365 lines
12 KiB
C
365 lines
12 KiB
C
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/**
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* @file
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* Ethernet Interface for standalone applications (without RTOS) - works only for
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* ethernet polling mode (polling for ethernet frame reception)
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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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#include "lwip/opt.h"
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#include "lwip/mem.h"
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#include "netif/etharp.h"
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#include "ethernetif.h"
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#include "stm32f4x7_eth.h"
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#include "main.h"
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#include <string.h>
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/* Network interface name */
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#define IFNAME0 's'
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#define IFNAME1 't'
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/* Ethernet Rx & Tx DMA Descriptors */
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extern ETH_DMADESCTypeDef DMARxDscrTab[ETH_RXBUFNB], DMATxDscrTab[ETH_TXBUFNB];
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/* Ethernet Driver Receive buffers */
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extern uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE];
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/* Ethernet Driver Transmit buffers */
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extern uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE];
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/* Global pointers to track current transmit and receive descriptors */
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extern ETH_DMADESCTypeDef *DMATxDescToSet;
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extern ETH_DMADESCTypeDef *DMARxDescToGet;
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/* Global pointer for last received frame infos */
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extern ETH_DMA_Rx_Frame_infos *DMA_RX_FRAME_infos;
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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
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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] = MAC_ADDR0;
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netif->hwaddr[1] = MAC_ADDR1;
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netif->hwaddr[2] = MAC_ADDR2;
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netif->hwaddr[3] = MAC_ADDR3;
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netif->hwaddr[4] = MAC_ADDR4;
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netif->hwaddr[5] = MAC_ADDR5;
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/* initialize MAC address in ethernet MAC */
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ETH_MACAddressConfig(ETH_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;
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/* Initialize Tx Descriptors list: Chain Mode */
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ETH_DMATxDescChainInit(DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB);
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/* Initialize Rx Descriptors list: Chain Mode */
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ETH_DMARxDescChainInit(DMARxDscrTab, &Rx_Buff[0][0], ETH_RXBUFNB);
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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<ETH_TXBUFNB; i++)
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{
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ETH_DMATxDescChecksumInsertionConfig(&DMATxDscrTab[i], ETH_DMATxDesc_ChecksumTCPUDPICMPFull);
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}
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#endif
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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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ETH_Start();
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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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err_t errval;
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struct pbuf *q;
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u8 *buffer = (u8 *)(DMATxDescToSet->Buffer1Addr);
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__IO ETH_DMADESCTypeDef *DmaTxDesc;
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uint16_t framelength = 0;
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uint32_t bufferoffset = 0;
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uint32_t byteslefttocopy = 0;
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uint32_t payloadoffset = 0;
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DmaTxDesc = DMATxDescToSet;
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bufferoffset = 0;
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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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{
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/* Is this buffer available? If not, goto error */
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if((DmaTxDesc->Status & ETH_DMATxDesc_OWN) != (u32)RESET)
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{
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errval = ERR_BUF;
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goto error;
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}
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/* Get bytes in current lwIP buffer */
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byteslefttocopy = q->len;
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payloadoffset = 0;
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/* Check if the length of data to copy is bigger than Tx buffer size*/
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while( (byteslefttocopy + bufferoffset) > ETH_TX_BUF_SIZE )
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{
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/* Copy data to Tx buffer*/
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memcpy( (u8_t*)((u8_t*)buffer + bufferoffset), (u8_t*)((u8_t*)q->payload + payloadoffset), (ETH_TX_BUF_SIZE - bufferoffset) );
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/* Point to next descriptor */
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DmaTxDesc = (ETH_DMADESCTypeDef *)(DmaTxDesc->Buffer2NextDescAddr);
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/* Check if the buffer is available */
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if((DmaTxDesc->Status & ETH_DMATxDesc_OWN) != (u32)RESET)
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{
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errval = ERR_USE;
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goto error;
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}
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buffer = (u8 *)(DmaTxDesc->Buffer1Addr);
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byteslefttocopy = byteslefttocopy - (ETH_TX_BUF_SIZE - bufferoffset);
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payloadoffset = payloadoffset + (ETH_TX_BUF_SIZE - bufferoffset);
