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rt-thread-official/bsp/lpc408x/Libraries/Drivers/source/lpc_emac.c

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/**********************************************************************
* $Id$ lpc_emac.c 2011-06-02
*//**
* @file lpc_emac.c
* @brief Contains all functions support for Ethernet MAC firmware
* library on LPC
* @version 1.0
* @date 02. June. 2011
* @author NXP MCU SW Application Team
*
* Copyright(C) 2011, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors'
* relevant copyright in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers. This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
**********************************************************************/
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc_libcfg.h"
#else
#include "lpc_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */
#ifdef _EMAC
#include "lpc_emac.h"
#include "lpc_clkpwr.h"
#include "lpc_pinsel.h"
/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup EMAC
* @{
*/
/************************** PRIVATE VARIABLES *************************/
/* MII Mgmt Configuration register - Clock divider setting */
const uint8_t EMAC_clkdiv[] = { 4, 6, 8, 10, 14, 20, 28, 36, 40, 44, 48, 52, 56, 60, 64 };
/* EMAC Config data */
static EMAC_CFG_Type EMAC_Configs;
/* EMAC local DMA Descriptors */
#ifdef __IAR_SYSTEMS_ICC__
/* Global Tx Buffer data */
#pragma data_alignment=4
static uint16_t saFrameBuffers[EMAC_MAX_FRAME_NUM][EMAC_MAX_FRAME_SIZE];
#else
/* Global Rx Buffer data */
static uint16_t __attribute__ ((aligned (4))) saFrameBuffers[EMAC_MAX_FRAME_NUM][EMAC_MAX_FRAME_SIZE];
#endif
static uint32_t sulCurrFrameSz = 0;
static uint8_t sbCurrFrameID = 0;
/***************************** PRIVATE FUNCTION *****************************/
static void EMAC_UpdateRxConsumeIndex(void);
static void EMAC_UpdateTxProduceIndex(void);
static uint32_t EMAC_AllocTxBuff(uint16_t nFrameSize, uint8_t bLastFrame);
static uint32_t EMAC_GetRxFrameSize(void);
/*********************************************************************//**
* @brief
* @param[in]
* @return
**********************************************************************/
void rx_descr_init (void)
{
unsigned int i;
for (i = 0; i < EMAC_NUM_RX_FRAG; i++)
{
RX_DESC_PACKET(i) = RX_BUF(i);
RX_DESC_CTRL(i) = EMAC_RCTRL_INT | (EMAC_ETH_MAX_FLEN-1);
RX_STAT_INFO(i) = 0;
RX_STAT_HASHCRC(i) = 0;
}
/* Set EMAC Receive Descriptor Registers. */
LPC_EMAC->RxDescriptor = RX_DESC_BASE;
LPC_EMAC->RxStatus = RX_STAT_BASE;
LPC_EMAC->RxDescriptorNumber = EMAC_NUM_RX_FRAG-1;
/* Rx Descriptors Point to 0 */
LPC_EMAC->RxConsumeIndex = 0;
}
/*********************************************************************//**
* @brief
* @param[in]
* @return
**********************************************************************/
void tx_descr_init (void)
{
unsigned int i;
for (i = 0; i < EMAC_NUM_TX_FRAG; i++)
{
TX_DESC_PACKET(i) = TX_BUF(i);
TX_DESC_CTRL(i) = 0;
TX_STAT_INFO(i) = 0;
}
/* Set EMAC Transmit Descriptor Registers. */
LPC_EMAC->TxDescriptor = TX_DESC_BASE;
LPC_EMAC->TxStatus = TX_STAT_BASE;
LPC_EMAC->TxDescriptorNumber = EMAC_NUM_TX_FRAG-1;
/* Tx Descriptors Point to 0 */
LPC_EMAC->TxProduceIndex = 0;
}
/*********************************************************************//**
* @brief Set Station MAC address for EMAC module
* @param[in] abStationAddr Pointer to Station address that contains 6-bytes
* of MAC address.
