void MACPut(int8 val)
{
NICPut(RBCR0, 1);
NICPut(RBCR1, 0);
NICPut(CMDR, 0x12);
NICPut(NIC_DATAPORT, val);
}
int8 MACGet(void)
{
NICPut(RBCR0, 1);
NICPut(RBCR1, 0);
NICPut(CMDR, 0x0a);
return NICGet(NIC_DATAPORT);
}
void NICSetAddr(int16 addr)
{
WORD_VAL t;
t.Val = addr;
NICPut(ISR, 0x40);
NICPut(RSAR0, t.v[0]);
NICPut(RSAR1, t.v[1]);
}
void MACDiscardRx(void)
{
int8 newBoundary;
newBoundary = NICReadPtr - 1;
if ( newBoundary < RXSTART )
newBoundary = RXSTOP - 1;
NICPut(CMDR, 0x20); // Select PAGE 0
NICPut(BNRY, newBoundary);
}
void NICSetAddr(WORD addr)
{
WORD_VAL t;
//The DMAAddr variable keeps track of the Remote DMA current address. Reads or writes to the
//Remote DMA will access this address, and increment it when done.
DMAAddr.Val = addr;
//Set the RSAR (Remote start address) registers to point to given address. This is the address
//of the RAM that will be accessed with subsequent read/write operations.
t.Val = addr;
//NICPut(ISR, 0x40); //ISR bit 6 is set when Remote DMA has completed - why is it set here???
NICPut(RSAR0, t.v[0]);
NICPut(RSAR1, t.v[1]);
}
int1 MACIsLinked(void)
{
int8 temp;
// Select Page 3
NICPut(CMDR, 0xe0);
// Read CONFIG0.
temp = NICGet(0x03);
// Reset to page 0.
NICPut(CMDR, 0x20);
// Bit 2 "BNC" will be '0' if LINK is established.
return (!bit_test(temp,2));
}
/**
* Check if the MAC is linked
*
* @return TRUE if linked, else FALSE
*/
BOOL MACIsLinked(void)
{
BYTE_VAL temp;
// Select Page 3
NICPut(CMDR, 0xe0);
// Read CONFIG0.
temp.Val = NICGet(0x03);
// Reset to page 0.
NICPut(CMDR, 0x20);
// Bit 2 "BNC" will be '0' if LINK is established.
return (temp.bits.b2 == 0);
}
/**
* This function writes the MAC header (Ethernet header) part of a packet that
* has to be transmitted to the current TX buffer (page in NIC RAM).
* After this function, the data must still be written to the TX buffer.
* After both header and data has been written, bits are set to instruct
* NIC to transmit transmit buffer. This function does the following: <ul>
* <li> Reset the NIC Remote DMA write pointer to the first byte of the current TX Buffer </li>
* <li> Write the given header to the current TX Buffer </li>
* <li> Set the NIC Remote DMA byte count to the given len. This configures the
* Remote DMA to receive the given number of bytes. </li></ul>
*
* @param[out] remote Pointer to a MAC_ADDR structure. This function will write the MAC address of the
* node who sent this packet to this structure
* @param type Type of header. Can be ETHER_IP, ETHER_ARP or MAC_UNKNOWN
* @param dataLen Size of the Data of this Ethernet packet. A Ethernet packet consists of: <br>
* - 6 Bytes = Desitination MAC address <br>
* - 6 Bytes = Source MAC address <br>
* - 2 Bytes = Type field, currently only IP or ARP <br>
* - n Bytes = Data. Minimum length of 46 bytes <br><br>
* The data will be written to the TX buffer following this command.
