/**
* update noise
*/
static void update_noise() {
// set noise for first time
if(!noise_init) {
noise_init = 1;
noise_last_update_day = time_day();
noise_lifetime = drandom_rand_minmax(-SOLARPANEL_NOISE / 2, SOLARPANEL_NOISE / 2);
noise_day = drandom_rand_minmax(-SOLARPANEL_NOISE / 2, SOLARPANEL_NOISE / 2);
}
// update noise when a new day begins
if(noise_last_update_day != time_day()) {
noise_last_update_day = time_day();
noise_day = drandom_rand_minmax(-SOLARPANEL_NOISE / 2, SOLARPANEL_NOISE / 2);
}
}
/* Return a well formatted string with a time difference at millisecond resolution */
char * elapsed_time (struct timeval * start, struct timeval * stop)
{
static char et [64];
time_t elapsed = delta_time_in_milliseconds (stop, start);
if (time_day (elapsed))
sprintf (et, "%d days, %02d:%02d:%02d.%03ld",
time_day (elapsed), time_hour (elapsed), time_min (elapsed), time_sec (elapsed), time_usec (elapsed));
else if (time_hour (elapsed))
sprintf (et, "%02d:%02d:%02d.%03ld",
time_hour (elapsed), time_min (elapsed), time_sec (elapsed), time_usec (elapsed));
else if (time_min (elapsed))
sprintf (et, "%02d:%02d.%03ld", time_min (elapsed), time_sec (elapsed), time_usec (elapsed));
else if (time_sec (elapsed))
sprintf (et, "%d.%03d secs", time_sec (elapsed), time_msec (elapsed));
else
sprintf (et, "%3d msecs", time_msec (elapsed));
return et;
}
fpint solarpanel_capacity(long seconds) {
#if SOLARPANEL_EMULATE
update_noise();
// calculate energy of solar panel
fpint fp_lat = 0xDEDC; // Darmstadt: 49.878667 * PI / 180 = 0.8705
fpint fp_energy = energy_brock(time_day(), time_minute(), fp_lat);
fp_energy = energy_corrected(fp_energy, noise_lifetime + noise_day);
// convert Watthours to Milliamperhours
fpint fp_onethousand = 0x3E80000;
fpint fp_mah = fpint_mul(fpint_div(fp_energy, fpint_to(SOLARPANEL_VOLT)), fp_onethousand);
// scaled mAh down to timeframe
fpint fp_hour = 0xE100000; // 1h in seconds
return fpint_mul(fpint_div(fp_mah, fp_hour), fpint_to(seconds));
#else
#error no real solarpanel implemented
#endif
}