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@6:0fdda2533593, 2015-02-20 (annotated)

Committer:
mzling
Date:
Fri Feb 20 20:10:14 2015 +0000
Revision:
6:0fdda2533593
Parent:
5:3f554866f226
Child:
7:51c9391e6c4c
Superficial changes to print statements.

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 4:99e9c9e0dfb0 5 #include "initDatabed.h"
mzling 2:ec4d7e5fa68e 6
mzling 2:ec4d7e5fa68e 7
mzling 4:99e9c9e0dfb0 8 SDFile::SDFile(string path, string filename, bool readOnly)
mzling 3:8f5903a77a13 9 {
mzling 2:ec4d7e5fa68e 10 //Creates the necessary directory
mzling 5:3f554866f226 11 //printf("Creating SDFile object\r\n");
mzling 3:8f5903a77a13 12 char *a = new char[path.size()+1];
mzling 3:8f5903a77a13 13 a[path.size()] = 0;
mzling 2:ec4d7e5fa68e 14 memcpy(a,path.c_str(),path.size());
mzling 2:ec4d7e5fa68e 15 //Calculates the full filename, then creates the file
mzling 2:ec4d7e5fa68e 16 std::string fullname = path + filename;
mzling 2:ec4d7e5fa68e 17
mzling 3:8f5903a77a13 18 char *b = new char[fullname.size()+1];
mzling 3:8f5903a77a13 19 b[fullname.size()] = 0;
mzling 3:8f5903a77a13 20 memcpy(b,fullname.c_str(),fullname.size());
mzling 4:99e9c9e0dfb0 21 if (readOnly) {
mzling 4:99e9c9e0dfb0 22 //printf("Opening readonly file\r\n");
mzling 4:99e9c9e0dfb0 23 //_fp = fopen((const char*)b, "r");
mzling 4:99e9c9e0dfb0 24 } else {
mzling 5:3f554866f226 25 //printf("Opening writable file\r\n");
mzling 4:99e9c9e0dfb0 26 _fp = fopen((const char*)b, "w+");
mzling 4:99e9c9e0dfb0 27 }
mzling 6:0fdda2533593 28 printf("fp is %d\r\n", _fp);
mzling 2:ec4d7e5fa68e 29 }
mzling 2:ec4d7e5fa68e 30
mzling 3:8f5903a77a13 31 /**
mzling 3:8f5903a77a13 32 * This function reads bytes from the SDFile object.
mzling 3:8f5903a77a13 33 * @author Michael Ling
mzling 3:8f5903a77a13 34 * @param length The number of bytes to read
mzling 3:8f5903a77a13 35 * @param array The int array the bytes are copied to
mzling 3:8f5903a77a13 36 * @date 2/2/2015
mzling 3:8f5903a77a13 37 */
mzling 3:8f5903a77a13 38 int* SDFile::read(int length, int *array)
mzling 3:8f5903a77a13 39 {
mzling 2:ec4d7e5fa68e 40
mzling 2:ec4d7e5fa68e 41 //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 42 fseek(_fp, -6*length, SEEK_END);
mzling 2:ec4d7e5fa68e 43 //cycle through the length of the vector and read the values.
mzling 3:8f5903a77a13 44 for(int i = 0; i < length; i++) {
mzling 3:8f5903a77a13 45 fscanf(_fp, "%x, ", &array[i]);
mzling 2:ec4d7e5fa68e 46 }
mzling 2:ec4d7e5fa68e 47
mzling 2:ec4d7e5fa68e 48 return array;
mzling 2:ec4d7e5fa68e 49 }
mzling 2:ec4d7e5fa68e 50
mzling 4:99e9c9e0dfb0 51 int* SDFile::read_from_start(int length, int *array) {
mzling 4:99e9c9e0dfb0 52 fseek(_fp, 0, SEEK_SET);
mzling 4:99e9c9e0dfb0 53 for(int i = 0; i < length; i++) {
mzling 4:99e9c9e0dfb0 54 fscanf(_fp, "%x, ", &array[i]);
mzling 4:99e9c9e0dfb0 55 }
mzling 4:99e9c9e0dfb0 56
mzling 4:99e9c9e0dfb0 57 return array;
mzling 4:99e9c9e0dfb0 58 }
mzling 4:99e9c9e0dfb0 59
mzling 3:8f5903a77a13 60 /**
mzling 3:8f5903a77a13 61 * This function writes from an array to the file pointed to by fp
mzling 3:8f5903a77a13 62 * @param length length of data to write
mzling 3:8f5903a77a13 63 * @param array array to draw written data from
mzling 3:8f5903a77a13 64 * @author Michael Ling
mzling 3:8f5903a77a13 65 * @date 2/2/2015
mzling 3:8f5903a77a13 66 */
mzling 3:8f5903a77a13 67 void SDFile::write(int length, int *array)
mzling 3:8f5903a77a13 68 {
mzling 5:3f554866f226 69 //printf("Seeking START...\r\n");
mzling 3:8f5903a77a13 70 fseek(_fp, 0, SEEK_SET);
mzling 5:3f554866f226 71 //printf("Starting to write\r\n");
mzling 3:8f5903a77a13 72 for(int i = 0; i < length-1; i++) {
mzling 4:99e9c9e0dfb0 73 /* This line fails when run on testFile, reason unknown...*/
