stm32 gps system

//BY EDEN SHEIKO BEFORE CHANGES
#include "RTG.h"

char txF = ZERO, rxF = ZERO;

data_t data;

#define STRUCT_SIZE_DATA (sizeof(data))

void print_struct(data_t *ptr);

void rtg_main() {
    while(TRUE){
    receive_data();
    update_data();
    send_data();
    }
}

void send_data() {
    HAL_StatusTypeDef status = HAL_OK;
    int8_t buffer[STRUCT_SIZE_DATA];
    memcpy(buffer,&data,STRUCT_SIZE_DATA);

    for (;;) {
        printf("send_data\r\n");
        status = HAL_UART_Transmit_IT(UART_4, buffer,STRUCT_SIZE_DATA);
        if (status != HAL_OK) {
            printf("Failed HAL_UART_Transmit: %d\n\r", status);
        }
        //while (HAL_UART_GetState(UART_4) != HAL_UART_STATE_READY);
        //while (!txF);
        //txF = 0;
        return; //
    }
}

void receive_data() {
    HAL_StatusTypeDef status = HAL_OK;
    for (;;) {
        printf("receive_data\r\n");
        int8_t buffer[STRUCT_SIZE_DATA];
        status = HAL_UART_Receive_IT(UART_4, buffer, STRUCT_SIZE_DATA);
        if (status != HAL_OK) {
            printf("Failed HAL_UART_recivie: %d\n\r", status);
        }

        if(rxF){
            HAL_UART_Receive_IT(UART_4, buffer, STRUCT_SIZE_DATA);
            memcpy(&data,buffer,STRUCT_SIZE_DATA);
            print_struct(&data);
            return;
            rxF = 0;
        }

        HAL_Delay(500);
    }


}


void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { //got info good

    if (UART_4 == huart) {
        HAL_GPIO_TogglePin (GPIOB, GPIO_PIN_14);
        rxF = 1;
    }

}


void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) { // send data good
    if (UART_4 == huart) {
        txF = 1;
    } else {
        UNUSED(huart);
    }
}

uint32_t RNG_GetRandomNumber(void)
{
  uint32_t random_number;
  if (HAL_RNG_GenerateRandomNumber(&hrng, &random_number) != HAL_OK)
  {
      Error_Handler();
  }
  return random_number;
}

void update_data() {
    data.m_x = RNG_GetRandomNumber();
    data.m_y = RNG_GetRandomNumber();

}

void print_struct(data_t *ptr) {
    printf("Signal Received: %d\r\n", ptr->m_bit);
}