317 lines
9.7 KiB
C
317 lines
9.7 KiB
C
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/**
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* @file
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* Ethernet Interface for standalone applications (without RTOS)
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*
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/**一下内容基于GD官方例程修改**/
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#include "lwip/mem.h"
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#include "gd32f4xx_enet.h"
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#include <string.h>
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#include "common.h"
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#include "lwip/opt.h"
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#include <string.h>
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#include "lwip/pbuf.h"
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#include <lwip/stats.h>
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#include <lwip/snmp.h>
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#include "netif/etharp.h"
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#include "netif/ppp_oe.h"
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#include "Lan8720.h"
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/* network interface name */
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#define IFNAME0 'G'
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#define IFNAME1 'D'
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/* ENET RxDMA/TxDMA descriptor */
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extern enet_descriptors_struct rxdesc_tab[ENET_RXBUF_NUM], txdesc_tab[ENET_TXBUF_NUM];
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/* ENET receive buffer */
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extern uint8_t rx_buff[ENET_RXBUF_NUM][ENET_RXBUF_SIZE];
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/* ENET transmit buffer */
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extern uint8_t tx_buff[ENET_TXBUF_NUM][ENET_TXBUF_SIZE];
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/*global transmit and receive descriptors pointers */
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extern enet_descriptors_struct *dma_current_txdesc;
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extern enet_descriptors_struct *dma_current_rxdesc;
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/* preserve another ENET RxDMA/TxDMA ptp descriptor for normal mode */
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enet_descriptors_struct ptp_txstructure[ENET_TXBUF_NUM];
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enet_descriptors_struct ptp_rxstructure[ENET_RXBUF_NUM];
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//extern unsigned char gCfgLoca_MAC[] = {0x02, 0x0A, 0x0D, 0x0E, 0x0F, 0x06};
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/**
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* In this function, the hardware should be initialized.
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* Called from ethernetif_init().
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*
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* @param netif the already initialized lwip network interface structure
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* for this ethernetif
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*/
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static void low_level_init(struct netif *netif)
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{
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#ifdef CHECKSUM_BY_HARDWARE
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int i;
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#endif /* CHECKSUM_BY_HARDWARE */
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/* set MAC hardware address length */
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netif->hwaddr_len = ETHARP_HWADDR_LEN;
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/* set MAC hardware address */
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netif->hwaddr[0] = gCfgLoca_MAC[0];
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netif->hwaddr[1] = gCfgLoca_MAC[1];
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netif->hwaddr[2] = gCfgLoca_MAC[2];
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netif->hwaddr[3] = gCfgLoca_MAC[3];
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netif->hwaddr[4] = gCfgLoca_MAC[4];
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netif->hwaddr[5] = gCfgLoca_MAC[5];
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/* initialize MAC address in ethernet MAC */
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enet_mac_address_set(ENET_MAC_ADDRESS0, netif->hwaddr);
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/* maximum transfer unit */
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netif->mtu = 1500;
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/* device capabilities */
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/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
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netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
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/* initialize descriptors list: chain/ring mode */
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#ifdef SELECT_DESCRIPTORS_ENHANCED_MODE
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enet_ptp_enhanced_descriptors_chain_init(ENET_DMA_TX);
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enet_ptp_enhanced_descriptors_chain_init(ENET_DMA_RX);
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#else
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enet_descriptors_chain_init(ENET_DMA_TX);
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enet_descriptors_chain_init(ENET_DMA_RX);
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// enet_descriptors_ring_init(ENET_DMA_TX);
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// enet_descriptors_ring_init(ENET_DMA_RX);
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#endif /* SELECT_DESCRIPTORS_ENHANCED_MODE */
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/* enable ethernet Rx interrrupt */
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{ int i;
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for(i=0; i<ENET_RXBUF_NUM; i++){
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enet_rx_desc_immediate_receive_complete_interrupt(&rxdesc_tab[i]);
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}
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}
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#ifdef CHECKSUM_BY_HARDWARE
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/* enable the TCP, UDP and ICMP checksum insertion for the Tx frames */
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for(i=0; i < ENET_TXBUF_NUM; i++){
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enet_transmit_checksum_config(&txdesc_tab[i], ENET_CHECKSUM_TCPUDPICMP_FULL);
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}
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#endif /* CHECKSUM_BY_HARDWARE */
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/* note: TCP, UDP, ICMP checksum checking for received frame are enabled in DMA config */
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/* enable MAC and DMA transmission and reception */
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enet_enable();
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}
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/**
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* This function should do the actual transmission of the packet. The packet is
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* contained in the pbuf that is passed to the function. This pbuf
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* might be chained.
