Version 3.0: Switching to newer LDC1614 which is placed on the same PCB.
Dependencies: Bob DS1825 LDC1614 LDC1101 SDFileSystem mbed
Fork of Inductive_Sensor by
main.cpp
- Committer:
- bobgiesberts
- Date:
- 2016-04-12
- Revision:
- 12:cceece4f3afb
- Parent:
- 11:599ca9982e45
- Child:
- 13:2caedc56b863
File content as of revision 12:cceece4f3afb:
/** * @file main.cpp * @brief This file programs the processor for the inductive force sensor * using the library LDC1101.h and LDC1101.cpp. * - Led: processing communication with LDC1101 * * Log protocol: * - 1 minute at 20 Hz * - 29 minutes rest * * @author Bob Giesberts * * @date 2015-12-17 */ #include "mbed.h" #include "LDC1101.h" // inductive force sensor #include "SDFileSystem.h" // control the SD card #include "Bob.h" // processorboard #include "DS1825.h" // thermometer #include <iostream> #include <vector> #include <string> using namespace std; // SETTINGS bool DEBUG = false; float C = 120E-12; // Capacitor in F uint16_t INTERVAL_FIRST = 600; // First sampling time in seconds. 60:00 minutes = 600 sec uint16_t INTERVAL_OFF = 870; // Waiting interval in seconds. 14:30 minutes = 870 sec (14*60+30) uint16_t INTERVAL_ON = 30; // Sampling interval in seconds. 0:30 minutes = 30 sec // Correct pinnames // PinName _LEDpin = PTB0; // For the first sensor (a bright red led) // PinName _Tpin = PTB1; // For the first sensor PinName _LEDpin = PTB1; // For all other sensors (a faint green led) PinName _Tpin = PTB0; // For all other sensors // load libraries Bob bob( _LEDpin, // LED PTC3, // sd_enable PTE0, // sd_present PTC2, // battery PTE30 // 3V3_DET TODO: can we use this to detect if we're charging the battery? If so, how should we respond? ); // Serial pc(USBTX, USBRX); // timer variables uint32_t now = 0, next = 0, prev = 0; uint8_t t_high = 0; uint32_t t_lost = 0, lost_prev = 0; uint8_t lost_high = 0; uint32_t t_sleep = 0; uint32_t t; // file variables FILE *fp; string filename = "/sd/data00.txt"; const char *fn; // temperature variables uint8_t Tdata[9]; int16_t T_bin; float T; // temporal storage for data samples const uint8_t package_size = 60; // ±12-13 Hz, so 60 would take about 5 sec. struct mydata { uint32_t t[package_size]; // time (s) uint32_t L[package_size]; // LHR_DATA } collected; uint8_t counter = 0; // function to write all data to the SD card void storeit( float T ) { // write data to SD card bob.ledon(); fp = fopen( fn, "a" ); // open file (append) for( int i = 0; i < counter; i++ ) fprintf( fp, "%.2f;%d;%.4f;%.4f\r\n", (float) collected.t[i]/100.0, collected.L[i], bob.battery(), T ); // write to file fclose( fp ); // close file bob.ledoff(); // pc.printf( "%d points: %.2f;%d;%.4f;%.4f\r\n", counter, (float) collected.t[0]/100.0, collected.L[0], bob.battery(), T ); // Reset data memset(collected.t, 0, counter); memset(collected.L, 0, counter); counter = 0; } int main(void) { // Load SD File system // - the Raspberry Pie SD cards give a warning here that might just be ignored: // "Not in idle state after sending CMD8 (not an SD card?) // Didn't get a response from the disk // Set 512-byte block timed out" // TODO: buy 'better' SD cards from IAPC / the Stores (Kingston ...) bob.wakeup(); SDFileSystem *sd = new SDFileSystem(PTD6, // mosi PTD7, // miso PTD5, // sclk PTD4, // cs "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.ledon(); // error: unable to create new file } } else { // file already exists fclose( fp ); } } if( fp == NULL ) { bob.ledon(); // error: file 00 - 99 already exists // pc.printf( "/sd/data00.txt t/m /sd/data99.txt already exist!\n" ); } // Unload SD File system delete sd; sd = NULL; while(1) { // Wakeup: SD + LDC1101 on bob.wakeup(); // what time is it now? 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) t = now + 429496.7296*t_high + t_lost + 429496.7296*lost_high; // 0 -> 219 901 952 --> (2 199 019,52 s) (25 days) // load libraries to take control over the communication LDC1101 *ldc = new LDC1101( PTC6, // mosi PTC7, // miso PTC5, // sck PTC4, // cs C, // capacitor 16E6 // f_CLKIN ); // load sensor (LDC1101) library (this takes 0.81 s) DS1825 *thermometer = new DS1825( _Tpin ); // load thermometer (DS1825) library SDFileSystem *sd = new SDFileSystem(PTD6, // mosi PTD7, // miso PTD5, // sclk PTD4, // cs "sd" ); // load SD system on mkdir("/sd", 0777); // select folder // How long should we takes samples? if( next == 0 ) { next = t + INTERVAL_FIRST*100; } else { next = t + INTERVAL_ON*100; // 0 -> 219 904 952 --> (2 199 049,52 s) (25 days) } // Take samples for INTERVAL_ON seconds while( t < next ) { // wait for new data to be ready while( !ldc->is_New_LHR_data() ) { } // what time is it now? prev = now; now = (uint32_t) clock(); if( now < prev ) t_high++; t = now + 429496.7296*t_high + t_lost + 429496.7296*lost_high; if( !ldc->is_Oscillation_Error() ) // sensor overloaded, this happends when the target is too close to the coil { // Store data in temporal memory collected.t[counter] = t; collected.L[counter] = ldc->get_LHR_Data(); counter++; } // Write a full package of data points to the SD card if( counter >= package_size-1 ) storeit( thermometer->getTemperature() ); } // Write remaining data to the SD card if( counter > 0 ) storeit( thermometer->getTemperature() ); // prepare for sleep, power down the SD and the LDC1101 delete sd; sd = NULL; // unload library to be able to power down completely delete ldc; ldc = NULL; // unload library to be able to power down completely delete thermometer; thermometer = NULL; // unload library to be able to power down completely bob.beforesleep(); // if the battery is almost empty (Vbatt < 3.10 V), the termometer stops // working well and L can not be corrected. So just shut down... if( bob.battery() < 3.10f ) { bob.ledon(); // error: battery empty // pc.printf( "Battery empty (%.1f V), shutting down.\n", bob.battery() ); exit(0); } // what time is it now? prev = now; now = (uint32_t) clock(); if( now < prev ) t_high++; t = now + 429496.7296*t_high + t_lost + 429496.7296*lost_high; // Calculate sleeping time (correction to INTERVAL_OFF) // t has passed the limit of next. Those few ms are substracted from INTERVAL_OFF. t_sleep = INTERVAL_OFF*100 - (t - next); // Calculate time that will be lost during sleep lost_prev = t_lost; t_lost += t_sleep; if( t_lost < lost_prev ) lost_high++; // Sleep now (ms), enter low power mode bob.sleep( t_sleep * 10 ); } }