* @return None
**********************************************************************/
void setEmacAddr(uint8_t abStationAddr[])
{
/* Set the Ethernet MAC Address registers */
LPC_EMAC->SA0 = ((uint32_t)abStationAddr[5] << 8) | (uint32_t)abStationAddr[4];
LPC_EMAC->SA1 = ((uint32_t)abStationAddr[3] << 8) | (uint32_t)abStationAddr[2];
LPC_EMAC->SA2 = ((uint32_t)abStationAddr[1] << 8) | (uint32_t)abStationAddr[0];
}
/************************** GLOBAL/PUBLIC FUNCTIONS *************************/
/** @defgroup EMAC_Public_Functions
* @{
*/
/*********************************************************************//**
* @brief Write data to PHY
* @param[in] PhyReg PHY register address
* @param[in] Value Register Value
* @return None
**********************************************************************/
void EMAC_Write_PHY (uint8_t PhyReg, uint16_t Value)
{
unsigned int tout;
LPC_EMAC->MADR = ((EMAC_Configs.bPhyAddr & 0x1F) << 8 )| (PhyReg & 0x1F);
LPC_EMAC->MWTD = Value;
/* Wait utill operation completed */
tout = 0;
for (tout = 0; tout < EMAC_MII_WR_TOUT; tout++)
{
if ((LPC_EMAC->MIND & EMAC_MIND_BUSY) == 0)
{
break;
}
}
}
/*********************************************************************//**
* @brief Read data from PHY register
* @param[in] PhyReg PHY register address
* @return Register value
**********************************************************************/
uint16_t EMAC_Read_PHY (uint8_t PhyReg)
{
unsigned int tout;
LPC_EMAC->MADR = ((EMAC_Configs.bPhyAddr & 0x1F) << 8 )| (PhyReg & 0x1F);
LPC_EMAC->MCMD = EMAC_MCMD_READ;
/* Wait until operation completed */
tout = 0;
for (tout = 0; tout < EMAC_MII_RD_TOUT; tout++)
{
if ((LPC_EMAC->MIND & EMAC_MIND_BUSY) == 0)
{
break;
}
}
LPC_EMAC->MCMD = 0;
return (LPC_EMAC->MRDD);
}
/*********************************************************************//**
* @brief Set Full/Half Duplex Mode
* @param[in] full_duplex 0: Half-duplex, 1: Full-duplex
* @return None
**********************************************************************/
void EMAC_SetFullDuplexMode(uint8_t full_duplex)
{
if(full_duplex)
{
LPC_EMAC->MAC2 |= EMAC_MAC2_FULL_DUP;
LPC_EMAC->Command |= EMAC_CR_FULL_DUP;
LPC_EMAC->IPGT = EMAC_IPGT_FULL_DUP;
}
else
{
LPC_EMAC->IPGT = EMAC_IPGT_HALF_DUP;
}
}
/*********************************************************************//**
* @brief Set PHY Speed
* @param[in] mode_100Mbps 0: 10Mbps, 1: 100Mbps
* @return None
**********************************************************************/
void EMAC_SetPHYSpeed(uint8_t mode_100Mbps)
{
if(mode_100Mbps)
{
LPC_EMAC->SUPP = EMAC_SUPP_SPEED;
}
else
{
LPC_EMAC->SUPP = 0;
}
}
/*********************************************************************//**
* @brief Initializes the EMAC peripheral according to the specified
* parameters in the EMAC_ConfigStruct.
* @param[in] EMAC_ConfigStruct Pointer to a EMAC_CFG_Type structure
* that contains the configuration information for the
* specified EMAC peripheral.
