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介绍一下STM32F107以太网的配置和移植RL-TCPnet协议栈，官方所给的例程为lwip，这里介绍一下怎样使用RL-TCPnet。（需要包含stm32_eth.c和stm32_eth.h）
这里是描述符的定义，什么是描述符请看《STM32中文参考手册》以太网章节
/* 描述符数量和缓存大小定义 */
#define NUM_RX_BUF 4 //接收描述符数量和缓存数量
#define NUM_TX_BUF 2 //发送描述符数量和缓存数量
#define ETH_BUF_SIZE 1536 //每个缓存大小
/* 接收描述符和发送描述符结构体类型定义（含义请参考STM32中文参考手册） */
typedef struct {
U32 volatile Stat;
U32 Ctrl;
U32 Addr;
U32 Next;
} RX_Desc;
typedef struct {
U32 volatile CtrlStat;
U32 Size;
U32 Addr;
U32 Next;
} TX_Desc;
/* 当前使用的描述符序号 */
static U8 TxBufIndex;
static U8 RxBufIndex;
/* DMA描述符声明 */
static RX_Desc Rx_Desc[NUM_RX_BUF];
static TX_Desc Tx_Desc[NUM_TX_BUF];
/* 描述符所指向的内存 */
static U32 rx_buf[NUM_RX_BUF][ETH_BUF_SIZE>>2];
static U32 tx_buf[NUM_TX_BUF][ETH_BUF_SIZE>>2];
要使用RL-TCPnet协议栈需要为RL-TCPnet提供接口函数：
void init_ethernet (void);
void send_frame (OS_FRAME *frame);
void int_enable_eth (void);
void int_disable_eth (void);
以下为对应函数：
//以太网硬件初始化（提供给RL-TCPnet的接口）
void init_ethernet (void) {
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
ETH_InitTypeDef ETH_InitStructure;
#define TIME_OUT 0x0003FFFFul
uint32_t time = 0;
/* 使能时钟 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ETH_MAC | RCC_AHBPeriph_ETH_MAC_Tx |
RCC_AHBPeriph_ETH_MAC_Rx, ENABLE);
/* 使能GPIO时钟 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC |
RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO,
ENABLE);
/* 选择中断向量表 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
/* 使能以太网全局中断*/
NVIC_InitStructure.NVIC_IRQChannel = ETH_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/*
以太网引脚配置
当前使用RMII接口，无重映射
需要使用MII接口请自行参照手册修改
*/
/* AF Output Push Pull:
-ETH_RMII_MDIO: PA2
-ETH_RMII_MDC: PC1
-ETH_RMII_TX_EN: PB11
-ETH_RMII_TXD0: PB12
-ETH_RMII_TXD1: PB13
*/
/* Configure PA2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure PC1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure PB5, PB8, PB11, PB12 and PB13 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Input:
-ETH_RMII_REF_CLK: PA1
-ETH_RMII_CRS_DV: PA7
-ETH_RMII_RXD0: PC4
-ETH_RMII_RXD1: PC5
*/
/* Configure PA1 and PA7 as input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure PC4 and PC5 as input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* 选择配置为MII或者RMII，当前为RMII*/
GPIO_ETH_MediaInterfaceConfig(GPIO_ETH_MediaInterface_RMII);
/* 重置以太网 */
ETH_DeInit();
ETH_SoftwareReset();
/*等待重置完成*/
while (ETH_GetSoftwareResetStatus() == SET);
/* 以太网配置， 填充ETH_InitStructure结构体，最后调用 ETH_Init()配置以太网*/
