91x_enet.c

MCS-51的一个Free小型操作系统,在KeilC中下编译工作

{
int i;

	for( i = 0; i < ENET_NUM_RX_BUFFERS; i++ )
	{
		/* Assign temp Rx array to the ENET buffer */
		dmaRxDscrBase[ i ].dmaAddr = (u32)&(RxBuff[ i ][ 0 ]);

		/* Initialize RX ENET Status and control */
		dmaRxDscrBase[ i ].dmaStatCntl = 0x4000;

		/* Initialize the next descriptor- In our case its single descriptor */
		dmaRxDscrBase[ i ].dmaNext = (u32)&(dmaRxDscrBase[i+1]) | 0x01;

		/* Set the max packet size  */
		dmaRxDscrBase[ i ].dmaStatCntl = ENET_MAX_PACKET_SIZE | ENET_NEXT_ENABLE;

		/* Setting the VALID bit */
		dmaRxDscrBase[ i ].dmaPackStatus = DMA_DSCR_RX_STATUS_VALID_MSK;
	}

	dmaRxDscrBase[ ENET_NUM_RX_BUFFERS - 1 ].dmaNext = (u32)&(dmaRxDscrBase[ 0 ]);

	/* Setting the RX NEXT Descriptor Register inside the ENET */
	ENET_DMA->RXNDAR = (u32)&(dmaRxDscrBase) | 0x01;
}

/*******************************************************************************
* Function Name  : ENET_TxDscrInit
* Description    : Initializes the Tx ENET descriptor chain with single descriptor
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/

void ENET_TxDscrInit(void)
{

  /* ENET Start Address */
  dmaTxDscrBase.dmaAddr = (u32)TxBuff;

  /* Next Descriptor Address */
  dmaTxDscrBase.dmaNext = (u32)&(dmaTxDscrBase);

  /* Initialize ENET status and control */
  dmaTxDscrBase.dmaStatCntl = 0;

  /* Tx next set to Tx decriptor base */
  ENET_DMA->TXNDAR = (u32)&(dmaTxDscrBase);

  /* Enable next enable */
  ENET_DMA->TXNDAR |= DMA_DSCR_NXT_NPOL_EN;

}

/*******************************************************************************
* Function Name  : ENET_Init
* Description    : ENET MAC, PHY and DMA initializations
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void ENET_Init ()
{

  vu32 regValue;
  ENET_MACConfig *MAC_Config;
  ENET_MACConfig config;
  u32 macAddrLow, macAddrHigh;

  /* De-assert the SRESET bit of ENET + MAC devices */
  ENET_DMA->SCR &=~DMA_SCR_SRESET;
  MAC_Config =&config;
  /* Initialize MAC control register with common values */
  MAC_Config->ReceiveALL = DISABLE;
  if (SCU_GetHCLKFreqValue() > 50000)
  MAC_Config->MIIPrescaler = MIIPrescaler_2;
  MAC_Config->LoopbackMode = DISABLE;
  MAC_Config->AddressFilteringMode = MAC_Perfect_Multicast_Perfect;
  MAC_Config->PassWrongFrame = DISABLE;
  MAC_Config->LateCollision = DISABLE;
  MAC_Config->BroadcastFrameReception = ENABLE;
  MAC_Config->PacketRetry = ENABLE;
  MAC_Config->RxFrameFiltering = ENABLE;
  MAC_Config->AutomaticPadRemoval = ENABLE;
  MAC_Config->DeferralCheck = ENABLE;

    /* Configure MAC control register */
  ENET_MACControlConfig(MAC_Config);

  /* DMA initialization */
  /* Read the ENET DMA Status and Control Register */
  regValue = ENET_DMA->SCR;

  /* Setup Tx Max burst size */
  regValue &= ~(u32)DMA_SCR_TX_MAX_BURST_SZ;
  regValue |= (u32)DMA_SCR_TX_MAX_BURST_SZ_VAL;

  /* Setup Rx Max Burst size */
  regValue &= ~(u32)DMA_SCR_RX_MAX_BURST_SZ;
  regValue |= (u32)DMA_SCR_RX_MAX_BURST_SZ_VAL;

  /* Write Tx & Rx burst size to the ENET status and control register */
  ENET_DMA->SCR = regValue;

  /* Put the PHY in reset mode */
  ENET_MIIWriteReg(0x0,MAC_MII_REG_XCR, 0x8000);

  /* Delay to assure PHY reset */
  vTaskDelay( 3000 );

  /* initialize the opearting mode */
  while( ENET_SetOperatingMode() == pdFAIL )
  {
  	vTaskDelay( 3000 );
  }

  /*set MAC physical*/
  macAddrLow  = (MAC_ADDR3<<24) + (MAC_ADDR2<<16) + \
                (MAC_ADDR1<<8) + MAC_ADDR0;

  // Higher MAC address
  macAddrHigh = (MAC_ADDR5<<8) + MAC_ADDR4;

  /* Initialize Rx and Tx descriptors in memory */
  ENET_TxDscrInit();
  ENET_RxDscrInit();
}