* @return None
*
* Note: This function will initialize EMAC module according to procedure below:
* - Remove the soft reset condition from the MAC
* - Configure the PHY via the MIIM interface of the MAC
* - Select RMII mode
* - Configure the transmit and receive DMA engines, including the descriptor arrays
* - Configure the host registers (MAC1,MAC2 etc.) in the MAC
* - Enable the receive and transmit data paths
* In default state after initializing, Rx Done and Tx Done interrupt are enabled,
* nad all interrupts are also enabled
* (Ref. from LPC17xx UM)
**********************************************************************/
int32_t EMAC_Init(EMAC_CFG_Type *EMAC_ConfigStruct)
{
/* Initialize the EMAC Ethernet controller. */
volatile int32_t tout, tmp;
EMAC_Configs = *EMAC_ConfigStruct;
/* Set up power for Ethernet module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCENET, ENABLE);
/* Enable P1 Ethernet Pins. */
/* Reset all EMAC internal modules */
LPC_EMAC->MAC1 = EMAC_MAC1_RES_TX | EMAC_MAC1_RES_MCS_TX | EMAC_MAC1_RES_RX |
EMAC_MAC1_RES_MCS_RX | EMAC_MAC1_SIM_RES | EMAC_MAC1_SOFT_RES;
LPC_EMAC->Command = EMAC_CR_REG_RES | EMAC_CR_TX_RES | EMAC_CR_RX_RES | EMAC_CR_PASS_RUNT_FRM;
/* A short delay after reset. */
for (tout = 100; tout; tout--);
/* Initialize MAC control registers. */
LPC_EMAC->MAC1 = EMAC_MAC1_PASS_ALL;
LPC_EMAC->MAC2 = EMAC_MAC2_CRC_EN | EMAC_MAC2_PAD_EN;
LPC_EMAC->MAXF = EMAC_ETH_MAX_FLEN;
/*
* Find the clock that close to desired target clock
*/
tmp = CLKPWR_GetCLK(CLKPWR_CLKTYPE_CPU)/ EMAC_MCFG_MII_MAXCLK;
for (tout = 0; tout < sizeof (EMAC_clkdiv); tout++)
{
if (EMAC_clkdiv[tout] >= tmp)
break;
}
if(tout >= sizeof (EMAC_clkdiv))
return ERROR;
tout++;
// Set Frame size
LPC_EMAC->MAXF = EMAC_ConfigStruct->nMaxFrameSize;
// Write to MAC configuration register and reset
LPC_EMAC->MCFG = EMAC_MCFG_CLK_SEL(tout) | EMAC_MCFG_RES_MII;
// release reset
LPC_EMAC->MCFG &= ~(EMAC_MCFG_RES_MII);
LPC_EMAC->CLRT = EMAC_CLRT_DEF;
LPC_EMAC->IPGR = EMAC_IPGR_P2_DEF;
/* Enable Reduced MII interface. */
LPC_EMAC->Command = EMAC_CR_RMII | EMAC_CR_PASS_RUNT_FRM;
// Initilialize PHY
if(EMAC_ConfigStruct->pfnPHYInit != NULL)
{
if(EMAC_ConfigStruct->pfnPHYInit(&EMAC_ConfigStruct->PhyCfg) != SUCCESS)
{
return ERROR;
}
}
// Set EMAC address
setEmacAddr(EMAC_ConfigStruct->pbEMAC_Addr);
/* Initialize Tx and Rx DMA Descriptors */
rx_descr_init ();
tx_descr_init ();
// Set Receive Filter register: enable broadcast and multicast
LPC_EMAC->RxFilterCtrl = EMAC_RFC_MCAST_EN | EMAC_RFC_BCAST_EN | EMAC_RFC_PERFECT_EN;
/* Enable Rx Done and Tx Done interrupt for EMAC */
EMAC_IntCmd((EMAC_INT_RX_OVERRUN | EMAC_INT_RX_ERR | EMAC_INT_RX_FIN \
| EMAC_INT_RX_DONE | EMAC_INT_TX_UNDERRUN | EMAC_INT_TX_ERR \
| EMAC_INT_TX_FIN | EMAC_INT_TX_DONE), ENABLE);
/* Reset all interrupts */
LPC_EMAC->IntClear = 0xFFFF;
/* Enable receive and transmit mode of MAC Ethernet core */
EMAC_TxEnable();
EMAC_RxEnable();
NVIC_EnableIRQ(ENET_IRQn);
return SUCCESS;
}
/*********************************************************************//**
* @brief De-initializes the EMAC peripheral registers to their
* default reset values.
* @param[in] None
* @return None
**********************************************************************/
void EMAC_DeInit(void)
{
// Disable all interrupt
LPC_EMAC->IntEnable = 0x00;
// Clear all pending interrupt
LPC_EMAC->IntClear = (0xFF) | (EMAC_INT_SOFT_INT | EMAC_INT_WAKEUP);
LPC_EMAC->Command = 0;
/* TurnOff power for Ethernet module */
CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCENET, DISABLE);
}
/*********************************************************************//**
* @brief EMAC TX API modules
* @param[in] None
* @return None
**********************************************************************/
void EMAC_TxEnable( void )
{
LPC_EMAC->Command |= EMAC_CR_TX_EN;
return;
}
/*********************************************************************//**
* @brief EMAC RX API modules
* @param[in] None
* @return None
**********************************************************************/
void EMAC_TxDisable( void )
{
LPC_EMAC->Command &= ~EMAC_CR_TX_EN;
return;
}
/*********************************************************************//**
* @brief EMAC RX API modules
* @param[in] None
* @return None
**********************************************************************/
void EMAC_RxEnable( void )
{
LPC_EMAC->Command |= EMAC_CR_RX_EN;
LPC_EMAC->MAC1 |= EMAC_MAC1_REC_EN;
return;
}
/*********************************************************************//**
* @brief EMAC RX API modules
* @param[in] None
* @return None
**********************************************************************/
void EMAC_RxDisable( void )
{
LPC_EMAC->Command &= ~EMAC_CR_RX_EN;
LPC_EMAC->MAC1 &= ~EMAC_MAC1_REC_EN;
return;
}
/*********************************************************************//**
* @brief Get the status of given buffer.