ETH_StructInit(Ð_InitStructure);
/*------------------------ MAC -----------------------------------*/
ETH_InitStructure.ETH_AutoNegotiation = ETH_AutoNegotiation_Enable ;
ETH_InitStructure.ETH_LoopbackMode = ETH_LoopbackMode_Disable;
ETH_InitStructure.ETH_RetryTransmission = ETH_RetryTransmission_Disable;
ETH_InitStructure.ETH_AutomaticPadCRCStrip = ETH_AutomaticPadCRCStrip_Disable;
ETH_InitStructure.ETH_ReceiveAll = ETH_ReceiveAll_Disable;
ETH_InitStructure.ETH_BroadcastFramesReception = ETH_BroadcastFramesReception_Enable;
ETH_InitStructure.ETH_PromiscuousMode = ETH_PromiscuousMode_Disable;
ETH_InitStructure.ETH_MulticastFramesFilter = ETH_MulticastFramesFilter_Perfect;
ETH_InitStructure.ETH_UnicastFramesFilter = ETH_UnicastFramesFilter_Perfect;
#ifdef CHECKSUM_BY_HARDWARE
ETH_InitStructure.ETH_ChecksumOffload = ETH_ChecksumOffload_Enable;
#endif
/*------------------------ DMA -----------------------------------*/
ETH_InitStructure.ETH_DropTCPIPChecksumErrorFrame = ETH_DropTCPIPChecksumErrorFrame_Enable;
ETH_InitStructure.ETH_ReceiveStoreForward = ETH_ReceiveStoreForward_Enable;
ETH_InitStructure.ETH_TransmitStoreForward = ETH_TransmitStoreForward_Enable;
ETH_InitStructure.ETH_ForwardErrorFrames = ETH_ForwardErrorFrames_Disable;
ETH_InitStructure.ETH_ForwardUndersizedGoodFrames = ETH_ForwardUndersizedGoodFrames_Disable;
ETH_InitStructure.ETH_SecondFrameOperate = ETH_SecondFrameOperate_Enable;
ETH_InitStructure.ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable;
ETH_InitStructure.ETH_FixedBurst = ETH_FixedBurst_Enable;
ETH_InitStructure.ETH_RxDMABurstLength = ETH_RxDMABurstLength_32Beat;
ETH_InitStructure.ETH_TxDMABurstLength = ETH_TxDMABurstLength_32Beat;
ETH_InitStructure.ETH_DMAArbitration = ETH_DMAArbitration_RoundRobin_RxTx_2_1;
/*初始化以太网，第二个参数为PHY芯片地址*/
ETH_Init(Ð_InitStructure, LAN9303_VPHY_ADDR);
//接收描述符初始化
rx_descr_init();
//发送描述符初始化
tx_descr_init();
/* 使能正常总中断和接收中断*/
ETH_DMAITConfig(ETH_DMA_IT_NIS | ETH_DMA_IT_R, ENABLE);
//使能发送和接收
ETH->DMAOMR |= DOMR_ST | DOMR_SR;
ETH->MACCR |= MCR_RE | MCR_TE;
//配置MAC地址，否则只能收到广播数据
ETH_MACAddressConfig(ETH_MAC_Address0, own_hw_adr);
}
//使能和禁止以太网中断
void int_enable_eth (void) {
/* Ethernet Interrupt Enable function. */
NVIC->ISER[1] = 1 << 29;
}
void int_disable_eth (void) {
/* Ethernet Interrupt Disable function. */
NVIC->ICER[1] = 1 << 29;
}
//发送一帧数据（提供给RL-TCPnet的接口函数）
void send_frame (OS_FRAME *frame) {
U32 *sp,*dp;
U32 i,j;
j = TxBufIndex;
/* 等待之前数据发送完 */
while (Tx_Desc[j].CtrlStat & DMA_TX_OWN);
