void IRQ_Configure_PF0(void){
    /* Variables */
    GPIO_InitTypeDef GPIO_InitStruct;
    EXTI_InitTypeDef EXTI_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;
    /* Enable clock for GPIOF */
    RCC_AHB1PeriphClockCmd(IRQ_GPIO_CLK, ENABLE);
    /* Enable clock for SYSCFG */
    RCC_APB2PeriphClockCmd(SYSCFG_CLK, ENABLE);
    /* GPIO Config */
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; // Input Mode
        GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; // Push Pull
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0; // Pin PF0
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; // UP
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(IRQ_GPIO_PORT, &GPIO_InitStruct);
    /* EXTI Config */
    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF, EXTI_PinSource0); // Tell system that it will use PF0 for EXTI_Line0
    EXTI_InitStruct.EXTI_Line = EXTI_Line0; // PF0 is connected to EXTI_Line0
    EXTI_InitStruct.EXTI_LineCmd = ENABLE; // Enable interrupt
    EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt; // Interrupt mode
    EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising; // Triggers on rising
    EXTI_Init(&EXTI_InitStruct); // Add to EXTI
    /* Add IRQ vector to NVIC */
    NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn; // PF0 is connected to EXTI_Line0, which has EXTI0_IRQn vector
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00; // Set priority
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00; // Set sub priority
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; // Enable interrupt
    NVIC_Init(&NVIC_InitStruct); // Add to NVIC
}
void EXTI0_IRQHandler(void){
    if (EXTI_GetITStatus(EXTI_Line0) != RESET) // Make sure that interrupt flag is set
        {
            uint8_t mainreg;
            mainreg = AS3911B_Read_Register(AS3911B_MAIN_IT); // Looking for IT Source, we have to read the 3 IT registers in 1 attempt
            if((mainreg & 0x01) == 0x01) // IRQ due to error and wake-up timer
            {
                uint8_t auxreg1 = AS3911B_Read_Register(AS3911B_ERROR_WAKEUP_IT); // Reading Auxiliary IT Register 2
                if (auxreg1 & 0x80) {} // CRC Error
                else if (auxreg1 & 0x40) {}// Parity error
                else if (auxreg1 & 0x20) {}// Soft framing error
                else if (auxreg1 & 0x10) {}// Hard framing error
                else if (auxreg1 & 0x08) {}// Wake-up interrupt
                else if (auxreg1 & 0x04) {}// Wake-up interrupt due to Amplitude Measurement
                else if (auxreg1 & 0x02) {}// Wake-up interrupt due to Phase Measurement
                else if (auxreg1 & 0x01) // Wake-up interrupt due to Capacitance Measurement
                {
                    //cardPresent=1
                    AS3911B_Enter_Ready_Mode();
        }
            }
            else if((mainreg & 0x02) == 0x02) // IRQ due to timer or NFC event
            {
                uint8_t auxreg2 = AS3911B_Read_Register(AS3911B_TIMER_NFC_IT);
                if (auxreg2 & 0x80) {TM_DISCO_LedOn(LED_GREEN);} // Termination of Direct Command
                else if (auxreg2 & 0x40) {}// No-response Timer expire
                else if (auxreg2 & 0x20) {}// GP Timer expire
                else if (auxreg2 & 0x10) {}// External field greater than target activation level
                else if (auxreg2 & 0x08) {}// External field less than target activation level
                else if (auxreg2 & 0x04) {}// Collision detected during RF Collision avoidance
                else if (auxreg2 & 0x02) {}// Minimum guard time expire
                else if (auxreg2 & 0x01) {}// Initiator bitrate recognized
            }
            else if((mainreg & 0x04) == 0x04) // IRQ due to bit collision
            {
            }
            else if((mainreg & 0x08) == 0x08) // IRQ due to end of transmission
            {
            }
            else if((mainreg & 0x10) == 0x10) // IRQ due to end of receive
            {
            }
            else if((mainreg & 0x20) == 0x20) // IRQ due to start of receive
            {
            }
            else if((mainreg & 0x40) == 0x40) // IRQ due to FIFO water level
            {
            }
            else if((mainreg & 0x80) == 0x80) // IRQ when oscillator frequency is stable
            {
            }
      EXTI_ClearITPendingBit(EXTI_Line0); // Clear interrupt flag
    }
}