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enc28j60.c
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#include "enc28j60.h"
#ifndef Arduino_h
void delay(unsigned long);
#endif
/******************************************************************************
* APPLICATION LAYER VARIABLES
*****************************************************************************/
static WORD_VAL NextPacketLocation;
static WORD_VAL CurrentPacketLocation;
static unsigned char Enc28j60Bank;
/******************************************************************************
* HARDWARE LAYER METHOD DECLARATIONS
*****************************************************************************/
static void enc28j60SetBank(uint8_t address);
static void enc28j60WriteOp(uint8_t op, uint8_t address, uint8_t data);
static void enc28j60Write(uint8_t address, uint8_t data);
static uint8_t enc28j60ReadOp(uint8_t op, uint8_t address);
static uint8_t enc28j60Read(uint8_t address);
static void enc28j60ReadBuffer(uint16_t len, uint8_t* data);
static void enc28j60PhyWrite(uint8_t address, uint16_t data);
static void enc28j60WriteBuffer(uint16_t len, uint8_t* data);
/******************************************************************************
* APPLICATION LAYER
*****************************************************************************/
/******************************************************************************
* Function: void MACInit(void)
*
* PreCondition: none
*
* Input: none
*
* Output: None
*
* Side Effects: none
*
* Overview: Init. ENC28J60 hardware
*
* Note: None
*****************************************************************************/
void MACInit(void)
{
// 1.
NextPacketLocation.Val = 0;
CurrentPacketLocation.Val = 0;
// RESET the entire ENC28J60, clearing all registers
MACSendSystemReset();
// Start up in Bank 0 and configure the receive buffer boundary pointers
// and the buffer write protect pointer (receive buffer read pointer)
NextPacketLocation.Val = RXSTART_INIT;
CurrentPacketLocation.Val = RXSTART_INIT;
enc28j60Write(ERXSTL, low(RXSTART_INIT));
enc28j60Write(ERXSTH, high(RXSTART_INIT));
enc28j60Write(ERXRDPTL, low(RXSTART_INIT)); // Write low byte first
enc28j60Write(ERXRDPTH, high(RXSTART_INIT)); // Write high byte last
enc28j60Write(ERXNDL, low(RXSTOP_INIT));
enc28j60Write(ERXNDH, high(RXSTOP_INIT));
enc28j60Write(ETXSTL, low(TXSTART_INIT));
enc28j60Write(ETXSTH, high(TXSTART_INIT));
// Enter Bank 1 and configure Receive Filters
// For broadcast packets we allow only ARP packtets
// All other packets should be unicast only for our mac (MAADR)
//
// The pattern to match on is therefore
// Type ETH.DST
// ARP BROADCAST
// 06 08 -- ff ff ff ff ff ff -> ip checksum for theses bytes=f7f9
// in binary these poitions are:11 0000 0011 1111
// This is hex 303F->EPMM0=0x3f,EPMM1=0x30
enc28j60Write(ERXFCON, ERXFCON_UCEN|ERXFCON_CRCEN|ERXFCON_PMEN);
enc28j60Write(EPMM0, 0x3F);
enc28j60Write(EPMM1, 0x30);
enc28j60Write(EPMCSL, 0xF9);
enc28j60Write(EPMCSH, 0xF7);
// promiscuous mode
//enc28j60Write(ERXFCON, ERXFCON_CRCEN);
// Disable the CLKOUT output to reduce EMI generation
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECOCON, 0x00); // Output off (0V)
//enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECOCON, 0x01); // 25.000MHz
//enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECOCON, 0x03); // 8.3333MHz (*4 with PLL is 33.3333MHz)
// Enable the receive portion of the MAC
// full duplex
//enc28j60Write(MACON1, (MACON1_MARXEN | MACON1_TXPAUS | MACON1_RXPAUS));
// half duplex
enc28j60Write(MACON1, MACON1_MARXEN);
// bring MAC out of reset
enc28j60Write(MACON2, 0x00);
// Pad packets to 60 bytes, add CRC, and check Type/Length field.