*
* @return True if header was read, False if not
*/
void MACPutHeader(MAC_ADDR *remote,
BYTE type,
WORD dataLen)
{
WORD_VAL mytemp;
BYTE etherType;
NICPut(ISR, 0x0a);
//Set the address of the current Remote DMA. This is the address that all future MACPut()
//functions will write data to in the current TX Buffer. This address is set to the start
//address of the current MAC TX Buffer. The current TX Buffer will thus point to the first
//byte in the packet that will be transmitted = first byte of Ethernet header
mytemp.v[1] = TxBuffers[MACCurrTxbuf].Index;
mytemp.v[0] = 0;
NICSetAddr(mytemp.Val);
/////////////////////////////////////////////////
//Write Ethernet header part (MAC header) = Dest MAC Adrr, Source MAC Adr, Type
MACPutArray((BYTE*)remote, sizeof(*remote));
MACPut(MY_MAC_BYTE1);
MACPut(MY_MAC_BYTE2);
MACPut(MY_MAC_BYTE3);
MACPut(MY_MAC_BYTE4);
MACPut(MY_MAC_BYTE5);
MACPut(MY_MAC_BYTE6);
if ( type == MAC_IP )
etherType = ETHER_IP;
else
etherType = ETHER_ARP;
MACPut(0x08);
MACPut(etherType);
dataLen += (WORD)sizeof(ETHER_HEADER);
//If datalength smaller than minimum Ethernet packet (not including CRC), pad till minimum size
if ( dataLen < MINFRAME )
dataLen = MINFRAME;
mytemp.Val = dataLen;
NICPut(TBCR0, mytemp.v[0]);
NICPut(TBCR1, mytemp.v[1]);
}
void MACPutHeader(MAC_ADDR *remote,
int8 type,
int16 dataLen)
{
WORD_VAL mytemp;
int8 etherType;
NICPut(ISR, 0x0a);
mytemp.v[1] = TxBuffers[NICCurrentTxBuffer].Index;
mytemp.v[0] = 0;
NICSetAddr(mytemp.Val);
// MACPutArray((int8*)remote, sizeof(*remote));
MACPutArray(remote, sizeof(MAC_ADDR));
debug(debug_putc,"\r\n\r\nMACPUTHEADER: DA:%X.%X.%X.%X.%X.%X T=%X L=%LX",
remote->v[0],remote->v[1],remote->v[2],remote->v[3],remote->v[4],remote->v[5],type,datalen);
MACPut(MY_MAC_BYTE1);
MACPut(MY_MAC_BYTE2);
MACPut(MY_MAC_BYTE3);
MACPut(MY_MAC_BYTE4);
MACPut(MY_MAC_BYTE5);
MACPut(MY_MAC_BYTE6);
if ( type == MAC_IP )
etherType = ETHER_IP;
else
etherType = ETHER_ARP;
MACPut(0x08);
MACPut(etherType);
dataLen += (int16)sizeof(ETHER_HEADER);
if ( dataLen < MINFRAME ) // 64 ) // NKR 4/23/02
dataLen = 64; // MINFRAME;
mytemp.Val = dataLen;
NICPut(TBCR0, mytemp.v[0]);
NICPut(TBCR1, mytemp.v[1]);
}
void MACFlush(void)
{
int8 i;
NICPut(TPSR, TxBuffers[NICCurrentTxBuffer].Index);
NICPut(CMDR, 0x24);
// After every transmission, adjust transmit pointer to
// next free transmit buffer.
