File content as of revision 9:47f1b1c0ef8b:

#include "mbed.h"
#include "LDC1101.h"
#include "SDFileSystem.h"
#include "Bob.h"
#include <iostream>
#include <vector>
#include <string>
using namespace std;

/**
* @file main.cpp
* @brief This file programs the processor for the inductive force sensor
* using the library LDC1101.h and LDC1101.cpp.
* - Red Led: processing communication with LDC1101
* - Green Led: processing SD card
* 
* Log protocol:
* -  1 minute  at 20 Hz
* - 29 minutes rest
*
* @author Bob Giesberts
*
* @date 2015-12-17
*/

// SETTINGS
bool DEBUG = false;
float C = 120E-12;      // pF
int INTERVAL_ON  = 1;  //   30 =       30 sec
int INTERVAL_OFF = 60;  // 1770 = 29*60+30 sec

// load libraries
Bob bob(PTB0, PTB1, PTC3, PTE0, PTC2, PTE30); // red led, green led, sd_enable, sd_present, batt, 3V3_DET
Serial pc(USBTX, USBRX);

// timer variables
uint32_t now = 0, next = 0, prev = 0;
uint8_t t_high = 0;
uint32_t lost = 0, lost_prev = 0;
uint8_t lost_high = 0;
uint16_t t_sleep = 0;

// file variables
FILE *fp;
string filename = "/sd/data00.txt";
const char *fn;

// temporal storage for data samples
vector < uint32_t > Svector;
uint32_t S;
vector < uint32_t > Lvector;
uint32_t L;
float batt;

float f;

int main(void){

    if( DEBUG ){
        LDC1101 *ldc = new LDC1101(PTC6, PTC7, PTC5, PTC4, C, 16E6);
        
        wait(1);
        f = ldc->get_fsensor();
        
        while(1){
            while( !ldc->is_New_LHR_data() ){ } // wait until data is ready
            
            L = ldc->get_LHR_Data();
            pc.printf( "%d", L );
            //pc.printf( "%.3f MHz", ldc->get_fsensor()/1000000 );
            //pc.printf( "%.3f KHz", (f - ldc->get_fsensor())/1000 );
            
            pc.printf( "\r\n" );
            wait( 10 ); // 20 Hz
        }
    }



    bob.flash(2);
    pc.printf( "check sd: %d\r\n", bob.checkSD() );
    // Load SD File system
    
    
    // bob.wakeup();
    bob.SDon();
    SDFileSystem *sd = new SDFileSystem(PTD6, PTD7, PTD5, PTD4, "sd");
    
    // Create a new data file (data00.txt)
    mkdir("/sd", 0777);   
    for(uint8_t i = 0; i < 100; i++) {
        filename[8] = i/10 + '0';
        filename[9] = i%10 + '0';
        fp = fopen( filename.c_str() , "r" );
        if( fp == NULL ) { // read failed so file does not exist
            fp = fopen( filename.c_str(), "w" ); // create it
            if( fp != NULL ){
                fn = filename.c_str();
                fclose( fp );
                break;
            }else{
                bob.red();
            }
        }else{ // file already exists
            fclose( fp );
        }
    }
        
    // Unload SD File system
    delete sd; sd = NULL;


    while(1)
    {        
        // SD on + sensor on
        bob.SDon();

        // Sensor on        
        LDC1101 *ldc = new LDC1101(PTC6, PTC7, PTC5, PTC4, C, 16E6);
        
        // SD on
        SDFileSystem *sd = new SDFileSystem(PTD6, PTD7, PTD5, PTD4, "sd"); 
        mkdir("/sd", 0777); // select folder  
        