* @param[in] idx Buffer index
* @return EMAC_BUFF_AVAILABLE/EMAC_BUFF_FULL/EMAC_BUFF_PARTIAL_FULL
*
**********************************************************************/
EMAC_BUFF_STATUS EMAC_GetBufferSts(EMAC_BUFF_IDX idx)
{
uint32_t consume_idx, produce_idx;
uint32_t max_frag_num;
// Get the consume index, produce index and the buffer size
if(idx == EMAC_TX_BUFF)
{
consume_idx = LPC_EMAC->TxConsumeIndex;
produce_idx = LPC_EMAC->TxProduceIndex;
max_frag_num = LPC_EMAC->TxDescriptorNumber + 1;
}
else
{
consume_idx = LPC_EMAC->RxConsumeIndex;
produce_idx = LPC_EMAC->RxProduceIndex;
max_frag_num = LPC_EMAC->RxDescriptorNumber + 1;
}
// empty
if(consume_idx == produce_idx)
return EMAC_BUFF_EMPTY;
// Full
if(consume_idx == 0 &&
produce_idx == max_frag_num - 1)
return EMAC_BUFF_FULL;
// Wrap-around
if(consume_idx == produce_idx + 1)
return EMAC_BUFF_FULL;
return EMAC_BUFF_PARTIAL_FULL;
}
/*********************************************************************//**
* @brief Allocate a descriptor for sending frame and get the coressponding buffer address
* @param[in] FrameSize The size of frame you want to send
* @return Address of the TX_DESC_PACKET buffer
**********************************************************************/
uint32_t EMAC_AllocTxBuff(uint16_t nFrameSize, uint8_t bLastFrame)
{
uint32_t idx;
uint32_t dp;
volatile uint32_t i;
idx = LPC_EMAC->TxProduceIndex;
while(EMAC_GetBufferSts(EMAC_TX_BUFF) == EMAC_BUFF_FULL)
{
for(i = 0; i < 1000000; i++) ;
}
dp = TX_DESC_PACKET(idx);
if(bLastFrame)
TX_DESC_CTRL(idx) = ((nFrameSize-1) & EMAC_TCTRL_SIZE) | (EMAC_TCTRL_INT | EMAC_TCTRL_LAST);
else
TX_DESC_CTRL(idx) = ((nFrameSize-1) & EMAC_TCTRL_SIZE) | (EMAC_TCTRL_INT);
return dp;
}
/*********************************************************************//**
* @brief Increase the TxProduceIndex (after writting to the Transmit buffer
* to enable the Transmit buffer) and wrap-around the index if
* it reaches the maximum Transmit Number
* @param[in] None
* @return None
**********************************************************************/
void EMAC_UpdateTxProduceIndex(void)
{
// Get current Tx produce index
uint32_t idx = LPC_EMAC->TxProduceIndex;
/* Start frame transmission */
if (++idx == LPC_EMAC->TxDescriptorNumber + 1) idx = 0;
LPC_EMAC->TxProduceIndex = idx;
}
/*********************************************************************//**
* @brief Get current status value of receive data (due to TxProduceIndex)
* @param[in] None
* @return Current value of receive data (due to TxProduceIndex)
**********************************************************************/
uint32_t EMAC_GetTxFrameStatus(void)
{
uint32_t idx;
idx = LPC_EMAC->TxProduceIndex;
return (TX_STAT_INFO(idx));
}
/*********************************************************************//**
* @brief Write data to Tx packet data buffer at current index due to
* TxProduceIndex
* @param[in] pDataStruct store the address and the size of buffer that saves data.