for ( i = 0; i < MAX_DATA_BUFFERS; i++ )
{
if ( TxBuffers[i].bFree )
{
NICCurrentTxBuffer = i;
return;
}
}
}
int16 MACGetFreeRxSize(void)
{
int8 NICWritePtr;
int8 temp;
WORD_VAL tempVal;
NICPut(CMDR, 0x60);
NICWritePtr = NICGet(CURRP);
NICPut(CMDR, 0x20);
if ( NICWritePtr < NICCurrentRdPtr )
temp = (RXSTOP - NICCurrentRdPtr) + NICWritePtr;
else
temp = NICWritePtr - NICCurrentRdPtr;
temp = RXPAGES - temp;
tempVal.v[1] = temp;
tempVal.v[0] = 0;
return tempVal.Val;
}
/**
* Initializes registers that should have been initialized with the contents
* of the EEPROM
*
* @preCondition Must be called after chip is initialized
*
*/
void MACInitEepromRegs(void) {
// Select Page 3
NICPut(CMDR, 0xe0);
//Because the EEPROM read pin is floating on some boards, the registers initialized by the
//EEPROM will all contain non defined values. Write them with correct values
NICPut(RTL9346CR, 0xc0); //Config register write enable
NICPut(RTLCONF1, 0x00); //Interrupt disable
NICPut(RTL9346CR, 0xc0); //Config register write enable
NICPut(RTLCONF2, 0x00); //TP/CX link test enabled (10BaseT link test is enabled)
NICPut(RTL9346CR, 0xc0); //Config register write enable
NICPut(RTLCONF3, 0x00); //Not sleep mode, Not powerdown mode
NICPut(RTL9346CR, 0x00); //Normal operating mode
//Reset to default = Page 0
NICPut(CMDR, 0x20);
}
int16 MACGetArray(int8 *val, int16 len)
{
WORD_VAL t;
t.Val = len;
NICPut(ISR, 0x40);
NICPut(RBCR0, t.v[0]);
NICPut(RBCR1, t.v[1]);
NICPut(CMDR, 0x0a);
debug("\r\nMACGETARRAY: ");
while( len-- > 0 )
{
*val++ = NICGet(NIC_DATAPORT);
debug("%X ",*(val-1));
}
return t.Val;
}
/**
* This function returns total receive buffer size available for future data packets.
*/
WORD MACGetFreeRxSize(void)
{
BYTE NICWritePtr; //CURR register - RX buffer's PUT pointer
BYTE temp;
WORD_VAL tempVal;
//Read current page pointer - Curr is the RX Buffer's PUT pointer
NICPut(CMDR, 0x60); //Set page 1
NICWritePtr = NICGet(CURRP); //Curr is the RX Buffer's PUT pointer
NICPut(CMDR, 0x20); //Reset to page 0
if ( NICWritePtr < MACCurrRxbuf )
temp = (RXSTOP - MACCurrRxbuf) + NICWritePtr;
else
temp = NICWritePtr - MACCurrRxbuf;
temp = RXPAGES - temp;
tempVal.v[1] = temp;
tempVal.v[0] = 0;
return tempVal.Val;
}
void MACPutArray(int8 *val, int16 len)
{
WORD_VAL t;
t.Val = len + (len & 1);
debug("\r\nMACPUTARRAY %LX: ",len);
NICPut(ISR, 0x40);
NICPut(RBCR0, t.v[0]);
NICPut(RBCR1, t.v[1]);
NICPut(CMDR, 0x12);
// index bug corrected RJS 8/3/04
while ( t.val-- > 0 ) {
NICPut(NIC_DATAPORT, *val++);
debug("%X ",*(val-1));
}
// Make sure that DMA is complete.
len = 255;
while( len && (NICGet(ISR) & 0x40) == 0 )
len--;
}
/**
* Flush the MAC - transmit the current TX buffer
*/
void MACFlush(void)
{
BYTE i;
//Configure to send a packet. To configure the NIC to send a packet, 3 registers have to
//be set:
// - TPSR: This gives the NIC RAM page of the packet to send
// - TBCR0 & 1: These two resisters give the size of the packet to transmit
NICPut(TPSR, TxBuffers[MACCurrTxbuf].Index);
NICPut(CMDR, 0x24);
// After every transmission, adjust transmit pointer to
// next free transmit buffer.
for ( i = 0; i < MAX_DATA_BUFFERS; i++ )
{
if ( TxBuffers[i].bFree )
{
MACCurrTxbuf = i;
return;
}
}
}
/**
* Discard the contents of the current RX buffer.
*/
void MACRxbufDiscard(void)
{
BYTE newBoundary;
WORD_VAL t;
//Read the "Next Packet Pointer" from current MAC RX buffer. The first 4 bytes of the current
//buffer contains the status, next packet pointer and length bytes.
//Set
t.v[1] = MACCurrRxbuf; //Page poiner to current MAC Rx Buffer
t.v[0] = 1; //"Next packet pointer" is second byte of packet
NICSetAddr(t.Val);
newBoundary = MACRxbufGet();
//Update BNRY pointer with new value - this will remove current MAC RX Buffer from ring!
