input_event 키 정의, 키 맵핑 좀 가르쳐주세요 ㅠㅠ

void Serial_Daemon::Keydown_Event(char key_down[10])
{
    struct input_event event;
    char Receive_Packetf[10] = {0, };
    strcpy(Receive_Packetf,key_down);
    //Input key event
    qDebug() << "g_Packet_Buffer contents:" << (int)g_Packet_Buffer[4];
    memset(&event,0,sizeof(event));
    event.type = EV_KEY;
    event.code = Receive_Packetf[4];
    event.value = 1;
    write(key_fd,&event,sizeof(event));
    //Sync event
    memset(&event,0,sizeof(event));
    event.type = EV_SYN;
    event.code = SYN_REPORT;
    event.value = 0;
    write(key_fd,&event,sizeof(event));
}
 
void Serial_Daemon::OperThread()
{
    int ptr_start, ptr_end;
    unsigned int crc_buf;
    /* check STX and ETX in packet */
    m_abyBuffer.FindChar(STX,ptr_start);
    m_abyBuffer.FindChar(ETX,ptr_end);
    if((ptr_start >= ptr_end) && (ptr_end - ptr_start != 8)){
        return;
    }
    if ( (ptr_start != 0) && (ptr_end != 8) ) {
        m_abyBuffer.m_iReadPtr = m_abyBuffer.m_iReadPtr + ptr_start;
        memset (g_Packet_Buffer, 0, sizeof(g_Packet_Buffer));
        m_abyBuffer.ReadBinary(g_Packet_Buffer, (ptr_end-ptr_start)+1);
    }
    else {
        memset (g_Packet_Buffer, 0, sizeof(g_Packet_Buffer));
        m_abyBuffer.ReadBinary(g_Packet_Buffer, PACKET_LENGTH);
    }
    /* Pasing packet */
    if(g_Packet_Buffer[1] != MOD_GET){
        return;
    }
    if(g_Packet_Buffer[2] != SEL_KEYPAD){
        return;
    }
    crc_buf = crc16_append(g_Packet_Buffer,6);
    if((g_Packet_Buffer[6] !=(char)((crc_buf>>8)&0xff)) ||  (g_Packet_Buffer[7]!=(char)(crc_buf&0xff))){	//CRC Check
        return;
    }
    if(g_Packet_Buffer[3] == KEYPAD_DOWN){
        Keydown_Event(g_Packet_Buffer);
    }
    if(g_Packet_Buffer[3] == KEYPAD_UP){
        Keyup_Event(g_Packet_Buffer);
    }
}