LPC Ethernet with DP83848 PHY

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LPC Ethernet with DP83848 PHY

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Contributor I

I'm new to LPC and I'm trying to get a DP83848 PHY working with ENET.  With some help, I've written a PHY layer to use with the LwIP example but I'm having some trouble reading the registers.  Any time I read any of the registers on the PHY it's returning 0xFFFF.  I think I've missed something in setting up the pins or perhaps the clocks.

Pictures of Pin's and Clocks attached. 


Any guidance is appreciated!

PHY code:

 


const phy_operations_t phyd8opts = {.phyInit = phyDpInit,
.phyWrite = phyDpWrite,
.phyRead = phyDpRead,
.getLinkStatus = phyDpGetLinkStatus,
.getLinkSpeedDuplex = phyDpGetLinkSpeedDuplex,
.enableLoopback = NULL};


#define PHY_WRITE(x,y)MDIO_Write(handle->mdioHandle, handle->phyAddr, x, y)
#define PHY_READ(x,y)MDIO_Read(handle->mdioHandle, handle->phyAddr, x, y)


void phyDelay(uint32_t mills)
{
int i = 0;
while(i++ < (mills * 128000))
__asm__("nop");
}


status_t phyDpInit(phy_handle_t *handle, const phy_config_t *config)
{
uint32_t read;
int i;
MDIO_Init(handle->mdioHandle);
handle->phyAddr = config->phyAddr;

// Reset the phy
if(PHY_WRITE(DP8_BMCR_REG,DP8_RESET) == kStatus_Fail)
return kStatus_Fail;

i = 500;
while(i--)
{
phyDelay(1);
if(PHY_READ(DP8_BMCR_REG, &read) == kStatus_Fail)
return kStatus_Fail;

if(!(read & (DP8_RESET | DP8_POWER_DOWN)))
break;
}

if( i == -1 )
return kStatus_Timeout;


// Set the configuration
if(PHY_WRITE(DP8_BMCR_REG, DP8_AUTONEG) == kStatus_Fail)
return kStatus_Fail;

do
{
phyDelay(1);
PHY_READ(DP8_BMSR_REG, &read);
} while(!(read & DP8_AUTONEG_COMP));


return kStatus_Success;
}

status_t phyDpWrite(phy_handle_t *handle, uint32_t phyReg, uint32_t data)
{
return MDIO_Write(handle->mdioHandle, handle->phyAddr, phyReg, data);
}

status_t phyDpRead(phy_handle_t *handle, uint32_t phyReg, uint32_t *dataPtr)
{
return MDIO_Read(handle->mdioHandle, handle->phyAddr, phyReg, dataPtr);
}

status_t phyDpGetLinkStatus(phy_handle_t *handle, bool *status)
{
uint32_t read;

if(PHY_READ(DP8_BMSR_REG, &read) == kStatus_Success)
{
*status = (read & DP8_LINK_STATUS);
return kStatus_Success;
}

return kStatus_Fail;
}


status_t phyDpGetLinkSpeedDuplex(phy_handle_t *handle, phy_speed_t *speed, phy_duplex_t *duplex)
{
uint32_t read;
status_t ret;


ret = kStatus_Fail;
if(PHY_READ(DP8_BMSR_REG, &read) == kStatus_Success)
{
ret = kStatus_Success;
if(read & DP8_100BASE_TX_FD)
{
*speed = kPHY_Speed100M;
*duplex = kPHY_FullDuplex;
}
else if(read & DP8_100BASE_TX_HD)
{
*speed = kPHY_Speed100M;
*duplex = kPHY_HalfDuplex;
}
else if(read & DP8_10BASE_T_FD)
{
*speed = kPHY_Speed10M;
*duplex = kPHY_FullDuplex;
}
else if(read & DP8_10BASE_T_HD)
{
*speed = kPHY_Speed10M;
*duplex = kPHY_FullDuplex;
}
else
{
ret = kStatus_Fail;
}
}

return ret;

}

 

 

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NXP TechSupport
NXP TechSupport

Hi,

Unfortunately, we do not have any implementation that you could use as reference for this PHY which is different from the one we use un our evaluation boards. I checked your pins and clocks and they seem correct.

I found this old thread from a customer that implemented drivers for this PHY and LPC1788 that you may find useful.

Change PHY to DP83848 in LWIP_lpc-v08.0 - NXP Community

Also, as far as I know the PHY you are using requires external reference clock so I don’t know if this could the because of the issue as well.

Best regards,

Felipe

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