Compiler optimization disabling VCP output about airdamon_f3 HOT 2 OPEN

uint32_t __attribute__((optimize("O0"))) CDC_Send_DATA(uint8_t *ptrBuffer, uint32_t sendLength)
{
    /* Last transmission hasn't finished, abort */
    if (packetSent) {
        return 0;
    }

    // We can only put 64 bytes in the buffer
    if (sendLength > 64 / 2) {
        sendLength = 64 / 2;
    }

    // Try to load some bytes if we can
    if (sendLength) {
        UserToPMABufferCopy(ptrBuffer, ENDP1_TXADDR, sendLength);
        SetEPTxCount(ENDP1, sendLength);
        packetSent += sendLength;
        SetEPTxValid(ENDP1);
    }

    return sendLength;
}

void __attribute__((optimize("O0"))) Virtual_Com_Port_Reset(void)
{
    /* Set Virtual_Com_Port DEVICE as not configured */
    pInformation->Current_Configuration = 0;

    /* Current Feature initialization */
    pInformation->Current_Feature = Virtual_Com_Port_ConfigDescriptor[7];

    /* Set Virtual_Com_Port DEVICE with the default Interface*/
    pInformation->Current_Interface = 0;

    SetBTABLE(BTABLE_ADDRESS);

    /* Initialize Endpoint 0 */
    SetEPType(ENDP0, EP_CONTROL);
    SetEPTxStatus(ENDP0, EP_TX_STALL);
    SetEPRxAddr(ENDP0, ENDP0_RXADDR);
    SetEPTxAddr(ENDP0, ENDP0_TXADDR);
    Clear_Status_Out(ENDP0);
    SetEPRxCount(ENDP0, Device_Property.MaxPacketSize);
    SetEPRxValid(ENDP0);

    /* Initialize Endpoint 1 */
    SetEPType(ENDP1, EP_BULK);
    SetEPTxAddr(ENDP1, ENDP1_TXADDR);
    SetEPTxStatus(ENDP1, EP_TX_NAK);
    SetEPRxStatus(ENDP1, EP_RX_DIS);

    /* Initialize Endpoint 2 */
    SetEPType(ENDP2, EP_INTERRUPT);
    SetEPTxAddr(ENDP2, ENDP2_TXADDR);
    SetEPRxStatus(ENDP2, EP_RX_DIS);
    SetEPTxStatus(ENDP2, EP_TX_NAK);

    /* Initialize Endpoint 3 */
    SetEPType(ENDP3, EP_BULK);
    SetEPRxAddr(ENDP3, ENDP3_RXADDR);
    SetEPRxCount(ENDP3, VIRTUAL_COM_PORT_DATA_SIZE);
    SetEPRxStatus(ENDP3, EP_RX_VALID);
    SetEPTxStatus(ENDP3, EP_TX_DIS);

    /* Set this device to response on default address */
    SetDeviceAddress(0);

    bDeviceState = ATTACHED;
}