Emery Premeaux / Mbed 2 deprecated Examples

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Dependencies:   mbed SDFileSystem

09_Files_SD/SD_Index_File.cpp@2:17a5c34b3a79, 2019-07-09 (annotated)

Committer:
epremeaux
Date:
Tue Jul 09 02:23:18 2019 +0000
Revision:
2:17a5c34b3a79
Added SD card examples. Had to roll back the MBED library to maintain SDFileSystem compatability

Who changed what in which revision?

UserRevisionLine numberNew contents of line
epremeaux 2:17a5c34b3a79 1 /*
epremeaux 2:17a5c34b3a79 2 * Opens index.txt, reads a number from the file (as charactor binary value)
epremeaux 2:17a5c34b3a79 3 * Closes that file, then creates a file name string by adding one to the index number
epremeaux 2:17a5c34b3a79 4 * Creates and opens a new file with the file name string, and writes some text before closing.
epremeaux 2:17a5c34b3a79 5 *
epremeaux 2:17a5c34b3a79 6 */
epremeaux 2:17a5c34b3a79 7
epremeaux 2:17a5c34b3a79 8
epremeaux 2:17a5c34b3a79 9 #ifdef COMPILE_SD_Index_File
epremeaux 2:17a5c34b3a79 10
epremeaux 2:17a5c34b3a79 11 #include "SDFileSystem.h"
epremeaux 2:17a5c34b3a79 12
epremeaux 2:17a5c34b3a79 13 SDFileSystem sd(PB_5, PB_4, PB_3, PA_11, "sd"); // MOSI, MISO SCLK, CS, "name"
epremeaux 2:17a5c34b3a79 14
epremeaux 2:17a5c34b3a79 15 int last_file_num;
epremeaux 2:17a5c34b3a79 16
epremeaux 2:17a5c34b3a79 17
epremeaux 2:17a5c34b3a79 18 int main() {
epremeaux 2:17a5c34b3a79 19 FILE *IndexFile = fopen("/sd/index.txt", "r"); // get the last file number from the index file
epremeaux 2:17a5c34b3a79 20 last_file_num = fgetc(IndexFile);
epremeaux 2:17a5c34b3a79 21 printf("Got: %i \n", last_file_num);
epremeaux 2:17a5c34b3a79 22 fclose(IndexFile);
epremeaux 2:17a5c34b3a79 23 last_file_num++;
epremeaux 2:17a5c34b3a79 24 IndexFile = fopen("/sd/index.txt", "w"); // wrte the new number into the index file
epremeaux 2:17a5c34b3a79 25 fputc(last_file_num, IndexFile);
epremeaux 2:17a5c34b3a79 26 fclose(IndexFile);
epremeaux 2:17a5c34b3a79 27
epremeaux 2:17a5c34b3a79 28 char filename[12];
epremeaux 2:17a5c34b3a79 29 sprintf(filename, "/sd/%i.txt", last_file_num); // build new filename to open
epremeaux 2:17a5c34b3a79 30
epremeaux 2:17a5c34b3a79 31 FILE *File = fopen(filename, "w");
epremeaux 2:17a5c34b3a79 32 if(File == NULL) {
epremeaux 2:17a5c34b3a79 33 printf("Could not open file to write\n");
epremeaux 2:17a5c34b3a79 34 }
epremeaux 2:17a5c34b3a79 35 else {
epremeaux 2:17a5c34b3a79 36 printf("SD card file opened: %s\n", filename);
epremeaux 2:17a5c34b3a79 37 fprintf(File, "heres some data!");
epremeaux 2:17a5c34b3a79 38 fclose(File);
epremeaux 2:17a5c34b3a79 39 printf("closed\n");
epremeaux 2:17a5c34b3a79 40 }
epremeaux 2:17a5c34b3a79 41 }
epremeaux 2:17a5c34b3a79 42
epremeaux 2:17a5c34b3a79 43 #endif
epremeaux 2:17a5c34b3a79 44