        // time
        prev = now;                                                     // 0 -> 429 496     --> (4 294,96 s)        (71 min)
        now = (uint32_t) clock();                                       // 0 -> 429 496     --> (4 294,96 s)        (71 min)
        if( now < prev ) t_high++;                                      // 0 -> 255         --> (255*4 294,96 s)    (12 days)
        S = now + 429496.7296*t_high + lost + 429496.7296*lost_high;    // 0 -> 219 901 952 --> (2 199 019,52 s)    (25 days)
        
        // first time take a comfortably long period
        if( next == 0 ){
            next = S + (INTERVAL_ON + INTERVAL_OFF)*100;
        }else{
            next = S + INTERVAL_ON*100;                                 // 0 -> 219 904 952 --> (2 199 049,52 s)    (25 days)
        }
        
        // Take samples for INTERVAL_ON seconds
        while( S < next )
        {
            // Collect a package 16 data points
            while( Lvector.size() < 16 ) // Write is per 512 bits: 16 * 32 = 512
            {
                // wait for new data to be ready
                while( !ldc->is_New_LHR_data() ) { }
                
                if( !ldc->is_Oscillation_Error() ){ // sensor not overloaded
                    // time
                    prev = now;
                    now = (uint32_t) clock();
                    if( now < prev ) t_high++;
                    S = now + 429496.7296*t_high + lost + 429496.7296*lost_high;
                    
                    // induction
                    L = ldc->get_LHR_Data();

                    // Store data in temporal memory
                    Svector.push_back( S );
                    Lvector.push_back( L );                    
                }
            }
            
            pc.printf("%d; %02x\r\n", L, ldc->get_LHR_status() );
            
            // battery level
            batt = bob.battery();
    
            // Store the package of 16 data points
            bob.green();
            fp = fopen( fn, "a" ); // open file
            for( int i = 0; i < Lvector.size(); i++ )
                fprintf( fp, "%.2f;%d;%.4f\r\n", (float) Svector.at(i)/100.0, Lvector.at(i), batt ); // write to file
            fclose( fp ); // close file
            bob.greenoff();

                       
            // Release data
            Lvector.clear();
            Svector.clear();
            
        }               
        
        // SD off
        delete sd; sd = NULL;
        bob.SDoff();
        DigitalOut *sdP2 = new DigitalOut(PTD4); sdP2->write(0); delete sdP2; sdP2 = NULL;// cs
        DigitalOut *sdP3 = new DigitalOut(PTD6); sdP3->write(0); delete sdP3; sdP3 = NULL;// mosi
        DigitalOut *sdP5 = new DigitalOut(PTD5); sdP5->write(0); delete sdP5; sdP5 = NULL;// sck
        DigitalOut *sdP7 = new DigitalOut(PTD7); sdP7->write(0); delete sdP7; sdP7 = NULL;// miso 
        
        // Sensor off
        delete ldc; ldc = NULL;
        DigitalOut *senP2 = new DigitalOut(PTC7); senP2->write(0); delete senP2; senP2 = NULL; // miso
        DigitalOut *senP3 = new DigitalOut(PTC5); senP3->write(0); delete senP3; senP3 = NULL; // sck
        DigitalOut *senP4 = new DigitalOut(PTC6); senP4->write(0); delete senP4; senP4 = NULL; // mosi
        DigitalOut *senP5 = new DigitalOut(PTC4); senP5->write(0); delete senP5; senP5 = NULL; // cs
        
        
        
        // Calculate sleeping time (correction to INTERVAL_OFF)
        prev = now;
        now = (uint32_t) clock();
        if( now < prev ) t_high++;
        S = now + 429496.7296*t_high + lost + 429496.7296*lost_high;
        
        t_sleep = ( INTERVAL_OFF*100 - (S - next) );

        // Add lost time to the counter
        lost_prev = lost;
        lost += t_sleep;
        if( lost < lost_prev ) lost_high++;
        
        // Sleep now...
        // pc.printf( "zzz... (%f) \r\n\r\n", (float) (t_sleep / 100.0) );
        bob.sleep( (float) ( t_sleep / 100.0) );
        
    }

}