void NICPut(int8 reg, int8 val)
{
WRITE_NIC_ADDR(reg);
NIC_DATA_LAT = val;
SET_NIC_WRITE();
NIC_IOW_LAT = 0;
NIC_IOW_LAT = 1;
SET_NIC_READ();
}
int8 NICGet(int8 reg)
{
int8 val;
SET_NIC_READ();
WRITE_NIC_ADDR(reg);
NIC_IOR_LAT = 0;
val = NIC_DATA_IO;
NIC_IOR_LAT = 1;
return val;
}
/**
* Write a byte to the I/O Port
*/
void NICPut(BYTE reg, BYTE val)
{
WRITE_NIC_ADDR(reg);
NIC_DATA_IO = val;
TRISD = 0x00; //Output
BEGIN_IO_CYCLE();
NIC_IOW_IO = 0;
WAIT_FOR_IOCHRDY();
NIC_IOW_IO = 1;
LEAVE_IO_CYCLE();
}
/**
* Read a byte from the I/O Port
*/
BYTE NICGet(BYTE reg)
{
BYTE val;
TRISD = 0xff; //Input
WRITE_NIC_ADDR(reg);
BEGIN_IO_CYCLE();
NIC_IOR_IO = 0;
WAIT_FOR_IOCHRDY();
val = NIC_DATA_IO;
NIC_IOR_IO = 1;
LEAVE_IO_CYCLE();
return val;
}
/**
* Reads a single byte via Remote DMA from the current MAC Receive buffer.
* If the last byte of the RX Buffer was read, this function automatically
* updates the Remote DMA read address to the first page of the RX Buffer.
* See PreConditions for more info.
*
* @preCondition: Remote DMA address has to be set up prior to calling this function.
* The Remote DMA registers are NOT configured by this function,
* and simply continue reading from the current "Remote DMA Address". A function
* like MACRxbufGetHdr() can be called prior to this function to configure Remote
* DMA to read the next packet in RX Buffer (situated in Remote DMA RAM)
*
* @return Read byte
*/
BYTE MACRxbufGet(void)
{
#if defined(__18CXX)
overlay
#endif
BYTE b;
//Configure RBCR (Remote Byte Count Register) for bytes to be read via DMA
FirstFastNICPut(RBCR0, 1);
FastNICPut(RBCR1, 0);
//Last byte of MAC RX Buffer is read wronge by RTL8019AS - Address has to be set again!
if ((DMAAddr.v[0] == 0xff) && (DMAAddr.v[1] == (RXSTOP-1))) {
//Set NIC Remote DMA read again - this fixes the RTL8019AS bug!!!!
NICSetAddr((RXSTOP << 8) - 1);
//Remote DMA Read command. This causes given (RBCR0 & 1) number of bytes, starting at given
//address (RSAR0 & 1) set by NICSetAddr() to be read with each I/O read cycle.
FastNICPut(CMDR, 0x0a);
b = NICGet(NIC_DATAPORT); //Read I/O port
//Reset to first byte of MAC RX Buffer - this function also updates DMAAddr
//This fixes the RTL8019AS bug where the address point is not updated to first byte of Receive Buffer
NICSetAddr(RXSTART << 8);
}
else {
//Remote DMA Read command. This causes given (RBCR0 & 1) number of bytes, starting at given
//address (RSAR0 & 1) set by NICSetAddr() to be read with each I/O read cycle.
FastNICPut(CMDR, 0x0a);
//Read a byte from the I/O port
TRISD = 0xff; //Input
WRITE_NIC_ADDR(NIC_DATAPORT);
BEGIN_IO_CYCLE();
NIC_IOR_IO = 0;
WAIT_FOR_IOCHRDY();
b = NIC_DATA_IO;
NIC_IOR_IO = 1;
LEAVE_IO_CYCLE();
//The above I/O port operation updated the Remote DMA address
DMAAddr.Val++;
}
return (b);
}
/**
* Reads the given amount of bytes via Remote DMA from the current MAC Receive buffer.
* If the end of the RX Buffer is reached, this function automatically rolls over to
* the first page of the RX Ring Buffer. See PreConditions above for more info.
*
* @preCondition Remote DMA address has to be set up prior to calling this function.
* The Remote DMA registers are NOT configured by this function,
* and simply continue reading from the current "Remote DMA Address". A function
* like MACRxbufGetHdr() can be called prior to this function to configure Remote
* DMA to read the next packet in RX Buffer (situated in Remote DMA RAM)
*
* @param len Length of array to be read
* @param val Buffer to read packet into
*
* @return Number of bytes read
*
*/
WORD MACRxbufGetArray(BYTE *val, WORD len)
{
#if defined(__18CXX)
overlay
#endif
WORD_VAL t;
t.Val = len;
//Configure RBCR (Remote Byte Count Register) for bytes to be read via DMA
FirstFastNICPut(RBCR0, t.byte.LSB);
FastNICPut(RBCR1, t.byte.MSB);
//Remote DMA Read command. This causes given (RBCR0 & 1) number of bytes, starting at given
//address (RSAR0 & 1) set by NICSetAddr() to be read with each I/O read cycle.
FastNICPut(CMDR, 0x0a);
//Update DMAAddr for what it will be after all requested bytes are read
DMAAddr.Val += len;
if (DMAAddr.v[1] >= RXSTOP) {
//If end of MAC Receive buffer is reached, roll over to beginning of buffer
DMAAddr.Val -= (RXPAGES << 8);
}
//Read requested number of bytes from I/O port
TRISD = 0xff; //Input
WRITE_NIC_ADDR(NIC_DATAPORT);
while( len-- > 0 )
{
BEGIN_IO_CYCLE();
NIC_IOR_IO = 0;
WAIT_FOR_IOCHRDY();
*val++ = NIC_DATA_IO;
NIC_IOR_IO = 1;
LEAVE_IO_CYCLE();
}
#if (DEBUG_MAC >= LOG_ERROR)
if (DMAAddr.Val != MACGetNICAddr()) {
debugPutMsg(2);
}
#endif
return t.Val;
}
void NICReset(void)
{
SET_NIC_READ();
WRITE_NIC_ADDR(0);
NIC_IOW_LAT = 1;
NIC_IOR_LAT = 1;
NIC_RESET_LAT = 1;
NIC_RESET_TRIS=0;
NIC_IOW_TRIS=0;
NIC_IOR_TRIS=0;
// Reset pulse must be at least 800 ns.
delay_us(10);
NIC_RESET_LAT = 0;
}
/**
* Reset the NIC
*/
void NICReset(void)
{
#if (DEBUG_MAC >= LOG_INFO)
debugPutMsg(5); //@mxd:5:Reset MAC
#endif
TRISD = 0xff; //Input
WRITE_NIC_ADDR(0);
NIC_IOW_IO = 1;
NIC_IOR_IO = 1;
NIC_RESET_IO = 1;
NIC_CTRL_TRIS = 0x00;
// Reset pulse must be at least 800 ns.
Delay10us(1);
DelayMs(5);
NIC_RESET_IO = 0;
}