//NICPut(CMDR, 0x20); // Select PAGE 0, Abort remote DMA
NICPut(BNRY, newBoundary); //BNRY is the receive buffer's GET pointer
return;
}
void MACInit(void)
{
int8 i;
// On Init, all transmit buffers are free.
for ( i = 0; i < MAX_DATA_BUFFERS; i++ )
{
TxBuffers[i].Index = TXSTART + (i * (MAC_TX_BUFFER_SIZE/NIC_PAGE_SIZE));
TxBuffers[i].bFree = TRUE;
}
NICCurrentTxBuffer = 0;
NICReset();
delay_ms(2);
NICPut(NIC_RESET, NICGet(NIC_RESET));
delay_ms(2); // mimimum Delay of 1.6 ms
// Continue only if reset state is entered.
if ( (NICGet(ISR) & 0x80) != 0 )
{
// Select Page 0
NICPut(CMDR, 0x21);
delay_ms(2);
// Initialize Data Configuration Register
NICPut(DCR, DCRVAL);
// Clear Remote Byte Count Registers
NICPut(RBCR0, 0);
NICPut(RBCR1, 0);
// Initialize Receive Configuration Register
NICPut(RCR, 0x04);
// Place NIC in LOOPBACK mode 1
NICPut(TCR, 0x02);
// Initialize Transmit buffer queue
NICPut(TPSR, TxBuffers[NICCurrentTxBuffer].Index);
// Initialize Receive Buffer Ring
NICPut(PSTART, RXSTART);
NICPut(PSTOP, RXSTOP);
NICPut(BNRY, (BYTE)(RXSTOP-1));
// Initialize Interrupt Mask Register
// Clear all status bits
NICPut(ISR, 0xff);
// No interrupt enabled.
NICPut(IMR, 0x00);
// Select Page 1
NICPut(CMDR, 0x61);
// Initialize Physical Address Registers
NICPut(PAR0, MY_MAC_BYTE1);
NICPut(PAR0+1, MY_MAC_BYTE2);
NICPut(PAR0+2, MY_MAC_BYTE3);
NICPut(PAR0+3, MY_MAC_BYTE4);
NICPut(PAR0+4, MY_MAC_BYTE5);
NICPut(PAR0+5, MY_MAC_BYTE6);
// Initialize Multicast registers
for ( i = 0; i < 8; i++ )
NICPut(MAR0+i, 0xff);
// Initialize CURRent pointer
NICPut(CURRP, RXSTART);
// Remember current receive page
NICReadPtr = RXSTART;
// Page 0, Abort Remote DMA and Activate the transmitter.
NICPut(CMDR, 0x22);
// Set Normal Mode
NICPut(TCR, 0x00);
}
}
int1 MACGetHeader(MAC_ADDR *remote, int8* type)
{
NE_PREAMBLE header;
int8 NICWritePtr;
WORD_VAL temp;
*type = MAC_UNKNOWN;
// Reset NIC if overrun has occured.
if ( NICGet(ISR) & 0x10 )
{
#if 1
NICPut(CMDR, 0x21);
Delay(0xff);
NICPut(RBCR0, 0);
NICPut(RBCR1, 0);
NICPut(TCR, 0x02);
NICPut(CMDR, 0x20);
MACDiscardRx();
NICPut(ISR, 0xff);
NICPut(TCR, 0x00);
return FALSE;
#else
MACInit();
return FALSE;
#endif
}
NICPut(CMDR, 0x60);
NICWritePtr = NICGet(CURRP);
NICPut(CMDR, 0x20);
if ( NICWritePtr != NICReadPtr )
{
temp.v[1] = NICReadPtr;
temp.v[0] = 0;
NICSetAddr(temp.Val);
//MACGetArray((int8*)&header, sizeof(header));
debug("\r\n***************************************\r\n");
MACGetArray(&header, sizeof(NE_PREAMBLE));
debug(debug_putc,"\r\n\r\nGOT HDR = ST:%X NPP:%X LEN:%LU",
(int8)header.Status,header.NextPacketPointer,header.ReceivedBytes);
debug(debug_putc,"\r\n DEST: %X.%X.%X.%X.%X.%X SRC: %X.%X.%X.%X.%X.%X TYPE:%LX",
header.DestMACAddr.v[0],header.DestMACAddr.v[1],header.DestMACAddr.v[2],
header.DestMACAddr.v[3],header.DestMACAddr.v[4],header.DestMACAddr.v[5],
header.SourceMACAddr.v[0],header.SourceMACAddr.v[1],header.SourceMACAddr.v[2],
header.SourceMACAddr.v[3],header.SourceMACAddr.v[4],header.SourceMACAddr.v[5],
header.Type.Val);
// Validate packet length and status.