// full duplex
//enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, MACON3,
// MACON3_PADCFG0 | MACON3_TXCRCEN | MACON3_FRMLNEN | MACON3_FULDPX);
// half duplex
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, MACON3,
MACON3_PADCFG0 | MACON3_TXCRCEN | MACON3_FRMLNEN);
// Allow infinite deferals if the medium is continuously busy
// (do not time out a transmission if the half duplex medium is
// completely saturated with other people's data)
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, MACON4, MACON4_DEFER);
// Clear because we are in full duplex mode
//enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, MACON4, MACON4_DEFER);
// Set the maximum packet size which the controller will accept
unsigned int limit = 1518; // 6+6+2+1500+4
// 1518 is the IEEE 802.3 specified limit
enc28j60Write(MAMXFLL, low(limit));
enc28j60Write(MAMXFLH, high(limit));
// set inter-frame gap (back-to-back)
// half duplex
enc28j60Write(MABBIPG, 0x12);
// full duplex
//enc28j60Write(MABBIPG, 0x15);
// set inter-frame gap (non-back-to-back)
enc28j60Write(MAIPGL, 0x12);
// half duplex
enc28j60Write(MAIPGH, 0x00);
// full duplex
//enc28j60Write(MAIPGH, 0x0C);
// Late collisions occur beyond 63+8 bytes (8 bytes for preamble/start of frame delimiter)
// 55 is all that is needed for IEEE 802.3, but ENC28J60 B5 errata for improper link pulse
// collisions will occur less often with a larger number.
enc28j60Write(MACLCON2, 63);
}
/******************************************************************************
* Function: void MACOpen(void)
*
* PreCondition: none
*
* Input: none
*
* Output: None
*
* Side Effects: none
*
* Overview: Open ENC28J60 hardware
*
* Note: None
*****************************************************************************/
void MACOpen(void)
{
// 4.
// Set the MAC and PHY into the proper duplex state
//enc28j60PhyWrite(PHCON1, PHCON1_PDPXMD);
enc28j60PhyWrite(PHCON1, 0x0000);
// Disable half duplex loopback in PHY. Bank bits changed to Bank 2 as a
// side effect.
// no loopback of transmitted frames
enc28j60PhyWrite(PHCON2, PHCON2_HDLDIS);
// switch to bank 0
enc28j60SetBank(ECON1);
}
/******************************************************************************
* Function: void MACEnableRecv(void)
*
* PreCondition: none
*
* Input: none
*
* Output: None
*
* Side Effects: none
*
* Overview: Enable ENC28J60 hardware receiving status
*
* Note: None
*****************************************************************************/
void MACEnableRecv(void)
{
// 5.
// enable interrutps
//enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, EIE, EIE_INTIE|EIE_PKTIE);
// enable packet reception
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON1, ECON1_RXEN);
}
/******************************************************************************
* Function: void MACInitMacAddr(unsigned char *_macadd)
*
* PreCondition: none
*
* Input: none
*
* Output: None
*
* Side Effects: none
*
* Overview: Init ENC28J60 hardware MAC address
*
* Note: None
*****************************************************************************/
void MACInitMacAddr(unsigned char *_macadd)
{
// 2.
// write MAC address
// NOTE: MAC address in ENC28J60 is byte-backward
enc28j60Write(MAADR5, _macadd[0]);
enc28j60Write(MAADR4, _macadd[1]);
enc28j60Write(MAADR3, _macadd[2]);
enc28j60Write(MAADR2, _macadd[3]);
enc28j60Write(MAADR1, _macadd[4]);
enc28j60Write(MAADR0, _macadd[5]);
}
/******************************************************************************
* Function: unsigned char MACHardwareRevision(void)
*
* PreCondition: Must call MACOpen() first
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Returns hardware revision
*
* Note: None
*****************************************************************************/
unsigned char MACHardwareRevision(void)
{
return enc28j60Read(EREVID);
}
/******************************************************************************
* Function: void MACSendSystemReset(void)
*
* PreCondition: SPI bus must be initialized (done in MACInit()).
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: MACSendSystemReset sends the System Reset SPI command to
* the Ethernet controller. It resets all register contents
* (except for ECOCON) and returns the device to the power
* on default state.
*
* Note: None
*****************************************************************************/
void MACSendSystemReset(void)
{
// perform system reset
enc28j60WriteOp(ENC28J60_SOFT_RESET, 0, ENC28J60_SOFT_RESET);
delay(50);
}//end MACSendSystemReset
/******************************************************************************
* Function: unsigned char MACGetPacketCount(void)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Check EPKTCNT to know how many packets arrived
*
* Note: None
*****************************************************************************/
unsigned char MACGetPacketCount(void)
{
return enc28j60Read(EPKTCNT);
}
/******************************************************************************
* Function: void MACReadRXBuffer(unsigned char* _buf, unsigned int _size)
*
* PreCondition: none
*
* Input: *_buf: buffer to write data read
* _size: amount data to read
*
* Output: None
*
* Side Effects: Last packet is discarded if MACDiscardRx() hasn't already
* been called.
