STM32407+LWIP+EC20 PPP拨号流程

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我是靠谱客的博主迷路皮带，最近开发中收集的这篇文章主要介绍STM32407+LWIP+EC20 PPP拨号流程，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

先初始化EC20 主要有以下AT指令可以根据需要增加注意LWIP+EC20 PPP 只能使用软件检验

所以不能打开 CHECKSUM_BY_HARDWARE 这个宏定义

"+++" //退出透传模式

"ATE0rn" //关掉回显

"AT+CPIN?rn" //查询SIM卡的状态

"AT+CSQrn" //Signal Quality Report 检查网络信号强度和SIM卡情况

"AT+CREG?rn" //查询网络注册信息

"AT+CGREG?rn" //查询无线分组业务

"AT+QIACT?rn" //获取本地IP地址 contextID=1

"AT+QIACT=1rn" //Activate a PDP Context 激活移动场景contextID=1

"AT+CGSNrn" //Query IMEI

"AT+QCCIDrn" //Query CCID

LWIP PPP初始化流程如下

u8 lwip_PPP_comm_init(void)
{
   uint8_t ctx = 0;
   while(EC20_status_check())
   {
       sys_msleep(1000);
       ctx = 0;
   }
   EC20_PPP(); //"ATD*99#rn"
   ppp_modle=1;

   tcpip_init(NULL,NULL);
   netif_set_status_callback(&lwip_netif, netif_status_callback);
   netif_set_link_callback(&lwip_netif, netif_link_callback);
   netif_set_remove_callback(&lwip_netif, netif_remove_callback);
   ppp = pppos_create( &lwip_netif, output_cb, status_cb, &ctx );
   sys_thread_new("PppRead", PppRead, NULL, 1024, LWIP_GETDATA_TASK_PRIO);

   if( ppp_connect(ppp, 0) != ERR_OK )
   {
       while(1)
       {
sys_msleep(1000);
       }
   }

ppp_set_default(ppp);
return ctx;
}

EC20_status_check 是EC20初始化和状态检测

EC20_PPP(); //"ATD*99#rn"

uint32_t output_cb(ppp_pcb *pcb, uint8_t *data, uint32_t len, void *ctx) 写数据

uint32_t output_cb(ppp_pcb *pcb, uint8_t *data, uint32_t len, void *ctx) {
   if(ppp_modle)
   {
//往串口发送数据
   }
   return 0;
}

void status_cb(ppp_pcb *pcb, int err_code, void *ctx) 状态改变回调函数使用LWIP文档提供的示例

void status_cb(ppp_pcb *pcb, int err_code, void *ctx) {
struct netif *pppif = ppp_netif(pcb);
LWIP_UNUSED_ARG(ctx);

switch(err_code) {
case PPPERR_NONE: {
#if LWIP_DNS
const ip_addr_t *ns;
#endif /* LWIP_DNS */
PPP_PRINT("status_cb: Connectedn");
#if PPP_IPV4_SUPPORT
PPP_PRINT(" our_ipaddr = %sn", ipaddr_ntoa(&pppif->ip_addr));
PPP_PRINT(" his_ipaddr = %sn", ipaddr_ntoa(&pppif->gw));
PPP_PRINT(" netmask = %sn", ipaddr_ntoa(&pppif->netmask));
ppp_conn_success = 1;
#if LWIP_DNS
ns = (ip_addr_t*)dns_getserver(0);
PPP_PRINT(" dns1 = %sn", ipaddr_ntoa(ns));
ns = (ip_addr_t*)dns_getserver(1);
PPP_PRINT(" dns2 = %sn", ipaddr_ntoa(ns));
ns = ns;
pppif = pppif;
#endif /* LWIP_DNS */
#endif /* PPP_IPV4_SUPPORT */
#if PPP_IPV6_SUPPORT
PPP_PRINT(" our6_ipaddr = %sn", ip6addr_ntoa(netif_ip6_addr(pppif, 0)));
#endif /* PPP_IPV6_SUPPORT */
break;
}
case PPPERR_PARAM: {
PPP_PRINT("status_cb: Invalid parametern");
break;
}
case PPPERR_OPEN: {
PPP_PRINT("status_cb: Unable to open PPP sessionn");
break;
}
case PPPERR_DEVICE: {
PPP_PRINT("status_cb: Invalid I/O device for PPPn");
break;
}
case PPPERR_ALLOC: {
PPP_PRINT("status_cb: Unable to allocate resourcesn");
break;
}
case PPPERR_USER: {
PPP_PRINT("status_cb: User interruptn");
break;
}
case PPPERR_CONNECT: {
PPP_PRINT("status_cb: Connection lostn");
break;
}
case PPPERR_AUTHFAIL: {
PPP_PRINT("status_cb: Failed authentication challengen");
break;
}
case PPPERR_PROTOCOL: {
PPP_PRINT("status_cb: Failed to meet protocoln");
break;
}
case PPPERR_PEERDEAD: {
PPP_PRINT("status_cb: Connection timeoutn");
break;
}
case PPPERR_IDLETIMEOUT: {
PPP_PRINT("status_cb: Idle Timeoutn");
break;
}
case PPPERR_CONNECTTIME: {
PPP_PRINT("status_cb: Max connect time reachedn");
break;
}
case PPPERR_LOOPBACK: {
PPP_PRINT("status_cb: Loopback detectedn");
break;
}
default: {
PPP_PRINT("status_cb: Unknown error code %dn", err_code);
break;
}
}

/*
* This should be in the switch case, this is put outside of the switch
* case for example readability.
*/

if (err_code == PPPERR_NONE) {
return;
}

/* ppp_close() was previously called, don't reconnect */
if (err_code == PPPERR_USER) {
/* ppp_free(); -- can be called here */
return;
}
ppp_conn_success = 0;
/*
* Try to reconnect in 30 seconds, if you need a modem chatscript you have
* to do a much better signaling here ;-)
*/
ppp_connect(pcb, 30);
/* OR ppp_listen(pcb); */
}

void PppRead( void * argument ) 读取串口数据给LWIP内核

void PppRead( void * argument )
{
   uint8_t Readbuf[512];
   uint32_t recv_size,timeout=0;
   while(1)
   {
       if( ppp )
       {
           recv_size =0;
           if(ppp_modle)
           {
               recv_size = uart_ReadData(Readbuf,sizeof(Readbuf));
               if( recv_size)
               {
  pppos_input_tcpip(ppp, Readbuf, recv_size );//0x7e
               }