* @return None
**********************************************************************/
void EMAC_WritePacketBuffer(EMAC_PACKETBUF_Type *pDataStruct)
{
uint16_t* pDest;
uint16_t* pSource = (uint16_t*)pDataStruct->pbDataBuf;
uint32_t size = pDataStruct->ulDataLen;
int32_t frame_num;
uint32_t tmp;
uint32_t max_frame_size = LPC_EMAC->MAXF;
size = (size + 1) & 0xFFFE; // round Size up to next even number
frame_num = size/max_frame_size;
if(size == 0)
return;
while(frame_num >= 0)
{
tmp = (frame_num > 0)? max_frame_size:size;
if(tmp == 0)
break;
// Setup descriptors and data
if(frame_num == 0)
pDest = (uint16_t*)EMAC_AllocTxBuff(tmp, 1); // last frame
else
pDest = (uint16_t*)EMAC_AllocTxBuff(tmp, 0);
// Copy data
while (tmp > 0)
{
*pDest++ = *pSource++;
tmp -= 2;
}
frame_num--;
size -= tmp;
// Update produce index
EMAC_UpdateTxProduceIndex();
}
}
/*********************************************************************//**
* @brief Get current status value of receive data (due to RxConsumeIndex)
* @param[in] None
* @return Current value of receive data (due to RxConsumeIndex)
**********************************************************************/
uint32_t EMAC_GetRxFrameStatus(void)
{
uint32_t idx;
idx = LPC_EMAC->RxConsumeIndex;
return (RX_STAT_INFO(idx));
}
/*********************************************************************//**
* @brief Get size of current Received data in received buffer (due to
* RxConsumeIndex)
* @param[in] None
* @return Size of received data
**********************************************************************/
uint32_t EMAC_GetRxFrameSize(void)
{
uint32_t idx;
idx = LPC_EMAC->RxConsumeIndex;
return (((RX_STAT_INFO(idx)) & EMAC_RINFO_SIZE)+1);
}
/*********************************************************************//**
* @brief Get the address of TX_DESC_PACKET buffer so that user can access from application
* @param[in] None
* @return Address of the TX_DESC_PACKET buffer
**********************************************************************/
uint32_t EMAC_GetRxBuffer(void)
{
uint32_t idx;
idx = LPC_EMAC->RxConsumeIndex;
return RX_DESC_PACKET(idx);
}
/*********************************************************************//**
* @brief Increase the RxConsumeIndex (after reading the Receive buffer
* to release the Receive buffer) and wrap-around the index if
* it reaches the maximum Receive Number
* @param[in] None
* @return None
**********************************************************************/
void EMAC_UpdateRxConsumeIndex(void)
{
// Get current Rx consume index
uint32_t idx = LPC_EMAC->RxConsumeIndex;
/* Release frame from EMAC buffer */
if (++idx == EMAC_NUM_RX_FRAG) idx = 0;
LPC_EMAC->RxConsumeIndex = idx;
}
/*********************************************************************//**
* @brief Standard EMAC IRQ Handler. This sub-routine will check
* these following interrupt and call the call-back function
* if they're already installed:
* - Overrun Error interrupt in RX Queue
* - Receive Error interrupt: AlignmentError, RangeError,
* LengthError, SymbolError, CRCError or NoDescriptor or Overrun
* - RX Finished Process Descriptors interrupt (ProduceIndex == ConsumeIndex)
* - Receive Done interrupt: Read received frame to the internal buffer
* - Transmit Under-run interrupt
* - Transmit errors interrupt : LateCollision, ExcessiveCollision
* and ExcessiveDefer, NoDescriptor or Under-run
* - TX Finished Process Descriptors interrupt (ProduceIndex == ConsumeIndex)
* - Transmit Done interrupt
* - Interrupt triggered by software
* - Interrupt triggered by a Wakeup event detected by the receive filter
* @param[in] None
* @return None
**********************************************************************/
void ENET_IRQHandler(void)
{
/* EMAC Ethernet Controller Interrupt function. */
uint32_t int_stat;