*
* Overview: None
*
* Note: None
*****************************************************************************/
void MACReadRXBuffer(unsigned char* _buf, unsigned int _size)
{
uint16_t rxstat;
uint16_t len;
// Set the read pointer to the start of the received packet
enc28j60Write(ERDPTL, CurrentPacketLocation.Byte.LB);
enc28j60Write(ERDPTH, CurrentPacketLocation.Byte.HB);
// read the next packet pointer
NextPacketLocation.Byte.LB = enc28j60ReadOp(ENC28J60_READ_BUF_MEM, 0);
NextPacketLocation.Byte.HB = enc28j60ReadOp(ENC28J60_READ_BUF_MEM, 0);
// read the packet length (see datasheet page 43)
len = enc28j60ReadOp(ENC28J60_READ_BUF_MEM, 0);
len |= enc28j60ReadOp(ENC28J60_READ_BUF_MEM, 0)<<8;
len-=4; //remove the CRC count
// read the receive status (see datasheet page 43)
rxstat = enc28j60ReadOp(ENC28J60_READ_BUF_MEM, 0);
rxstat |= enc28j60ReadOp(ENC28J60_READ_BUF_MEM, 0)<<8;
// limit retrieve length
if (len > _size) len = _size;
// copy the packet from the receive buffer
enc28j60ReadBuffer(len, _buf);
}
/******************************************************************************
* Function: void MACDiscardRx(void)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Marks the last received packet (obtained using
* MACGetHeader())as being processed and frees the buffer
* memory associated with it
*
* Note: Is is safe to call this function multiple times between
* MACGetHeader() calls. Extra packets won't be thrown away
* until MACGetHeader() makes it available.
*****************************************************************************/
void MACDiscardRx(void)
{
// Update Current pointer
CurrentPacketLocation.Val = NextPacketLocation.Val;
enc28j60Write(ERXRDPTL, NextPacketLocation.Byte.LB);
enc28j60Write(ERXRDPTH, NextPacketLocation.Byte.HB);
// decrement the packet counter indicate we are done with this packet
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON2, ECON2_PKTDEC);
}
/******************************************************************************
* Function: void MACWriteTXBuffer(unsigned char* _buf, unsigned int _size)
*
* PreCondition: none
*
* Input: *_buf: buffer to write data
* _size: amount data to write
*
* Output: None
*
* Side Effects: None
*
* Overview: Writes bytes to TX Buffer space
*
* Note: None
*****************************************************************************/
void MACWriteTXBuffer(unsigned char* _buf, unsigned int _size)
{
MACWriteTXBufferOffset(_buf, _size, 0);
}
/******************************************************************************
* Function: void MACWriteTXBufferOffset(unsigned char* _buf, unsigned int _size, unsigned int offset_len)
*
* PreCondition: none
*
* Input: *_buf: buffer to write data
* _size: amount data to write
* offset:memory pointer to write data
*
* Output: None
*
* Side Effects: None
*
* Overview: Writes bytes to TX Buffer space and skips offset
*
* Note: None
*****************************************************************************/
void MACWriteTXBufferOffset(unsigned char* _buf, unsigned int _size, unsigned int offset_len)
{
// calc offset
unsigned int offsetStart = TXSTART_INIT + offset_len;
unsigned int offsetEnd = offsetStart + _size;
// Set the write pointer to start of transmit buffer area
enc28j60Write(EWRPTL, low(offsetStart));
enc28j60Write(EWRPTH, high(offsetStart));
// Set the TXND pointer to correspond to the packet size given
enc28j60Write(ETXNDL, low(offsetEnd));
enc28j60Write(ETXNDH, high(offsetEnd));
// write per-packet control byte (0x00 means use macon3 settings)
enc28j60WriteOp(ENC28J60_WRITE_BUF_MEM, 0, 0x00);
// copy the packet into the transmit buffer
enc28j60WriteBuffer(_size, _buf);
}
/******************************************************************************
* Function: void MACSendTx(void)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Send Tx buffer
*
* Note: None
*****************************************************************************/
void MACSendTx(void)
{
// clear TXIF and config transmit interrupt if the case
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, EIR, EIR_TXERIF);
// send the contents of the transmit buffer onto the network
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON1, ECON1_TXRTS);
}
/******************************************************************************
* Function: BOOL IsMACSendTx(void)
*
* PreCondition: None
*
* Input: None
*
* Output: Returns true if TX send flag was cleared
*
* Side Effects: None
*
