電子發(fā)燒友App
LWIP是一款開源的嵌入式網(wǎng)絡協(xié)議棧，支持的功能很多，而且能在多任務環(huán)境下和單任務裸機環(huán)境下跑，今天說說他的移植過程，芯片為STM32，網(wǎng)卡為ENC28J60，無操作系統(tǒng)
首先下載LWIP的源代碼，我下載的是1.4.1的源碼，下載后解壓，文件結(jié)構(gòu)如圖
將這四個目錄中的文件全部拷貝到工程中，API是一些socket通訊的接口，需要在多任務的環(huán)境下實現(xiàn)，core里面存放的內(nèi)核源碼，我們主要使用IPV4，include目錄下是需要包含的目錄，lwip只要求我們包含include目錄，里面的內(nèi)層目錄會自動找到，最后建立的工程目錄如下
好了，此時源碼已經(jīng)做好，還有需要做的，在include目錄下新建一個文件夾，必須叫arch，里面存放這幾個文件，自己新建
文件的具體內(nèi)容如下
cc.h
/*
* Copyright （c） 2001-2003 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms， with or without modification，
* are permitted provided that the following conditions are met：
*
* 1. Redistributions of source code must retain the above copyright notice，
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice，
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS‘’ AND ANY EXPRESS OR IMPLIED
* WARRANTIES， INCLUDING， BUT NOT LIMITED TO， THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT， INDIRECT， INCIDENTAL， SPECIAL，
* EXEMPLARY， OR CONSEQUENTIAL DAMAGES （INCLUDING， BUT NOT LIMITED TO， PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE， DATA， OR PROFITS; OR BUSINESS
* INTERRUPTION） HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY， WHETHER IN
* CONTRACT， STRICT LIABILITY， OR TORT （INCLUDING NEGLIGENCE OR OTHERWISE） ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE， EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author： Adam Dunkels
*
*/
#ifndef __CC_H__
#define __CC_H__
#include “cpu.h”
//編譯器無關的數(shù)據(jù)類型定義
typedef unsigned char u8_t;
typedef signed char s8_t;
typedef unsigned short u16_t;
typedef signed short s16_t;
typedef unsigned long u32_t;
typedef signed long s32_t;
typedef u32_t mem_ptr_t;
typedef int sys_prot_t;
//lwip調(diào)試的時候數(shù)據(jù)類型定義
#define U16_F “hu”
#define S16_F “d”
#define X16_F “hx”
#define U32_F “u”
#define S32_F “d”
#define X32_F “x”
#define SZT_F “uz”
//根據(jù)不同的編譯器的符號定義
#if defined （__ICCARM__）
#define PACK_STRUCT_BEGIN
#define PACK_STRUCT_STRUCT
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD（x） x
#define PACK_STRUCT_USE_INCLUDES
#elif defined （__CC_ARM）
#define PACK_STRUCT_BEGIN __packed
#define PACK_STRUCT_STRUCT
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD（x） x
#elif defined （__GNUC__）
#define PACK_STRUCT_BEGIN
#define PACK_STRUCT_STRUCT __attribute__ （（__packed__））
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD（x） x
#elif defined （__TASKING__）
#define PACK_STRUCT_BEGIN
#define PACK_STRUCT_STRUCT
#define PACK_STRUCT_END
#define PACK_STRUCT_FIELD（x） x
#endif
#define LWIP_PLATFORM_ASSERT（x） //do { if（！（x）） while（1）; } while（0）
#endif /* __CC_H__ */
cpu.h
/*
* Copyright （c） 2001-2003 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms， with or without modification，
* are permitted provided that the following conditions are met：
*
* 1. Redistributions of source code must retain the above copyright notice，
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice，
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS‘’ AND ANY EXPRESS OR IMPLIED