int32_t RxLen;
// Get EMAC interrupt status
while ((int_stat = (LPC_EMAC->IntStatus & LPC_EMAC->IntEnable)) != 0)
{
// Clear interrupt status
LPC_EMAC->IntClear = int_stat;
if(int_stat & (EMAC_INT_RX_OVERRUN |EMAC_INT_RX_ERR ))
{
uint32_t ulFrameSts = EMAC_GetRxFrameStatus();
uint32_t ulErrCode = 0;
ulErrCode |= (ulFrameSts & EMAC_RINFO_CRC_ERR) ? EMAC_CRC_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_RINFO_SYM_ERR) ? EMAC_SYMBOL_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_RINFO_LEN_ERR) ? EMAC_LENGTH_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_RINFO_ALIGN_ERR) ? EMAC_ALIGN_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_RINFO_OVERRUN) ? EMAC_OVERRUN_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_RINFO_NO_DESCR) ? EMAC_RX_NO_DESC_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_RINFO_FAIL_FILT) ? EMAC_FILTER_FAILED_ERR:0;
if(ulErrCode == 0)
{
/* Note:
* The EMAC doesn't distinguish the frame type and frame length,
* so, e.g. when the IP(0x8000) or ARP(0x0806) packets are received,
* it compares the frame type with the max length and gives the
* "Range" error. In fact, this bit is not an error indication,
* but simply a statement by the chip regarding the status of
* the received frame
*/
int_stat &= ~EMAC_INT_RX_ERR;
}
else
{
if(EMAC_Configs.pfnErrorReceive != NULL)
EMAC_Configs.pfnErrorReceive(ulErrCode);
}
}
if(int_stat & (EMAC_INT_TX_UNDERRUN|EMAC_INT_TX_ERR ))
{
uint32_t ulFrameSts = EMAC_GetTxFrameStatus();
uint32_t ulErrCode = 0;
ulErrCode |= (ulFrameSts & EMAC_TINFO_EXCESS_DEF) ? EMAC_EXCESSIVE_DEFER_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_TINFO_EXCESS_COL) ? EMAC_EXCESSIVE_COLLISION_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_TINFO_LATE_COL) ? EMAC_LATE_COLLISION_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_TINFO_UNDERRUN) ? EMAC_UNDERRUN_ERR:0;
ulErrCode |= (ulFrameSts & EMAC_TINFO_NO_DESCR) ? EMAC_TX_NO_DESC_ERR:0;
if(EMAC_Configs.pfnErrorReceive != NULL)
EMAC_Configs.pfnErrorReceive(ulErrCode);
}
if(int_stat & EMAC_INT_RX_DONE)
{
/* Packet received. */
if(EMAC_GetBufferSts(EMAC_RX_BUFF) != EMAC_BUFF_EMPTY)
{
// Get data size
RxLen = EMAC_GetRxFrameSize();
if(RxLen > 0)
{
// trip out 4-bytes CRC field, note that length in (-1) style format
RxLen -= 3;
if((EMAC_GetRxFrameStatus() & EMAC_RINFO_ERR_MASK )== 0)
{
uint16_t *pDest = (uint16_t*) &saFrameBuffers[sbCurrFrameID][sulCurrFrameSz];
uint16_t *pSource = (uint16_t*)EMAC_GetRxBuffer();
sulCurrFrameSz += RxLen;
if(sulCurrFrameSz >= EMAC_MAX_FRAME_SIZE)
{
sulCurrFrameSz = 0;
if(EMAC_Configs.pfnErrorReceive != NULL)
EMAC_Configs.pfnErrorReceive(EMAC_LENGTH_ERR);
}
else
{
// Copy data
while (RxLen > 0)
{
*pDest++ = *pSource++;
RxLen -= 2;
}
if(EMAC_GetRxFrameStatus() & EMAC_RINFO_LAST_FLAG)
{
if(EMAC_Configs.pfnFrameReceive != NULL)
{
EMAC_Configs.pfnFrameReceive((uint16_t*)saFrameBuffers[sbCurrFrameID], sulCurrFrameSz);
}
sulCurrFrameSz = 0;
sbCurrFrameID ++;
if(sbCurrFrameID >= EMAC_MAX_FRAME_NUM)
sbCurrFrameID = 0;
}
/* Release frame from EMAC buffer */
EMAC_UpdateRxConsumeIndex();
}
}
}
}
}
if(int_stat & EMAC_INT_TX_FIN && (EMAC_Configs.pfnTransmitFinish != NULL))
{
EMAC_Configs.pfnTransmitFinish();
}
if(int_stat & EMAC_INT_SOFT_INT && (EMAC_Configs.pfnSoftInt!= NULL))
{
EMAC_Configs.pfnSoftInt();
}
if(int_stat & EMAC_INT_WAKEUP && (EMAC_Configs.pfnWakeup!= NULL))
{
EMAC_Configs.pfnWakeup();
}
}
}
/*********************************************************************//**
* @brief Enable/Disable hash filter functionality for specified destination
* MAC address in EMAC module
* @param[in] dstMAC_addr Pointer to the first MAC destination address, should
* be 6-bytes length, in order LSB to the MSB
* @param[in] NewState New State of this command, should be:
* - ENABLE.