/********************************************************************************
* Function Name  : ENET_HandleRxPkt
* Description    : receive a packet and copy it to memory pointed by ppkt.
* Input          : ppkt: pointer on application receive buffer.
* Output         : None
* Return         : ENET_NOK - If there is no packet
*                : ENET_OK  - If there is a packet
*******************************************************************************/
u32 ENET_HandleRxPkt ( void *ppkt)
{
ENET_DMADSCRBase *pDescr;
u16 size;
static int iNextRx = 0;

	if( dmaRxDscrBase[ iNextRx ].dmaPackStatus & DMA_DSCR_RX_STATUS_VALID_MSK )
	{
		return 0;
	}

	pDescr = &dmaRxDscrBase[ iNextRx ];

	/*Get the size of the packet*/
	size = ((pDescr->dmaPackStatus & 0x7ff) - 4);

	//MEMCOPY_L2S_BY4((u8*)ppkt, RxBuff, size); /*optimized memcopy function*/
	memcpy(ppkt, RxBuff[iNextRx], size);   //string.h library*/

	/* Give the buffer back to ENET */
	pDescr->dmaPackStatus = DMA_DSCR_RX_STATUS_VALID_MSK;

	iNextRx++;

	if( iNextRx >= ENET_NUM_RX_BUFFERS )
	{
		iNextRx = 0;
	}

	/* Return no error */
	return size;
}

/*******************************************************************************
* Function Name  : ENET_TxPkt
* Description    : Transmit a packet
* Input          : ppkt: pointer to application packet Buffer
*                : size: Tx Packet size
* Output         : None
* Return         : None
*******************************************************************************/

u8 *pcGetNextBuffer( void )
{
	if( dmaTxDscrBase.dmaPackStatus & DMA_DSCR_TX_STATUS_VALID_MSK )
	{
		return NULL;
	}
	else
	{
		return ( unsigned char * ) TxBuff;
	}
}

void ENET_TxPkt(void *ppkt, u16 size)
{
	/* Setting the Frame Length*/
	dmaTxDscrBase.dmaStatCntl = (size&0xFFF);

	/* Start the ENET by setting the VALID bit in dmaPackStatus of current descr*/
	dmaTxDscrBase.dmaPackStatus = DMA_DSCR_TX_STATUS_VALID_MSK;

	/* Start the transmit operation */
	ENET_DMA->TXSTR|= DMA_TX_START_FETCH;
}

/*******************************************************************************
* Function Name  : ENET_Start
* Description    : Enables ENET MAC reception / transmission & starts DMA fetch
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/

void  ENET_Start ( void)
{
  u32 value;

  /* Force a ENET abort by software for the receive block */
   ENET_DMA->RXSTR &=~ DMA_RX_START_DMA_EN;

  /* Force a ENET abort by software for the transmit block */
   ENET_DMA->TXSTR &=~DMA_TX_START_DMA_EN;

  /* Reset all interrupts */
  ENET_DMA->ISR = 0xFFFFFFFF;

  /* Setup Descriptor Fetch ENET_PhyDelay for Receive Block */
  value = ENET_DMA->RXSTR;
  value &= ~( DMA_RX_START_DFETCH_DLY );
  value |= DMA_RX_START_DFETCH_DEFAULT;
  ENET_DMA->RXSTR=  value;

  /* Setup Descriptor Fetch ENET_PhyDelay for Transmit Block */
  value = ENET_DMA->TXSTR;
  value &= ~( DMA_TX_START_DFETCH_DLY );
  value |= DMA_TX_START_DFETCH_DEFAULT;
  ENET_DMA->TXSTR= value;

  /* Set Tx underrun bit */
  value &= ~( DMA_TX_START_URUN );
  value |= DMA_TX_START_URUN;
  ENET_DMA->TXSTR = value;

  /* Clear the interrupts */
  ENET_DMA->IER = 0x0;

  /* MAC TX enable */
  ENET_MAC->MCR|= MAC_MCR_TE;

  /* MAC RX enable */
  ENET_MAC->MCR|= MAC_MCR_RE;

  /* Start the DMA Fetch */
  ENET_DMA->RXSTR|= DMA_RX_START_FETCH;
}


/*******************************************************************************
* Function Name  : ENET_InitClocksGPIO
* Description    : Reset, clocks & GPIO Ethernet Pin initializations
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void ENET_InitClocksGPIO(void)
{

  GPIO_InitTypeDef GPIO_Struct;

  SCU_AHBPeriphClockConfig(__ENET, ENABLE);
  SCU_AHBPeriphReset(__ENET,DISABLE);
  SCU_PHYCLKConfig(ENABLE);

  GPIO_DeInit(GPIO1);
  GPIO_Struct.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 |GPIO_Pin_3 |GPIO_Pin_4 |GPIO_Pin_7 ;
  GPIO_Struct.GPIO_Type = GPIO_Type_PushPull;
  GPIO_Struct.GPIO_Direction = GPIO_PinOutput;
  GPIO_Struct.GPIO_IPConnected = GPIO_IPConnected_Disable;
  GPIO_Struct.GPIO_Alternate=GPIO_OutputAlt2;
  GPIO_Init(GPIO1, &GPIO_Struct);


  GPIO_DeInit(GPIO5);
  GPIO_Struct.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_Struct.GPIO_Type = GPIO_Type_PushPull;
  GPIO_Struct.GPIO_Direction = GPIO_PinOutput;
  GPIO_Struct.GPIO_IPConnected = GPIO_IPConnected_Disable;
  GPIO_Struct.GPIO_Alternate=GPIO_OutputAlt2;
  GPIO_Init(GPIO5, &GPIO_Struct);

}

/******************** (C) COPYRIGHT 2006 STMicroelectronics *******************/