sp =** (U32 *)&frame->data[0];
dp = (U32 *)Tx_Desc[j].Addr;
/* 拷贝需要发送的数据到发送描述符指定的内存 */
for (i = (frame->length + 3) >> 2; i; i--) {
*dp++ = *sp++;
}
//发送数据量
Tx_Desc[j].Size = frame->length;
//修改发送描述符属于DMA
Tx_Desc[j].CtrlStat |= DMA_TX_OWN;
/* 往DMATPDR中写数据开始DMA传输 */
if((ETH->DMASR | DSR_TBUS) !*= 0)
{
ETH->DMASR = DSR_TBUS;
ETH->DMATPDR = 0;
}
if (++j == NUM_TX_BUF) j = 0;
TxBufIndex = j;
}
以上即为需要提供给RL-TCPnet的接口函数。
中断服务函数，用于接收以太网数据。
//以太网中断服务函数（用于接收以太网数据）
void ETH_IRQHandler (void) {
/* Ethernet Controller Interrupt function. */
OS_FRAME *frame;
U32 i,RxLen;
U32 *sp,*dp;
i = RxBufIndex;
do {
/* Valid frame has been received. */*
if (Rx_Desc[i].Stat & DMA_RX_ERROR_MASK) {
goto rel;
}
if ((Rx_Desc[i].Stat & DMA_RX_SEG_MASK) != DMA_RX_SEG_MASK) {
goto rel;
}
RxLen = ((Rx_Desc[i].Stat >> 16) & 0x3FFF) - 4;
if (RxLen > ETH_MTU) {
/* Packet too big, ignore it and free buffer. */
goto rel;
}
/* Flag 0x80000000 to skip sys_error() call when out of memory. */
frame = alloc_mem (RxLen | 0x80000000);
/* if 'alloc_mem()' has failed, ignore this packet. */
if (frame != NULL) {
sp = (U32 *)(Rx_Desc[i].Addr & ~3);
dp = (U32 *)&frame->data[0];
for (RxLen = (RxLen + 3) >> 2; RxLen; RxLen--) {
*dp++ = *sp++;
}
put_in_queue (frame);
}
/* Release this frame from ETH IO buffer. */
rel:
Rx_Desc[i].Stat = DMA_RX_OWN;
if (++i == NUM_RX_BUF) i = 0;
}
while ((Rx_Desc[i].Stat & DMA_RX_OWN) == 0);
RxBufIndex = i;
if (ETH->DMASR & INT_RBUIE) {
/* Rx DMA suspended, resume DMA reception. */
ETH->DMASR = INT_RBUIE;
ETH->DMARPDR = 0;
}
/* Clear the interrupt pending bits. */
ETH->DMASR = INT_NISE | INT_RIE;
}
接收描述符初始化
//接收描述符初始化
static void rx_descr_init (void) {
/* Initialize Receive DMA Descriptor array. */
U32 i,next;
RxBufIndex = 0;
for (i = 0, next = 0; i < NUM_RX_BUF; i++) {
if (++next == NUM_RX_BUF) next = 0;
Rx_Desc[i].Stat = DMA_RX_OWN;
Rx_Desc[i].Ctrl = DMA_RX_RCH | ETH_BUF_SIZE;
Rx_Desc[i].Addr = (U32)&rx_buf[i];
Rx_Desc[i].Next = (U32)&Rx_Desc[next];
}
//指向第一个描述符
ETH->DMARDLAR = (U32)&Rx_Desc[0];
}
发送描述符初始化
//发送描述符初始化
static void tx_descr_init (void) {
/* Initialize Transmit DMA Descriptor array. */
U32 i,next;
TxBufIndex = 0;
for (i = 0, next = 0; i < NUM_TX_BUF; i++) {
if (++next == NUM_TX_BUF) next = 0;
Tx_Desc[i].CtrlStat = DMA_TX_TCH | DMA_TX_LS | DMA_TX_FS;
Tx_Desc[i].Addr = (U32)&tx_buf[i];
Tx_Desc[i].Next = (U32)&Tx_Desc[next];
}
//指向第一个描述符
ETH->DMATDLAR = (U32)&Tx_Desc[0];
}
到此，在工程中加入RL-TCPnet库和配置文件即可使用RL-TCPnet，使用方法请参照RL-arm帮助文档。