Oleg Evsegneev / FRAMLog

Log system based on external FRAM storage. Allow to collect float values in FRAM, and then store whole collection into file on flash.

Sample code

#include "mbed.h"
#include "FRAMLog.h"

SPI spi(p5,p6,p7);
FRAMLog flog(spi, p8, 4, 2048);
Serial pc(USBTX, USBRX);

int main() {
    for( int i=0; i<2048; i++){
        flog.log(i/4096.0);
        flog.log(i/(4096.0+1));
        flog.log(i/(4096.0+2));
        flog.log(i/(4096.0+3));
    }
    flog.save();
}

FileLog.cpp

Committer:
Decimus
Date:
2012-10-15
Revision:
0:f211f4870371

File content as of revision 0:f211f4870371:

/* mbed File Log Library
 * Copyright (c) 2012 Oleg Evsegneev
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
 
#include "mbed.h"
#include "FileLog.h"

FileLog::FileLog( short cols, short rows ): _local("local") {
    _cols = cols;
    _rows = rows;
    _data_idx = 0;
    _data = new float[cols*rows];
}

void FileLog::log( float value ) {
    _data[_data_idx++] = value;
}

void FileLog::save() {
    FILE *fp = fopen("/local/log.txt", "w");
    for( short i=0; i<_data_idx; i++){
        if( i && (i % _cols == 0))
            fprintf( fp, "\r\n");
        else if( i && i != _data_idx-1 )
            fprintf( fp, "\t");
        fprintf( fp, "%.4f", _data[i]);
    }
    fclose(fp);
    
    delete [] _data;
    _data = NULL;
}