* WARRANTIES， INCLUDING， BUT NOT LIMITED TO， THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT， INDIRECT， INCIDENTAL， SPECIAL，
* EXEMPLARY， OR CONSEQUENTIAL DAMAGES （INCLUDING， BUT NOT LIMITED TO， PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE， DATA， OR PROFITS; OR BUSINESS
* INTERRUPTION） HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY， WHETHER IN
* CONTRACT， STRICT LIABILITY， OR TORT （INCLUDING NEGLIGENCE OR OTHERWISE） ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE， EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author： Adam Dunkels
*
*/
#ifndef __CPU_H__
#define __CPU_H__
//定義cpu的數(shù)據(jù)模式，大端小端
#define BYTE_ORDER LITTLE_ENDIAN
#endif /* __CPU_H__ */
perf.h
#ifndef __PERF_H__
#define __PERF_H__
//用于lwip內(nèi)置的統(tǒng)計功能
//不使能定義為空就可以了
#define PERF_START /* null definition */
#define PERF_STOP（x） /* null definition */
#endif /* __PERF_H__ */
sys_arch.h
#ifndef __SYS_RTXC_H__
#define __SYS_RTXC_H__
void init_lwip_timer（void）; //初始化LWIP定時器
u8_t timer_expired（u32_t *last_time，u32_t tmr_interval）; //定時器超時判斷
#endif /* __SYS_RTXC_H__ */
sya_arch.c--注意該文件要加入源文件列表中，這是c文件哦
#include “l(fā)wip/debug.h”
#include “l(fā)wip/def.h”
#include “l(fā)wip/sys.h”
#include “l(fā)wip/mem.h”
#include “timerx.h”
//初始化LWIP定時器
void init_lwip_timer（void）
{
TIM6_Int_Init（1000，719）;//100Khz計數(shù)頻率，計數(shù)到100為10ms
}
//為LWIP提供計時
extern u32_t lwip_timer;//lwip 計時器，每10ms增加1.
u32_t sys_now（void）
{
return lwip_timer;
}
//定時器超時判斷
//last_time：最近時間
//tmr_interval：定時器溢出周期
u8_t timer_expired（u32_t *last_time，u32_t tmr_interval）
{
u32_t time;
time = *last_time;
if（（lwip_timer-time）》=tmr_interval）{
*last_time = lwip_timer;
return 1;
}
return 0;
}
可以看到我們定義了定時器，那么就要修改相關的定時器文件，文件如下
timerx.c
#include “timerx.h”
u32 lwip_timer=0;//lwip 計時器，每10ms增加1.
//定時器6中斷服務程序
void TIM6_IRQHandler（void）
{
if （TIM_GetITStatus（TIM6， TIM_IT_Update） ！= RESET） //檢查指定的TIM中斷發(fā)生與否：TIM 中斷源
{
TIM_ClearITPendingBit（TIM6， TIM_IT_Update ）; //清除TIMx的中斷待處理位：TIM 中斷源
lwip_timer++;//lwip計時器增加1
}
}
//基本定時器6中斷初始化
//這里時鐘選擇為APB1的2倍，而APB1為36M
//arr：自動重裝值。
//psc：時鐘預分頻數(shù)
//這里使用的是定時器3！
void TIM6_Int_Init（u16 arr，u16 psc）
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd（RCC_APB1Periph_TIM6， ENABLE）; //時鐘使能
TIM_TimeBaseStructure.TIM_Period = arr; //設置在下一個更新事件裝入活動的自動重裝載寄存器周期的值 計數(shù)到5000為500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設置用來作為TIMx時鐘頻率除數(shù)的預分頻值 10Khz的計數(shù)頻率
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設置時鐘分割：TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數(shù)模式
TIM_TimeBaseInit（TIM6， &TIM_TimeBaseStructure）; //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時間基數(shù)單位
TIM_ITConfig（ TIM6，TIM_IT_Update“TIM_IT_Trigger，ENABLE）;//使能定時器6更新觸發(fā)中斷
TIM_Cmd（TIM6， ENABLE）; //使能TIMx外設
NVIC_InitStructure.NVIC_IRQChannel = TIM6_IRQn; //TIM3中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //先占優(yōu)先級0級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //從優(yōu)先級3級
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init（&NVIC_InitStructure）; //根據(jù)NVIC_InitStruct中指定的參數(shù)初始化外設NVIC寄存器
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