* - DISABLE.
* @return None
*
* Note:
* The standard Ethernet cyclic redundancy check (CRC) function is calculated from
* the 6 byte destination address in the Ethernet frame (this CRC is calculated
* anyway as part of calculating the CRC of the whole frame), then bits [28:23] out of
* the 32 bits CRC result are taken to form the hash. The 6 bit hash is used to access
* the hash table: it is used as an index in the 64 bit HashFilter register that has been
* programmed with accept values. If the selected accept value is 1, the frame is
* accepted.
**********************************************************************/
void EMAC_SetHashFilter(uint8_t dstMAC_addr[], FunctionalState NewState)
{
uint32_t *pReg;
uint32_t tmp;
int32_t crc;
// Calculate the CRC from the destination MAC address
crc = EMAC_CRCCalc(dstMAC_addr, 6);
// Extract the value from CRC to get index value for hash filter table
crc = (crc >> 23) & 0x3F;
pReg = (crc > 31) ? ((uint32_t *)&LPC_EMAC->HashFilterH) \
: ((uint32_t *)&LPC_EMAC->HashFilterL);
tmp = (crc > 31) ? (crc - 32) : crc;
if (NewState == ENABLE)
{
(*pReg) |= (1UL << tmp);
}
else
{
(*pReg) &= ~(1UL << tmp);
}
}
/*********************************************************************//**
* @brief Calculates CRC code for number of bytes in the frame
* @param[in] frame_no_fcs Pointer to the first byte of the frame
* @param[in] frame_len length of the frame without the FCS
* @return the CRC as a 32 bit integer
**********************************************************************/
int32_t EMAC_CRCCalc(uint8_t frame_no_fcs[], int32_t frame_len)
{
int i; // iterator
int j; // another iterator
char byte; // current byte
int crc; // CRC result
int q0, q1, q2, q3; // temporary variables
crc = 0xFFFFFFFF;
for (i = 0; i < frame_len; i++)
{
byte = *frame_no_fcs++;
for (j = 0; j < 2; j++)
{
if (((crc >> 28) ^ (byte >> 3)) & 0x00000001)
{
q3 = 0x04C11DB7;
}
else
{
q3 = 0x00000000;
}
if (((crc >> 29) ^ (byte >> 2)) & 0x00000001)
{
q2 = 0x09823B6E;
}
else
{
q2 = 0x00000000;
}
if (((crc >> 30) ^ (byte >> 1)) & 0x00000001)
{
q1 = 0x130476DC;
}
else
{
q1 = 0x00000000;
}
if (((crc >> 31) ^ (byte >> 0)) & 0x00000001)
{
q0 = 0x2608EDB8;
}
else
{
q0 = 0x00000000;
}
crc = (crc << 4) ^ q3 ^ q2 ^ q1 ^ q0;
byte >>= 4;
}
}
return crc;
}
/*********************************************************************//**
* @brief Enable/Disable Filter mode for each specified type EMAC peripheral
* @param[in] ulFilterMode Filter mode, should be:
* - EMAC_RFC_UCAST_EN: all frames of unicast types
* will be accepted
* - EMAC_RFC_BCAST_EN: broadcast frame will be
* accepted
* - EMAC_RFC_MCAST_EN: all frames of multicast
* types will be accepted
* - EMAC_RFC_UCAST_HASH_EN: The imperfect hash
* filter will be applied to unicast addresses
* - EMAC_RFC_MCAST_HASH_EN: The imperfect hash
* filter will be applied to multicast addresses
* - EMAC_RFC_PERFECT_EN: the destination address
* will be compared with the 6 byte station address
* programmed in the station address by the filter
* - EMAC_RFC_MAGP_WOL_EN: the result of the magic
* packet filter will generate a WoL interrupt when
* there is a match
* - EMAC_RFC_PFILT_WOL_EN: the result of the perfect address
* matching filter and the imperfect hash filter will
* generate a WoL interrupt when there is a match
* @param[in] NewState New State of this command, should be:
* - ENABLE
* - DISABLE
* @return None
**********************************************************************/
void EMAC_SetFilterMode(uint32_t ulFilterMode, FunctionalState NewState)