* Overview: Check for Send Tx flag
*
* Note: None
*****************************************************************************/
BOOL IsMACSendTx(void)
{
return !((enc28j60Read(ECON1) & ECON1_TXRTS) == ECON1_TXRTS);
}
/******************************************************************************
* SOCKET APPLICATION LAYER
*****************************************************************************/
/******************************************************************************
* Function: void SOCKETReadBuffer(unsigned char* _buf, unsigned int _size, unsigned int _start)
*
* PreCondition: none
*
* Input: *_buf: buffer to write data read
* _size: amount data to read
* _start: socket's buffer start address
*
* Output: None
*
* Side Effects: interfere in ERDPT pointer
*
* Overview: Reads bytes from Socket RX/TX Buffer space
*
* Note: None
*****************************************************************************/
void SOCKETReadBuffer(unsigned char* _buf, unsigned int _size, unsigned int _start)
{
// Set the read pointer to the start of the packet kept in the socket buffer
enc28j60Write(ERDPTL, low(_start));
enc28j60Write(ERDPTH, high(_start));
//delay(1);
// copy the packet from the socket buffer
enc28j60ReadBuffer(_size, _buf);
}
/******************************************************************************
* Function: void SOCKETWriteBuffer(unsigned char* _buf, unsigned int _size, unsigned int _start)
*
* PreCondition: none
*
* Input: *_buf: buffer to write data
* _size: amount data to write
* _start: socket's buffer start address
*
* Output: None
*
* Side Effects: None
*
* Overview: Writes bytes to Socket RX/TX Buffer space
*
* Note: None
*****************************************************************************/
void SOCKETWriteBuffer(unsigned char* _buf, unsigned int _size, unsigned int _start)
{
// Set the write pointer to start of socket buffer area
enc28j60Write(EWRPTL, low(_start));
enc28j60Write(EWRPTH, high(_start));
// copy the packet into the socket buffer
enc28j60WriteBuffer(_size, _buf);
}
/******************************************************************************
* Function: unsigned int SOCKETGetRxPointer()
*
* PreCondition: none
*
* Input: None
*
* Output: RX pointer location
*
* Side Effects: None
*
* Overview: Retrieves RX pointer location
*
* Note: None
*****************************************************************************/
unsigned int SOCKETGetRxPointer()
{
unsigned int addrTmp;
addrTmp = enc28j60Read(ERDPTL);
addrTmp |= enc28j60Read(ERDPTH) << 8;
return addrTmp;
}
/******************************************************************************
* Function: void SOCKETSetRxPointer(unsigned int addr)
*
* PreCondition: none
*
* Input: addr = Address to set RX pointer to.
*
* Output: None
*
* Side Effects: None
*
* Overview: Sets RX pointer location
*
* Note: None
*****************************************************************************/
void SOCKETSetRxPointer(unsigned int addr)
{
enc28j60Write(ERDPTL, low(addr));
enc28j60Write(ERDPTH, high(addr));
}
/******************************************************************************
* Function: unsigned int SOCKETGetTxPointer()
*
* PreCondition: none
*
* Input: None
*
* Output: TX pointer location
*
* Side Effects: None
*
* Overview: Retrieves TX pointer location
*
* Note: None
*****************************************************************************/
unsigned int SOCKETGetTxPointer()
{
unsigned int addrTmp;
addrTmp = enc28j60Read(EWRPTL);
addrTmp |= enc28j60Read(EWRPTH) << 8;
return addrTmp;
}
/******************************************************************************
* Function: void SOCKETSetTxPointer(unsigned int addr)
*
* PreCondition: none
*
* Input: addr = Address to set TX pointer to.
*
* Output: None
*
* Side Effects: None
*
* Overview: Sets TX pointer location
*
* Note: None
*****************************************************************************/
void SOCKETSetTxPointer(unsigned int addr)
{
enc28j60Write(EWRPTL, low(addr));
enc28j60Write(EWRPTH, high(addr));
}
/******************************************************************************
* DMA COPY LAYER
*****************************************************************************/
/******************************************************************************
* Function: void MACMemCopyAsync(FLOW flow, unsigned int destAddr, unsigned int len)
*
* PreCondition: SPI bus must be initialized (done in MACInit()).
