sysclk_init();

    gpio_init();

    adc_init();

    i2c_init();

    gps_init();

    //jtencode_init();

    HAL_Delay(300);

    // Turn GPS on

    HAL_GPIO_WritePin(GPS_NOTEN, 0);

    // Disable ICs

    HAL_GPIO_WritePin(OSC_NOTEN, 1);

    HAL_GPIO_WritePin(TCXO_EN, 0);

    HAL_GPIO_TogglePin(LED_BLUE);

    // Start timer for WSPR

    __TIM1_CLK_ENABLE();

    htim1.Instance = TIM1;

    htim1.Init.Prescaler = 512; // gives 64uS ticks from 8MHz ahbclk

    htim1.Init.CounterMode = TIM_COUNTERMODE_UP;

    htim1.Init.Period = ctc; // Count up to this value (how many 64uS ticks per symbol)

    htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

    htim1.Init.RepetitionCounter = 0;

    HAL_TIM_Base_Init(&htim1);

    HAL_TIM_Base_Start_IT(&htim1);

    HAL_NVIC_SetPriority(TIM1_BRK_UP_TRG_COM_IRQn, 0, 0);

    HAL_NVIC_EnableIRQ(TIM1_BRK_UP_TRG_COM_IRQn);

    uint32_t led_timer = HAL_GetTick();

    uint32_t last_gps  = HAL_GetTick();

    uint32_t last_wspr  = HAL_GetTick(); //0xfffff; // start immediately.

    HAL_GPIO_TogglePin(LED_BLUE);

    HAL_Delay(100);

    HAL_GPIO_TogglePin(LED_BLUE);

    HAL_Delay(100);

    HAL_GPIO_TogglePin(LED_BLUE);

    HAL_Delay(100);

    HAL_GPIO_TogglePin(LED_BLUE);

    HAL_Delay(100);

    uint8_t lastMinute = 0;

    while (1)

    {

        if(HAL_GetTick() - last_wspr > 500)

        {

            volatile uint8_t minute = get_timestamp()[3] - 0x30;

            // If last minute was odd and this minute is even (transition)

            if(lastMinute%2 == 1 && minute%2 == 0)

                encode_wspr();

            lastMinute = minute;

            last_wspr = HAL_GetTick();

        }

        {

            HAL_GPIO_TogglePin(LED_BLUE);

            led_timer = HAL_GetTick();

        }

        if(HAL_GetTick() - last_gps > 10)

        {

            parse_gps_transmission();

            last_gps = HAL_GetTick();

        }

        //enter_sleep();

    }

}

void enter_sleep(void)

{

    //HAL_SuspendTick();

    HAL_TIM_Base_Stop_IT(&htim1);

    HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

    HAL_TIM_Base_Start_IT(&htim1);

    //HAL_ResumeTick();

}

void enter_deepsleep(void) 

{

    // Request to enter STOP mode with regulator in low power mode

    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

    // After wake-up from STOP reconfigure the PLL

    sysclk_init();

}

// Initialize system clocks

void sysclk_init(void)

{

    RCC_OscInitTypeDef RCC_OscInitStruct;

    RCC_ClkInitTypeDef RCC_ClkInitStruct;

    RCC_PeriphCLKInitTypeDef PeriphClkInit;

    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSI14;

    RCC_OscInitStruct.HSIState = RCC_HSI_ON;

    RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;

    RCC_OscInitStruct.HSICalibrationValue = 16;

    RCC_OscInitStruct.HSI14CalibrationValue = 16;

    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;

    HAL_RCC_OscConfig(&RCC_OscInitStruct);