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();
}

Diff: FRAMLog.h

Revision:
1:4e5cda0920d3
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FRAMLog.h	Sun Oct 21 20:29:57 2012 +0000
@@ -0,0 +1,63 @@
+/* Log system for FRAM+FLASH
+* Copyright (c) 2012 Oleg Evsegneev
+* Released under the MIT License: http://mbed.org/license/mit
+*/
+
+#ifndef MBED_FILELOG_H
+#define MBED_FILELOG_H
+  
+#include "mbed.h"
+#include "FRAMSPI.h"
+
+#define LOG_FILE "/local/log.txt"
+
+/* FRAM log system main class
+*
+* @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();
+* }
+* @endcode
+*/
+
+class FRAMLog {
+
+public:
+    FRAMLog( SPI& spi, PinName ncs, short cols, short rows );
+
+    /** Set new value to log
+     *
+     * @param value Value of log entry.
+     */
+    void log( float val );
+
+    /**  Save log to file on flash
+     *
+     */
+    void save();
+        
+protected:
+    FRAMSPI _fram;
+    LocalFileSystem _local;
+    unsigned short _addr;
+    short _cols;
+    short _rows;
+    short _row;
+    void toArray( float val, char *bytes );
+    float fromArray( char *bytes );
+};
+
+#endif