// We have access to the 1PPS pin of the gps... could have trim routine for internal oscillator based on this when we have a fix

// Probabl wake up 1 minute early -- 0.45min possible +/- on wakeup time with 15min sync intervals

enum _state

{

    SYSTEM_IDLE = 0, // awaiting RTC interrupt for wakeup TODO wake up before scheduled time to get fix?

    SYSTEM_GPSACQ, // RTC interrupted

    SYSTEM_WSPRTX, // Wait for timeslot and actually transmit the message

};

static void __calc_gridloc(char *dst, double lat, double lon);

int main(void)

{

    HAL_Init();

    sysclk_init();

    gpio_init();

    adc_init();

    i2c_init();

    wspr_init();

    uint16_t blink_rate = BLINK_FAST;

    uint8_t state = SYSTEM_GPSACQ;

    uint32_t gps_polltimer = 0;

    uint32_t fix_acq_starttime = 0;

    uint32_t nextwspr_time = 0;

    uint32_t last_wspr_tx_time = 0;

    uint8_t fix_ok = 0;

    uint8_t numsats = 0;

    while (1)

    {

    	// Every 10 minutes, wake up and try to wspr

    	if(HAL_GetTick() - last_wspr_tx_time > 60000 * 10)

    	{

    		state = SYSTEM_GPSACQ;

    	}

        // Update fix status every 2 seconds

        if(HAL_GetTick() - gps_polltimer > 2000)

        {

                }

                // Schedule next wakeup (maybe 2mins prior ot timeslot if no osc trim)

                // Next wakeup should enter SYSTEM_GPSACQ state...

            } break;

        }

        if(HAL_GetTick() - led_timer > blink_rate)

        {

            led_timer = HAL_GetTick();

        }

    }

}

static void __calc_gridloc(char *dst, double lat, double lon)

{

	int o1, o2, o3;

	int a1, a2, a3;

	double remainder;

	// longitude

	remainder = lon + 180.0;

	o1 = (int)(remainder / 20.0);

	remainder = remainder - (double)o1 * 20.0;

	o2 = (int)(remainder / 2.0);

	remainder = remainder - 2.0 * (double)o2;