[应用相关] STM32 ENC28J60移植与入门

static err_t

low_level_output(struct netif *netif, struct pbuf *p)

{

  struct ethernetif *ethernetif = netif->state;

  struct pbuf *q;



  enc28j60_init_send(p->tot_len); //【1】initiate transfer();

 

#if ETH_PAD_SIZE

  pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */

#endif



  for(q = p; q != NULL; q = q->next) {

    /* Send the data from the pbuf to the interface, one pbuf at a

       time. The size of the data in each pbuf is kept in the ->len

       variable. */

    enc28j60_writebuf( q->payload, q->len ); //【2】send data from(q->payload, q->len);

  }



  enc28j60_start_send(); //【3】signal that packet should be sent();



#if ETH_PAD_SIZE

  pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */

#endif

 

  LINK_STATS_INC(link.xmit);



  return ERR_OK;

}

static struct pbuf *

low_level_input(struct netif *netif)

{

  struct ethernetif *ethernetif = netif->state;

  struct pbuf *p, *q;

  u16_t len;



  len = enc28j60_packet_getlen(); // 【1】



#if ETH_PAD_SIZE

  len += ETH_PAD_SIZE; /* allow room for Ethernet padding */

#endif



  /* We allocate a pbuf chain of pbufs from the pool. */

  p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);

 

  if (p != NULL) {



#if ETH_PAD_SIZE

    pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */

#endif



    for(q = p; q != NULL; q = q->next) {

      enc28j60_readbuf (q->payload, q->len ); //【2】read data into(q->payload, q->len);

    }

    enc28j60_finish_receive(); //【3】acknowledge that packet has been read();



#if ETH_PAD_SIZE

    pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */

#endif



    LINK_STATS_INC(link.recv);

  } else {

    enc28j60_finish_receive(); //【4】drop packet();

    LINK_STATS_INC(link.memerr);

    LINK_STATS_INC(link.drop);

  }



  return p;

}

#ifndef __LWIPOPTS_H__

#define __LWIPOPTS_H__



#define SYS_LIGHTWEIGHT_PROT 0



#define NO_SYS 1



#define NO_SYS_NO_TIMERS 1



/* ---------- 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 6

/* 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 3





/* ---------- 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 1500





/* ---------- 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 y**ice 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 (2*TCP_MSS)



/* TCP sender buffer space (pbufs). This must be at least = 2 *

   TCP_SND_BUF/TCP_MSS for things to work. */

#define TCP_SND_QUEUELEN (6 * 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 0



/* ---------- UDP options ---------- */

#define LWIP_UDP 1

#define UDP_TTL 255



/* ---------- Statistics options ---------- */

#define LWIP_STATS 0

#define LWIP_PROVIDE_ERRNO 1



/**

 * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)

 */

#define LWIP_NETCONN 0



/**

 * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)

 */

#define LWIP_SOCKET 0



#endif /* __LWIPOPTS_H__ */

void LwIP_Config (void)

{

    struct ip_addr ipaddr;

    struct ip_addr netmask;

    struct ip_addr gw;

   

    // 调用LWIP初始化函数

    lwip_init();

   

    IP4_ADDR(&ipaddr, 192, 168, 1, 16); // 设置网络接口的ip地址

    IP4_ADDR(&netmask, 255, 255, 255, 0);         // 子网掩码

    IP4_ADDR(&gw, 192, 168, 1, 1);         // 网关

   

    // 初始化enc28j60与LWIP的接口，参数为网络接口结构体、ip地址、

    // 子网掩码、网关、网卡信息指针、初始化函数、输入函数

    netif_add(&enc28j60, &ipaddr, &netmask, &gw, NULL, ðernetif_init, ðernet_input);

   

    // 把enc28j60设置为默认网卡

    netif_set_default(&enc28j60);

   

    netif_set_up(&enc28j60);

}

    timer_typedef tcp_timer, arp_timer;

   

    /* 设定查询定时器 ARP定时器 */

    timer_set(&tcp_timer, CLOCK_SECOND / 10); // tcp处理定时器 100ms

    timer_set(&arp_timer, CLOCK_SECOND * 5); // arp处理定时器 5s

    while (1) {

       

        if (enc28j60_packet_getcount() != 0) {

            ethernetif_input(&enc28j60);

        }

       

        // TCP 定时处理

        if (timer_expired(&tcp_timer)) {

            timer_set(&tcp_timer, CLOCK_SECOND / 4);

            tcp_tmr();

        }

       

        // ARP 定时处理

        if (timer_expired(&arp_timer)) {

            timer_set(&arp_timer, CLOCK_SECOND * 5);

            etharp_tmr();

        }

    }