mzling 5:3f554866f226 74 //printf("%d\r\n", fprintf(_fp, "%04x, ", array[i]));
mzling 5:3f554866f226 75 fprintf(_fp, "%04x, ", array[i]);
mzling 4:99e9c9e0dfb0 76 }
mzling 5:3f554866f226 77 // printf("%d\r\n", fprintf(_fp, "%04x\r\n", array[length-1]));
mzling 5:3f554866f226 78 fprintf(_fp, "%04x\r\n", array[length-1]);
mzling 4:99e9c9e0dfb0 79 }
mzling 4:99e9c9e0dfb0 80
mzling 4:99e9c9e0dfb0 81 void SDFile::append(int length, int *array) {
mzling 4:99e9c9e0dfb0 82 fseek(_fp, 0, SEEK_END);
mzling 4:99e9c9e0dfb0 83 for(int i = 0; i < length-1; i++) {
mzling 4:99e9c9e0dfb0 84
mzling 3:8f5903a77a13 85 fprintf(_fp, "%04x, ", array[i]);
mzling 2:ec4d7e5fa68e 86 }
mzling 3:8f5903a77a13 87 fprintf(_fp, "%04x\r\n", array[length-1]);
mzling 2:ec4d7e5fa68e 88 }
mzling 4:99e9c9e0dfb0 89 /*
mzling 4:99e9c9e0dfb0 90 void SDFile::changeAccess(string path, string filename) {
mzling 4:99e9c9e0dfb0 91 fclose(_fp);
mzling 4:99e9c9e0dfb0 92 char *a = new char[path.size()+1];
mzling 4:99e9c9e0dfb0 93 a[path.size()] = 0;
mzling 4:99e9c9e0dfb0 94 memcpy(a,path.c_str(),path.size());
mzling 4:99e9c9e0dfb0 95 //Calculates the full filename, then creates the file
mzling 4:99e9c9e0dfb0 96 std::string fullname = path + filename;
mzling 4:99e9c9e0dfb0 97
mzling 4:99e9c9e0dfb0 98 char *b = new char[fullname.size()+1];
mzling 4:99e9c9e0dfb0 99
mzling 4:99e9c9e0dfb0 100 b[fullname.size()] = 0;
mzling 4:99e9c9e0dfb0 101 memcpy(b,fullname.c_str(),fullname.size());
mzling 4:99e9c9e0dfb0 102 printf("Using name %s\r\n", b);
mzling 4:99e9c9e0dfb0 103 _fp = fopen((const char *)b, "r+");
mzling 4:99e9c9e0dfb0 104 printf("new FP is %d\r\n", _fp);
mzling 4:99e9c9e0dfb0 105 }*/
mzling 4:99e9c9e0dfb0 106
mzling 4:99e9c9e0dfb0 107 void SDFile::open_for_read(string path, string filename) {
mzling 4:99e9c9e0dfb0 108 //Creates the necessary directory
mzling 5:3f554866f226 109 //printf("Trying to open for read\r\n");
mzling 4:99e9c9e0dfb0 110 char *a = new char[path.size()+1];
mzling 4:99e9c9e0dfb0 111 a[path.size()] = 0;
mzling 4:99e9c9e0dfb0 112 memcpy(a,path.c_str(),path.size());
mzling 4:99e9c9e0dfb0 113 //Calculates the full filename, then creates the file
mzling 4:99e9c9e0dfb0 114 std::string fullname = path + filename;
mzling 4:99e9c9e0dfb0 115
mzling 4:99e9c9e0dfb0 116 char *b = new char[fullname.size()+1];
mzling 4:99e9c9e0dfb0 117 b[fullname.size()] = 0;
mzling 4:99e9c9e0dfb0 118 memcpy(b,fullname.c_str(),fullname.size());
mzling 4:99e9c9e0dfb0 119 _fp = fopen((const char*)b, "r");
mzling 4:99e9c9e0dfb0 120
mzling 5:3f554866f226 121 //printf("fp is %d\r\n", _fp);
mzling 4:99e9c9e0dfb0 122 }
mzling 4:99e9c9e0dfb0 123
mzling 4:99e9c9e0dfb0 124 void SDFile::open_for_write(string path, string filename) {
mzling 4:99e9c9e0dfb0 125
mzling 4:99e9c9e0dfb0 126 //Creates the necessary directory
mzling 5:3f554866f226 127
mzling 4:99e9c9e0dfb0 128 char *a = new char[path.size()+1];
mzling 4:99e9c9e0dfb0 129 a[path.size()] = 0;
mzling 4:99e9c9e0dfb0 130 memcpy(a,path.c_str(),path.size());
mzling 4:99e9c9e0dfb0 131 //Calculates the full filename, then creates the file
mzling 4:99e9c9e0dfb0 132 std::string fullname = path + filename;
mzling 4:99e9c9e0dfb0 133
mzling 4:99e9c9e0dfb0 134 char *b = new char[fullname.size()+1];
mzling 4:99e9c9e0dfb0 135 b[fullname.size()] = 0;
mzling 4:99e9c9e0dfb0 136 memcpy(b,fullname.c_str(),fullname.size());
mzling 4:99e9c9e0dfb0 137 _fp = fopen((const char*)b, "w+");
mzling 4:99e9c9e0dfb0 138
mzling 5:3f554866f226 139 //printf("fp is %d\r\n", _fp);
mzling 4:99e9c9e0dfb0 140 }
mzling 4:99e9c9e0dfb0 141
mzling 4:99e9c9e0dfb0 142 void SDFile::close() {
mzling 4:99e9c9e0dfb0 143 fclose(_fp);
mzling 4:99e9c9e0dfb0 144 }