*
* Input: destAddr: Destination address in the Ethernet memory to
* copy to. If (PTR_BASE)-1 is specified, the
* current EWRPT value will be used instead.
* sourceAddr: Source address to read from. If (PTR_BASE)-1 is
* specified, the current ERDPT value will be used
* instead.
* len: Number of bytes to copy
*
* Output: None
*
* Side Effects: Moves read and write pointers. DMA conflict with transmitting and receiving
*
* Overview: Bytes are asynchrnously transfered within the buffer. Call
* MACIsMemCopyDone() to see when the transfer is complete.
*
* Note: If a prior transfer is already in progress prior to
* calling this function, this function will block until it
* can start this transfer.
*
* If (PTR_BASE)-1 is used for the sourceAddr or destAddr
* parameters, then that pointer will get updated with the
* next address after the read or write.
*****************************************************************************/
void DMACopyTo(FLOW flow, unsigned int destAddr, unsigned int len)
{
unsigned int sourceAddr = RXSTART_INIT;
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECON1, ECON1_CSUMEN);
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECON1, ECON1_DMAST);
// Defining source address by read or write pointer
if (flow == RX)
{
if ((CurrentPacketLocation.Val + RXD_STATUS_VECTOR_SIZE) <= RXSTOP_INIT)
{
sourceAddr = CurrentPacketLocation.Val + RXD_STATUS_VECTOR_SIZE;
}
else
{
unsigned int rest = (CurrentPacketLocation.Val + RXD_STATUS_VECTOR_SIZE) - RXSTOP_INIT;
sourceAddr = rest - 1;
}
}
else if (flow == TX)
{
sourceAddr = TXSTART_INIT;
}
// Source Init Address
enc28j60Write(EDMASTL, low(sourceAddr));
enc28j60Write(EDMASTH, high(sourceAddr));
// Source Stop Address
// Need compensate circular buffer WHEN RX COPY !!!
unsigned int floatingEnd = (sourceAddr + len);
if (flow == RX)
{
if (floatingEnd >= RXSTOP_INIT)
{
// Adjusting END for DMA copy
// otherwise it will never reach end pointer
// and never get it done
unsigned int tempEnd = (floatingEnd - RXSTOP_INIT);
if (tempEnd > 0) tempEnd--;
floatingEnd = tempEnd;
}
}
// Source Stop Address
enc28j60Write(EDMANDL, low(floatingEnd));
enc28j60Write(EDMANDH, high(floatingEnd));
// Destination Init Address
enc28j60Write(EDMADSTL, low(destAddr));
enc28j60Write(EDMADSTH, high(destAddr));
// Clear flag
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, EIR, EIR_DMAIF);
// Execute!
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON1, ECON1_DMAST);
}
/******************************************************************************
* Function: void MACMemCopyAsync(FLOW flow, unsigned int destAddr, unsigned int len)
*
* PreCondition: SPI bus must be initialized (done in MACInit()).
*
* Input: destAddr: Destination address in the Ethernet memory to
* copy to. If (PTR_BASE)-1 is specified, the
* current EWRPT value will be used instead.
* sourceAddr: Source address to read from. If (PTR_BASE)-1 is
* specified, the current ERDPT value will be used
* instead.
* len: Number of bytes to copy
*
* Output: None
*
* Side Effects: Moves read and write pointers. DMA conflict with transmitting and receiving
*
* Overview: Bytes are asynchrnously transfered within the buffer. Call
* MACIsMemCopyDone() to see when the transfer is complete.
*
* Note: If a prior transfer is already in progress prior to
* calling this function, this function will block until it
* can start this transfer.
*
* If (PTR_BASE)-1 is used for the sourceAddr or destAddr
* parameters, then that pointer will get updated with the
* next address after the read or write.