if ( header.Status.PRX && (header.ReceivedBytes >= MINFRAMEC) && (header.ReceivedBytes <= MAXFRAMEC) )
{
debug(debug_putc," VALID");
header.Type.Val = swaps(header.Type.Val);
//memcpy((char*)remote->v, (char*)header.SourceMACAddr.v, sizeof(*remote));
memcpy(&remote->v[0], &header.SourceMACAddr.v[0], sizeof(MAC_ADDR));
if ( (header.Type.v[1] == 0x08) && ((header.Type.v[0] == ETHER_IP) || (header.Type.v[0] == ETHER_ARP)) )
*type = header.Type.v[0];
}
NICCurrentRdPtr = NICReadPtr;
NICReadPtr = header.NextPacketPointer;
return TRUE;
}
return FALSE;
}
void MACInit(void)
{
BYTE i;
/* SBC45EC - use port B*/
#if defined(BRD_SBC44EC)
TRISB = 0xe0; //RB0-4 are outputs
//NIC_DISABLE_IOCHRDY can be defined if the MAC should NOT use the IOCHRDY signal on the RTL8019AS chip.
// - For SBC44EC PIC port pin B5 will be available for user IO. Solder jumper SJ5 must be opened!
#if !defined(NIC_DISABLE_IOCHRDY)
NIC_IOCHRDY_TRIS = 1; //IOCHRDY is an input
#endif
/* SBC45EC - use port A*/
#elif defined(BRD_SBC45EC)
TRISA = 0xd0; //RA0-3 and RA5 are outputs
//NIC_DISABLE_IOCHRDY can be defined if the MAC should NOT use the IOCHRDY signal on the RTL8019AS chip.
// - For SBC45EC PIC port pin A4 will be available for user IO. Solder jumper SJ5 must be opened!
#if !defined(NIC_DISABLE_IOCHRDY)
NIC_IOCHRDY_TRIS = 1; //IOCHRDY is an input
#endif
/* SBC65EC - use port E*/
#elif defined(BRD_SBC65EC)
TRISE = 0x00; //RE0-7 are outputs
//NIC_DISABLE_IOCHRDY can be defined if the MAC should NOT use the IOCHRDY signal on the RTL8019AS chip.
// - For SBC65EC and SBC68EC this frees up PIC pin RG4. This pin is currently however not routed to an connectors
//#if !defined(NIC_DISABLE_IOCHRDY)
NIC_IOCHRDY = 1;
NIC_IOCHRDY_TRIS = 1; //IOCHRDY is an input
//#endif
#endif
//Reset all error counters
#ifdef MAC_CNTR1_3
cntr0.Val = 0;
cntr1.Val = 0;
cntr2.Val = 0;
#endif
#if (DEBUG_MAC >= LOG_WARN)
cntrSum = 0;
#endif
// On Init, all transmit buffers are free.
