text: /**
    ******************************************************************************
    * @file    LwIP/LwIP_HTTP_Server_Netconn_RTOS/Inc/lwipopts.h
    * @author  MCD Application Team
    * @brief   lwIP Options Configuration.
    ******************************************************************************
    * @attention
    *
    * Copyright (c) 2016 STMicroelectronics.
    * All rights reserved.
    *
    * This software is licensed under terms that can be found in the LICENSE file
    * in the root directory of this software component.
    * If no LICENSE file comes with this software, it is provided AS-IS.
    *
    ******************************************************************************
    */
  
  #ifndef __LWIPOPTS_H__
  #define __LWIPOPTS_H__
  
  /**
   * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
   * critical regions during buffer allocation, deallocation and memory
   * allocation and deallocation.
   */
  #define SYS_LIGHTWEIGHT_PROT    1
  
  /**
   * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
   * use lwIP facilities.
   */
  #define NO_SYS                  0
  
  /* ---------- Memory options ---------- */
  /* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
     lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
     byte alignment -> define MEM_ALIGNMENT to 2. */
  #define MEM_ALIGNMENT           4
  
  /* MEM_SIZE: the size of the heap memory. If the application will send
  a lot of data that needs to be copied, this should be set high. */
  #define MEM_SIZE                (5*1024)
  
  /* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
     sends a lot of data out of ROM (or other static memory), this
     should be set high. */
  #define MEMP_NUM_PBUF           10
  /* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
     per active UDP "connection". */
  #define MEMP_NUM_UDP_PCB        6
  /* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
     connections. */
  #define MEMP_NUM_TCP_PCB        10
  /* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
     connections. */
  #define MEMP_NUM_TCP_PCB_LISTEN 5
  /* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
     segments. */
  #define MEMP_NUM_TCP_SEG        12
  /* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
     timeouts. */
  #define MEMP_NUM_SYS_TIMEOUT    10
  
  
  /* ---------- Pbuf options ---------- */
  /* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
  #define PBUF_POOL_SIZE          10
  
  /* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
  #define PBUF_POOL_BUFSIZE       1524
  
  
  /* ---------- TCP options ---------- */
  #define LWIP_TCP                1
  #define TCP_TTL                 255
  
  /* Controls if TCP should queue segments that arrive out of
     order. Define to 0 if your device is low on memory. */
  #define TCP_QUEUE_OOSEQ         0
  
  /* TCP Maximum segment size. */
  #define TCP_MSS                 (1500 - 40)	  /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */
  
  /* TCP sender buffer space (bytes). */
  #define TCP_SND_BUF             (4*TCP_MSS)
  
  /*  TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
    as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */
  
  #define TCP_SND_QUEUELEN        (2* TCP_SND_BUF/TCP_MSS)
  
  /* TCP receive window. */
  #define TCP_WND                 (2*TCP_MSS)
  
  
  /* ---------- ICMP options ---------- */
  #define LWIP_ICMP                       1
  
  
  /* ---------- DHCP options ---------- */
  /* Define LWIP_DHCP to 1 if you want DHCP configuration of
     interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
     turning this on does currently not work. */
  #define LWIP_DHCP               1
  
  
  /* ---------- UDP options ---------- */
  #define LWIP_UDP                1
  #define UDP_TTL                 255
  
  
  /* ---------- Statistics options ---------- */
  #define LWIP_STATS 0
  
  /* ---------- link callback options ---------- */
  /* LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
   * whenever the link changes (i.e., link down)
   */
  #define LWIP_NETIF_LINK_CALLBACK        1
  
  /*
     --------------------------------------
     ---------- Checksum options ----------
     --------------------------------------
  */
  
  /* 
  The STM32F4x7 allows computing and verifying the IP, UDP, TCP and ICMP checksums by hardware:
   - To use this feature let the following define uncommented.
   - To disable it and process by CPU comment the  the checksum.
  */
  #define CHECKSUM_BY_HARDWARE 
  
  
  #ifdef CHECKSUM_BY_HARDWARE
    /* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP packets.*/
    #define CHECKSUM_GEN_IP                 0
    /* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP packets.*/
    #define CHECKSUM_GEN_UDP                0
    /* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP packets.*/
    #define CHECKSUM_GEN_TCP                0 
    /* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP packets.*/
    #define CHECKSUM_CHECK_IP               0
    /* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP packets.*/
    #define CHECKSUM_CHECK_UDP              0
    /* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP packets.*/
    #define CHECKSUM_CHECK_TCP              0
    /* CHECKSUM_CHECK_ICMP==0: Check checksums by hardware for incoming ICMP packets.*/  
    #define CHECKSUM_GEN_ICMP               0
  #else
    /* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.*/
    #define CHECKSUM_GEN_IP                 1
    /* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.*/
    #define CHECKSUM_GEN_UDP                1
    /* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.*/
    #define CHECKSUM_GEN_TCP                1
    /* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.*/
    #define CHECKSUM_CHECK_IP               1
    /* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.*/
    #define CHECKSUM_CHECK_UDP              1
    /* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.*/
    #define CHECKSUM_CHECK_TCP              1
    /* CHECKSUM_CHECK_ICMP==1: Check checksums by hardware for incoming ICMP packets.*/  
    #define CHECKSUM_GEN_ICMP               1
  #endif
  
  
  /*
     ----------------------------------------------
     ---------- Sequential layer options ----------
     ----------------------------------------------
  */
  /**
   * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
   */
  #define LWIP_NETCONN                    1
  
  /*
     ------------------------------------
     ---------- Socket options ----------
     ------------------------------------
  */
  /**
   * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
   */
  #define LWIP_SOCKET                     1
  
  
  /*
     ---------------------------------
     ---------- OS options ----------
     ---------------------------------
  */
  
  #define TCPIP_THREAD_NAME               "TCP/IP"
  #define TCPIP_THREAD_STACKSIZE          1000
  #define TCPIP_MBOX_SIZE                 6
  #define DEFAULT_UDP_RECVMBOX_SIZE       6
  #define DEFAULT_TCP_RECVMBOX_SIZE       6
  #define DEFAULT_ACCEPTMBOX_SIZE         6
  #define DEFAULT_THREAD_STACKSIZE        256
  #define TCPIP_THREAD_PRIO               (osPriorityBelowNormal)
  
  
  
  #endif /* __LWIPOPTS_H__ */
  
  