = path + filename; |
mzling | 2:ec4d7e5fa68e | 16 | |
mzling | 3:8f5903a77a13 | 17 | char *b = new char[fullname.size()+1]; |
mzling | 3:8f5903a77a13 | 18 | b[fullname.size()] = 0; |
mzling | 3:8f5903a77a13 | 19 | memcpy(b,fullname.c_str(),fullname.size()); |
mzling | 3:8f5903a77a13 | 20 | _fp = fopen((const char*)b, "w+"); |
mzling | 3:8f5903a77a13 | 21 | printf("fp is %d\r\n", _fp); |
mzling | 2:ec4d7e5fa68e | 22 | |
mzling | 2:ec4d7e5fa68e | 23 | |
mzling | 2:ec4d7e5fa68e | 24 | } |
mzling | 2:ec4d7e5fa68e | 25 | |
mzling | 3:8f5903a77a13 | 26 | /** |
mzling | 3:8f5903a77a13 | 27 | * This function reads bytes from the SDFile object. |
mzling | 3:8f5903a77a13 | 28 | * @author Michael Ling |
mzling | 3:8f5903a77a13 | 29 | * @param length The number of bytes to read |
mzling | 3:8f5903a77a13 | 30 | * @param array The int array the bytes are copied to |
mzling | 3:8f5903a77a13 | 31 | * @date 2/2/2015 |
mzling | 3:8f5903a77a13 | 32 | */ |
mzling | 3:8f5903a77a13 | 33 | int* SDFile::read(int length, int *array) |
mzling | 3:8f5903a77a13 | 34 | { |
mzling | 2:ec4d7e5fa68e | 35 | |
mzling | 2:ec4d7e5fa68e | 36 | //shift to the end of the file and go back accounting for the commas, spaces, \n, and \r (6 places per data) |
mzling | 3:8f5903a77a13 | 37 | fseek(_fp, -6*length, SEEK_END); |
mzling | 2:ec4d7e5fa68e | 38 | //cycle through the length of the vector and read the values. |
mzling | 3:8f5903a77a13 | 39 | for(int i = 0; i < length; i++) { |
mzling | 3:8f5903a77a13 | 40 | fscanf(_fp, "%x, ", &array[i]); |
mzling | 2:ec4d7e5fa68e | 41 | } |
mzling | 2:ec4d7e5fa68e | 42 | |
mzling | 2:ec4d7e5fa68e | 43 | return array; |
mzling | 2:ec4d7e5fa68e | 44 | } |
mzling | 2:ec4d7e5fa68e | 45 | |
mzling | 3:8f5903a77a13 | 46 | /** |
mzling | 3:8f5903a77a13 | 47 | * This function writes from an array to the file pointed to by fp |
mzling | 3:8f5903a77a13 | 48 | * @param length length of data to write |
mzling | 3:8f5903a77a13 | 49 | * @param array array to draw written data from |
mzling | 3:8f5903a77a13 | 50 | * @author Michael Ling |
mzling | 3:8f5903a77a13 | 51 | * @date 2/2/2015 |
mzling | 3:8f5903a77a13 | 52 | */ |
mzling | 3:8f5903a77a13 | 53 | void SDFile::write(int length, int *array) |
mzling | 3:8f5903a77a13 | 54 | { |
mzling | 3:8f5903a77a13 | 55 | fseek(_fp, 0, SEEK_SET); |
mzling | 3:8f5903a77a13 | 56 | for(int i = 0; i < length-1; i++) { |
mzling | 3:8f5903a77a13 | 57 | fprintf(_fp, "%04x, ", array[i]); |
mzling | 2:ec4d7e5fa68e | 58 | } |
mzling | 3:8f5903a77a13 | 59 | fprintf(_fp, "%04x\r\n", array[length-1]); |
mzling | 2:ec4d7e5fa68e | 60 | } |
mzling | 2:ec4d7e5fa68e | 61 |