for ( i = 0; i < MAX_DATA_BUFFERS; i++ )
{
//Set to NIC SRAM page
TxBuffers[i].Index = TXSTART + (i * (MAC_TX_BUFFER_SIZE/NIC_PAGE_SIZE));
TxBuffers[i].bFree = TRUE;
}
MACCurrTxbuf = 0;
NICReset();
DelayMs(5); // Give RTL8019AS time to load EEPROM values - takes about 2ms
NICPut(NIC_RESET, NICGet(NIC_RESET)); //Writing to NIC_RESET register caused NIC to reset
// mimimum Delay of 1.6 ms
DelayMs(5); // Give RTL8019AS time to load EEPROM values - takes about 2ms
//Some documentation states that reset bit is unreliable - only check it for 100ms
//if ( (NICGet(ISR) & 0x80) != 0 )
{
#if defined(BRD_SBC44EC) || defined(BRD_SBC45EC)
//Because the EEPROM read pin is floating on some boards, the registers initialized by the
//EEPROM will all contain non defined values. Write them with correct values
//MACInitEepromRegs(); // TEST TEST
#endif
// Select Page 0 AND issue STOP Command
NICPut(CMDR, 0x21);
DelayMs(5);
// Initialize Data Configuration Register
NICPut(DCR, DCRVAL);
// Clear Remote Byte Count Registers
NICPut(RBCR0, 0);
NICPut(RBCR1, 0);
// Initialize Receive Configuration Register
NICPut(RCR, 0x04);
// Place NIC in LOOPBACK mode 1
NICPut(TCR, 0x02);
// Initialize Transmit buffer queue
NICPut(TPSR, TxBuffers[MACCurrTxbuf].Index);
// Initialize Receive Buffer Ring
NICPut(PSTART, RXSTART);
NICPut(PSTOP, RXSTOP);
NICPut(BNRY, RXSTART); //Receive buffer GET pointer
// Initialize Interrupt Mask Register
// Clear all status bits
NICPut(ISR, 0xff);
// No interrupt enabled.
NICPut(IMR, 0x00);
// Select Page 1
NICPut(CMDR, 0x61);
// Initialize Physical Address Registers
NICPut(PAR0, MY_MAC_BYTE1);
NICPut(PAR0+1, MY_MAC_BYTE2);
NICPut(PAR0+2, MY_MAC_BYTE3);
NICPut(PAR0+3, MY_MAC_BYTE4);
NICPut(PAR0+4, MY_MAC_BYTE5);
NICPut(PAR0+5, MY_MAC_BYTE6);
// Initialize Multicast registers
for ( i = 0; i < 8; i++ )
NICPut(MAR0+i, 0xff);
// Initialize CURRent pointer - this is the RX Buffer PUT pointer
NICPut(CURRP, RXSTART);
// TCP layer uses this value to calculate window size. Without init the
// first window size value sent would be wrong if no packet has been received before.
MACCurrRxbuf = RXSTART;
// Page 0, Abort Remote DMA and Activate the transmitter.
NICPut(CMDR, 0x22);
// Set Normal Mode
NICPut(TCR, 0x00);
}
#if defined(BRD_SBC44EC) || defined(BRD_SBC45EC)
//Because the EEPROM read pin is floating on some boards, the registers initialized by the
//EEPROM will all contain non defined values. Write them with correct values
//MACInitEepromRegs(); // TEST TEST
#endif
//Disable RTL8019AS interrupts. All INT lines go tri-state, and PIC pin is available to user. The
//PIC port pin that becomes available is:
// - For SBC44EC this has no affect - no PIC pins are connected to the interrupt pins
// - For SBC45EC this has no affect - no PIC pins are connected to the interrupt pins
// - For SBC65EC and SBC68EC this frees up PIC pin RB0.
#if (defined(BRD_SBC65EC) || defined(BRD_SBC68EC)) && defined(NIC_DISABLE_INT0)
NICPut(CMDR, 0xe0); //Select page 3
NICPut(RTL9346CR, 0xc0); //Config register write enable
NICPut(RTLCONF1, 0); //Interrupt disable - will cause INT0 to be high impedance.
NICPut(RTL9346CR, 0x00); //Normal operating mode
NICPut(CMDR, 0x20); //Reset to default = Page 0
#endif
}
/**
* Check if the MAC Receive Buffer has any received packets.
* Reads the following data from the next available packet in the RX buffer: <ul>
* <li> The MAC 4 bytes RX packet header (status, nex receive packet, length) </li>
* <li> The 14 byte Ethernet header </li></ul>
* Once a data packet is fetched by calling MACRxbufGetHdr, the complete data
* packet must be fetched (using MACRxbufGet) and discarded (using MACRxbufDiscard).