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
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* @return ERR_OK if the packet could be sent
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* an err_t value if the packet couldn't be sent
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*
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* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
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* strange results. You might consider waiting for space in the DMA queue
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* to become availale since the stack doesn't retry to send a packet
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* dropped because of memory failure (except for the TCP timers).
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*/
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static err_t low_level_output(struct netif *netif, struct pbuf *p)
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{
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struct pbuf *q;
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int framelength = 0;
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uint8_t *buffer;
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while((uint32_t)RESET != (dma_current_txdesc->status & ENET_TDES0_DAV)){
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}
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buffer = (uint8_t *)(enet_desc_information_get(dma_current_txdesc, TXDESC_BUFFER_1_ADDR));
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/* copy frame from pbufs to driver buffers */
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for(q = p; q != NULL; q = q->next){
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memcpy((uint8_t *)&buffer[framelength], q->payload, q->len);
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framelength = framelength + q->len;
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}
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/* note: padding and CRC for transmitted frame
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are automatically inserted by DMA */
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/* transmit descriptors to give to DMA */
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#ifdef SELECT_DESCRIPTORS_ENHANCED_MODE
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ENET_NOCOPY_PTPFRAME_TRANSMIT_ENHANCED_MODE(framelength, NULL);
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#else
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ENET_NOCOPY_FRAME_TRANSMIT(framelength);
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#endif /* SELECT_DESCRIPTORS_ENHANCED_MODE */
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return ERR_OK;
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}
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/**
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* Should allocate a pbuf and transfer the bytes of the incoming
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* packet from the interface into the pbuf.
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return a pbuf filled with the received packet (including MAC header)
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* NULL on memory error
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*/
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static struct pbuf * low_level_input(struct netif *netif)
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{
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struct pbuf *p, *q;
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u16_t len;
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int l =0;
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uint8_t *buffer;
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p = NULL;
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/* obtain the size of the packet and put it into the "len" variable. */
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len = enet_desc_information_get(dma_current_rxdesc, RXDESC_FRAME_LENGTH);
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buffer = (uint8_t *)(enet_desc_information_get(dma_current_rxdesc, RXDESC_BUFFER_1_ADDR));
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/* we allocate a pbuf chain of pbufs from the Lwip buffer pool */
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p = pbuf_alloc(PBUF_RAW, len + 5, PBUF_POOL);
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/* copy received frame to pbuf chain */
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if (p != NULL){
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for (q = p; q != NULL; q = q->next){
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memcpy((uint8_t *)q->payload, (u8_t*)&buffer[l], q->len);
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l = l + q->len;
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}
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}
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#ifdef SELECT_DESCRIPTORS_ENHANCED_MODE
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ENET_NOCOPY_PTPFRAME_RECEIVE_ENHANCED_MODE(NULL);
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#else
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ENET_NOCOPY_FRAME_RECEIVE();
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#endif /* SELECT_DESCRIPTORS_ENHANCED_MODE */
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return p;
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}
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/**
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* This function should be called when a packet is ready to be read
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* from the interface. It uses the function low_level_input() that
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* should handle the actual reception of bytes from the network
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* interface. Then the type of the received packet is determined and
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* the appropriate input function is called.
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*
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* @param netif the lwip network interface structure for this ethernetif
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*/
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err_t ethernetif_input(struct netif *netif)
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{
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err_t err;
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struct pbuf *p;
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/* move received packet into a new pbuf */
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p = low_level_input(netif);
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/* no packet could be read, silently ignore this */
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if (p == NULL) return ERR_MEM;
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/* entry point to the LwIP stack */
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err = netif->input(p, netif);
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if (err != ERR_OK){
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LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
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pbuf_free(p);
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p = NULL;
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}
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return err;
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}
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/**
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* Should be called at the beginning of the program to set up the
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* network interface. It calls the function low_level_init() to do the
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* actual setup of the hardware.
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*
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* This function should be passed as a parameter to netif_add().
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*
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* @param netif the lwip network interface structure for this ethernetif
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* @return ERR_OK if the loopif is initialized
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* ERR_MEM if private data couldn't be allocated
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* any other err_t on error
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*/
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err_t ethernetif_init(struct netif *netif)
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{
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LWIP_ASSERT("netif != NULL", (netif != NULL));
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#if LWIP_NETIF_HOSTNAME
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/* Initialize interface hostname */
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netif->hostname = "Gigadevice.COM_lwip";
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#endif /* LWIP_NETIF_HOSTNAME */
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netif->name[0] = IFNAME0;
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netif->name[1] = IFNAME1;
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/* We directly use etharp_output() here to save a function call.
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* You can instead declare your own function an call etharp_output()
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* from it if you have to do some checks before sending (e.g. if link
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* is available...) */
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netif->output = etharp_output;
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netif->linkoutput = low_level_output;
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/* initialize the hardware */
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low_level_init(netif);
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return ERR_OK;
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}
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