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framelength = framelength + (ETH_TX_BUF_SIZE - bufferoffset);
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bufferoffset = 0;
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}
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/* Copy the remaining bytes */
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memcpy( (u8_t*)((u8_t*)buffer + bufferoffset), (u8_t*)((u8_t*)q->payload + payloadoffset), byteslefttocopy );
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bufferoffset = bufferoffset + byteslefttocopy;
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framelength = framelength + byteslefttocopy;
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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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/* Prepare transmit descriptors to give to DMA*/
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ETH_Prepare_Transmit_Descriptors(framelength);
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errval = ERR_OK;
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error:
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/* When Transmit Underflow flag is set, clear it and issue a Transmit Poll Demand to resume transmission */
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if ((ETH->DMASR & ETH_DMASR_TUS) != (uint32_t)RESET)
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{
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/* Clear TUS ETHERNET DMA flag */
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ETH->DMASR = ETH_DMASR_TUS;
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/* Resume DMA transmission*/
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ETH->DMATPDR = 0;
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}
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return errval;
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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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uint32_t len;
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FrameTypeDef frame;
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u8 *buffer;
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__IO ETH_DMADESCTypeDef *DMARxDesc;
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uint32_t bufferoffset = 0;
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uint32_t payloadoffset = 0;
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uint32_t byteslefttocopy = 0;
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uint32_t i=0;
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/* get received frame */
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frame = ETH_Get_Received_Frame();
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/* Obtain the size of the packet and put it into the "len" variable. */
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len = frame.length;
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buffer = (u8 *)frame.buffer;
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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, PBUF_POOL);
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if (p != NULL)
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{
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DMARxDesc = frame.descriptor;
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bufferoffset = 0;
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for(q = p; q != NULL; q = q->next)
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{
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byteslefttocopy = q->len;
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payloadoffset = 0;
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/* Check if the length of bytes to copy in current pbuf is bigger than Rx buffer size*/
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while( (byteslefttocopy + bufferoffset) > ETH_RX_BUF_SIZE )
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{
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/* Copy data to pbuf*/
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memcpy( (u8_t*)((u8_t*)q->payload + payloadoffset), (u8_t*)((u8_t*)buffer + bufferoffset), (ETH_RX_BUF_SIZE - bufferoffset));
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/* Point to next descriptor */
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DMARxDesc = (ETH_DMADESCTypeDef *)(DMARxDesc->Buffer2NextDescAddr);
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buffer = (unsigned char *)(DMARxDesc->Buffer1Addr);
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byteslefttocopy = byteslefttocopy - (ETH_RX_BUF_SIZE - bufferoffset);
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payloadoffset = payloadoffset + (ETH_RX_BUF_SIZE - bufferoffset);
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bufferoffset = 0;
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}
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/* Copy remaining data in pbuf */
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memcpy( (u8_t*)((u8_t*)q->payload + payloadoffset), (u8_t*)((u8_t*)buffer + bufferoffset), byteslefttocopy);
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bufferoffset = bufferoffset + byteslefttocopy;
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}
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}
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/* Release descriptors to DMA */
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DMARxDesc =frame.descriptor;
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/* Set Own bit in Rx descriptors: gives the buffers back to DMA */
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for (i=0; i<DMA_RX_FRAME_infos->Seg_Count; i++)
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{
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DMARxDesc->Status = ETH_DMARxDesc_OWN;
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DMARxDesc = (ETH_DMADESCTypeDef *)(DMARxDesc->Buffer2NextDescAddr);
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}
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/* Clear Segment_Count */
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DMA_RX_FRAME_infos->Seg_Count =0;
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/* When Rx Buffer unavailable flag is set: clear it and resume reception */
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if ((ETH->DMASR & ETH_DMASR_RBUS) != (u32)RESET)
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{
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/* Clear RBUS ETHERNET DMA flag */
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ETH->DMASR = ETH_DMASR_RBUS;
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/* Resume DMA reception */
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ETH->DMARPDR = 0;
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}
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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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{
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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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}
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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 = "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;
|
||
|
|
|
||
|
|
/* initialize the hardware */
|
||
|
|
low_level_init(netif);
|
||
|
|
|
||
|
|
return ERR_OK;
|
||
|
|
}
|