* Users cannot call MACRxbufGetHdr multiple times to receive multiple packets
* and fetch data later on.
*
* @param[out] remote Pointer to a MAC_ADDR structure. This function will write the MAC address of the
* node who sent this packet to this structure
* @param[out] type Pointer to byte. This function will write the type of header to this variable.
* Can be ETHER_IP, ETHER_ARP or MAC_UNKNOWN
*
* @return True if RX Buffer contained a packet and it's header was read, False if not
*
*/
BOOL MACRxbufGetHdr(MAC_ADDR *remote, BYTE* type)
{
NE_PREAMBLE header;
BYTE NICWritePtr;
BYTE NICReadPtr;
WORD_VAL temp;
*type = MAC_UNKNOWN;
//Read CURR and BNDY registers = RX Buffer's GET and PUT pointers
NICPut(CMDR, 0x60); //Set page 1
NICWritePtr = NICGet(CURRP); //Curr is the RX Buffer's PUT pointer
NICPut(CMDR, 0x20); //Reset to page 0
NICReadPtr = NICGet(BNRY); //Get BNRY pointer
// Reset NIC if overrun has occured.
if ( NICGet(ISR) & 0x10 )
{
BYTE resend;
#if (DEBUG_MAC >= LOG_ERROR)
debugPutMsg(3); //@mxd:3:Overrun error! Reseting MAC!
#endif
// Save TXP bit
resend = NICGet(CMDR) & 0x04;
//Issue STOP command to NIC and delay 2ms
NICPut(CMDR, 0x21);
DelayMs(2);
//Clear Remote Byte count registers
NICPut(RBCR0, 0);
NICPut(RBCR1, 0);
// TXP bit set?
if (resend)
// No re-send if Packet Transmitted or Transmit Error bit is set
resend = !(NICGet(ISR) & 0x0A);
//Put NIC in loopback mode and issue start command
NICPut(TCR, 0x02);
NICPut(CMDR, 0x22); // HM: Modified, changed to 22 to re-start NIC
// Empty ring buffer completely
MACCurrRxbuf = NICWritePtr;
MACRxbufDiscard();
//Reset ISR by writing FF to it
NICPut(ISR, 0xff);
//Take NIC out of loopback mode
NICPut(TCR, 0x00);
//Resend the packet
if(resend)
NICPut(CMDR, 0x26);
return FALSE;
}
//Is there something in the buffer
if ( NICWritePtr != NICReadPtr )
{
temp.v[1] = NICReadPtr; //Pointer to RAM page, is MSB of address
temp.v[0] = 0; //LSB is 0
NICSetAddr(temp.Val);
//Read the following from the current MAC RX Buffer:
// - The MAC 4 bytes RX packet header (status, nex receive packet, length)
// - The 14 byte Ethernet header
MACRxbufGetArray((BYTE*)&header, sizeof(header));
// Validate packet length and status as.
if ( header.Status.PRX && (header.ReceivedBytes >= MINFRAMEC) && (header.ReceivedBytes <= MAXFRAMEC) &&
(header.NextPacketPointer < RXSTOP) && (header.NextPacketPointer >= RXSTART) )
{
header.Type.Val = swaps(header.Type.Val);
memcpy((void*)remote->v, (void*)header.SourceMACAddr.v, sizeof(*remote));
if ( (header.Type.v[1] == 0x08) && ((header.Type.v[0] == ETHER_IP) || (header.Type.v[0] == ETHER_ARP)) )
*type = header.Type.v[0];
MACCurrRxbuf = NICReadPtr; //Set MACCurrRxbuf with page address of current RX Buffer
return TRUE;
}
//ERROR!!! Invalid packet received!
#if (DEBUG_MAC >= LOG_ERROR)
debugPutMsg(4); //@mxd:4:Invalid Packet Error!
#endif
//Ring now contains garbage
MACCurrRxbuf = NICWritePtr; // Empty ring buffer completely
MACRxbufDiscard();
}
return FALSE;
}