*****************************************************************************/
void DMACopyFrom(FLOW flow, unsigned int sourceAddr, unsigned int len)
{
unsigned int destAddr = TXSTART_INIT;
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECON1, ECON1_CSUMEN);
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECON1, ECON1_DMAST);
// Defining source address by read or write pointer
if (flow == RX)
{
destAddr = NextPacketLocation.Val;
}
else if (flow == TX)
{
destAddr = TXSTART_INIT + 1;
// write per-packet control byte (0x00 means use macon3 settings)
enc28j60WriteOp(ENC28J60_WRITE_BUF_MEM, 0, 0x00);
}
// Source Init Address
enc28j60Write(EDMASTL, low(sourceAddr));
enc28j60Write(EDMASTH, high(sourceAddr));
// Source Stop Address
enc28j60Write(EDMANDL, low((sourceAddr + len))); // + RXD_STATUS_VECTOR_SIZE));
enc28j60Write(EDMANDH, high((sourceAddr + len))); // + RXD_STATUS_VECTOR_SIZE));
// Destination Init Address
enc28j60Write(EDMADSTL, low(destAddr));
enc28j60Write(EDMADSTH, high(destAddr));
// Clear flag
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, EIR, EIR_DMAIF);
// Execute!
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON1, ECON1_DMAST);
if (flow == TX)
{
// Set the write pointer to start of transmit buffer area
enc28j60Write(EWRPTL, low((destAddr - 1)));
enc28j60Write(EWRPTH, high((destAddr - 1)));
// Set the TXND pointer to correspond to the packet size given
enc28j60Write(ETXNDL, low(((destAddr - 1) + len)));
enc28j60Write(ETXNDH, high(((destAddr - 1) + len)));
}
}
/******************************************************************************
* Function: BOOL IsDMACopyDone(void)
*
* PreCondition: None
*
* Input: None
*
* Output: Returns true if DMA flag was cleared
*
* Side Effects: None
*
* Overview: Check for DMA flag
*
* Note: None
*****************************************************************************/
BOOL IsDMACopyDone(void)
{
return !((enc28j60Read(ECON1) & ECON1_DMAST) == ECON1_DMAST);
}
/******************************************************************************
* HARDWARE LAYER
*****************************************************************************/
/******************************************************************************
* Function: static void enc28j60SetBank(uint8_t address)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Performs set bank operation
*
* Note: None
*****************************************************************************/
static void enc28j60SetBank(uint8_t address)
{
// set the bank (if needed)
if((address & BANK_MASK) != Enc28j60Bank)
{
// set the bank
enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECON1, (ECON1_BSEL1|ECON1_BSEL0));
enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON1, (address & BANK_MASK)>>5);
Enc28j60Bank = (address & BANK_MASK);
}
}
/******************************************************************************
* Function: static void enc28j60WriteOp(uint8_t op, uint8_t address, uint8_t data)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Performs write of an operational register normally MAC operations
*
* Note: None
*****************************************************************************/
static void enc28j60WriteOp(uint8_t op, uint8_t address, uint8_t data)
{
CSACTIVE;
// issue write command
SPDR = op | (address & ADDR_MASK);
waitspi();
// write data
SPDR = data;
waitspi();
CSPASSIVE;
}
/******************************************************************************
* Function: static void enc28j60Write(uint8_t address, uint8_t data)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Performs write of a control register
*
* Note: None
*****************************************************************************/
static void enc28j60Write(uint8_t address, uint8_t data)
{
// set the bank
enc28j60SetBank(address);
// do the write
enc28j60WriteOp(ENC28J60_WRITE_CTRL_REG, address, data);
}
/******************************************************************************
* Function: static void enc28j60WriteBuffer(uint16_t len, uint8_t* data)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Performs write buffer memory
*
* Note: None
*****************************************************************************/
static void enc28j60WriteBuffer(uint16_t len, uint8_t* data)
{
CSACTIVE;
// issue write command
SPDR = ENC28J60_WRITE_BUF_MEM;
waitspi();
while(len)
{
len--;
// read data
SPDR = *data;
waitspi();
if (len) data++;
}
// release CS
CSPASSIVE;
}
/******************************************************************************
* Function: static uint8_t enc28j60Read(uint8_t address)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Performs read of a control register
*
* Note: None
*****************************************************************************/
static uint8_t enc28j60ReadOp(uint8_t op, uint8_t address)
{
CSACTIVE;
// issue read command
SPDR = op | (address & ADDR_MASK);
waitspi();
// read data
SPDR = 0x00;
waitspi();
// do dummy read if needed (for mac and mii, see datasheet page 29)
if(address & 0x80)
{
SPDR = 0x00;
waitspi();
}
// release CS
CSPASSIVE;
return(SPDR);
}
/******************************************************************************