{
if (NewState == ENABLE)
{
LPC_EMAC->RxFilterCtrl |= ulFilterMode;
if((ulFilterMode & EMAC_RFC_MCAST_HASH_EN) &&
((ulFilterMode & EMAC_RFC_MCAST_EN) == 0))
{
LPC_EMAC->RxFilterCtrl &= ~EMAC_RFC_MCAST_EN;
}
if((ulFilterMode & EMAC_RFC_UCAST_HASH_EN) &&
((ulFilterMode & EMAC_RFC_UCAST_EN) == 0))
{
LPC_EMAC->RxFilterCtrl &= ~EMAC_RFC_UCAST_EN;
}
}
else
{
LPC_EMAC->RxFilterCtrl &= ~ulFilterMode;
}
}
/*********************************************************************//**
* @brief Get status of Wake On LAN Filter for each specified
* type in EMAC peripheral, clear this status if it is set
* @param[in] ulFilterMode WoL Filter mode, should be:
* - EMAC_WOL_UCAST: unicast frames caused WoL
* - EMAC_WOL_UCAST: broadcast frame caused WoL
* - EMAC_WOL_MCAST: multicast frame caused WoL
* - EMAC_WOL_UCAST_HASH: unicast frame that passes the
* imperfect hash filter caused WoL
* - EMAC_WOL_MCAST_HASH: multicast frame that passes the
* imperfect hash filter caused WoL
* - EMAC_WOL_PERFECT:perfect address matching filter
* caused WoL
* - EMAC_WOL_RX_FILTER: the receive filter caused WoL
* - EMAC_WOL_MAG_PACKET: the magic packet filter caused WoL
* @return SET/RESET
**********************************************************************/
FlagStatus EMAC_GetWoLStatus(uint32_t ulWoLMode)
{
if (LPC_EMAC->RxFilterWoLStatus & ulWoLMode)
{
LPC_EMAC->RxFilterWoLClear = ulWoLMode;
return SET;
}
else
{
return RESET;
}
}
/*********************************************************************//**
* @brief Enable/Disable interrupt for each type in EMAC
* @param[in] ulIntType Interrupt Type, should be:
* - EMAC_INT_RX_OVERRUN: Receive Overrun
* - EMAC_INT_RX_ERR: Receive Error
* - EMAC_INT_RX_FIN: Receive Descriptor Finish
* - EMAC_INT_RX_DONE: Receive Done
* - EMAC_INT_TX_UNDERRUN: Transmit Under-run
* - EMAC_INT_TX_ERR: Transmit Error
* - EMAC_INT_TX_FIN: Transmit descriptor finish
* - EMAC_INT_TX_DONE: Transmit Done
* - EMAC_INT_SOFT_INT: Software interrupt
* - EMAC_INT_WAKEUP: Wakeup interrupt
* @param[in] NewState New State of this function, should be:
* - ENABLE.
* - DISABLE.
* @return None
**********************************************************************/
void EMAC_IntCmd(uint32_t ulIntType, FunctionalState NewState)
{
if (NewState == ENABLE)
{
LPC_EMAC->IntEnable |= ulIntType;
}
else
{
LPC_EMAC->IntEnable &= ~(ulIntType);
}
}
/*********************************************************************//**
* @brief Check whether if specified interrupt flag is set or not
* for each interrupt type in EMAC and clear interrupt pending
* if it is set.
* @param[in] ulIntType Interrupt Type, should be:
* - EMAC_INT_RX_OVERRUN: Receive Overrun
* - EMAC_INT_RX_ERR: Receive Error
* - EMAC_INT_RX_FIN: Receive Descriptor Finish
* - EMAC_INT_RX_DONE: Receive Done
* - EMAC_INT_TX_UNDERRUN: Transmit Under-run
* - EMAC_INT_TX_ERR: Transmit Error
* - EMAC_INT_TX_FIN: Transmit descriptor finish
* - EMAC_INT_TX_DONE: Transmit Done
* - EMAC_INT_SOFT_INT: Software interrupt
* - EMAC_INT_WAKEUP: Wakeup interrupt
* @return New state of specified interrupt (SET or RESET)
**********************************************************************/
IntStatus EMAC_IntGetStatus(uint32_t ulIntType)
{
if (LPC_EMAC->IntStatus & ulIntType)
{
LPC_EMAC->IntClear = ulIntType;
return SET;
}
else
{
return RESET;
}
}
/**
* @}
*/
/**
* @}
*/
#endif /*_EMAC*/
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