rc_check_battery.c

/**
 * @file rc_check_battery.c
 * @example    rc_check_battery
 *
 * Simple program to display battery state
 */

#include <stdio.h>
#include <rc/adc.h>
#include <rc/start_stop.h>
#include <rc/time.h>

#define VOLTAGE_DISCONNECT      1 // Threshold for detecting disconnected battery

int main()
{
        double pack_voltage;    // 2S pack voltage on JST XH 2S balance connector
        double cell_voltage;    // cell voltage
        double jack_voltage;    // could be dc power supply or another battery

        // start signal handler so we can exit cleanly
        if(rc_enable_signal_handler()==-1) return -1;

        if(rc_adc_init()==-1) return -1;

        while(rc_get_state()!=EXITING){
                // read in the voltage of the 2S pack and DC jack
                pack_voltage = rc_adc_batt();
                jack_voltage = rc_adc_dc_jack();

                // sanity check the SDC didn't return an error
                if(pack_voltage<0.0 || jack_voltage<0.0){
                        fprintf(stderr,"ERROR: can't read voltages\n");
                        return -1;
                }

                // check if a pack is on the 2S balance connector
                if(pack_voltage<VOLTAGE_DISCONNECT){
                        pack_voltage = 0;
                }

                if(jack_voltage<VOLTAGE_DISCONNECT){
                        jack_voltage = 0;
                }

                // 2S pack, so divide by two for cell voltage
                cell_voltage = pack_voltage/2;

                // print results
                printf("\rPack: %0.2lfV   Cell: %0.2lfV   DC Jack: %0.2lfV  ", \
                                        pack_voltage, cell_voltage, jack_voltage);
                fflush(stdout);

                //check periodically
                rc_usleep(100000);
        }

        rc_adc_cleanup();
        return 0;
}