unsigned char OpenSocket(unsigned char sock, unsigned char eth_protocol,
unsigned int tcp_port)
{
unsigned char retval;
unsigned int sockaddr;
retval = W5100_FAIL; // assume this doesn't work
if (sock >= W5100_NUM_SOCKETS)
return retval; // illegal socket value is bad!
sockaddr = W5100_SKT_BASE(sock); // calc base addr for this socket
if (W51_read(sockaddr + W5100_SR_OFFSET) == W5100_SKT_SR_CLOSED) // Make sure we close the socket first
{
CloseSocket(sock);
}
W51_write(sockaddr + W5100_MR_OFFSET, eth_protocol); // set protocol for this socket
W51_write(sockaddr + W5100_PORT_OFFSET, ((tcp_port & 0xFF00) >> 8)); // set port for this socket (MSB)
W51_write(sockaddr + W5100_PORT_OFFSET + 1, (tcp_port & 0x00FF)); // set port for this socket (LSB)
W51_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_OPEN); // open the socket
while (W51_read(sockaddr + W5100_CR_OFFSET)) ; // loop until device reports socket is open (blocks!!)
if (W51_read(sockaddr + W5100_SR_OFFSET) == W5100_SKT_SR_INIT)
retval = sock; // if success, return socket number
else
CloseSocket(sock); // if failed, close socket immediately
return retval;
}
unsigned int ReceivedSize(unsigned char sock)
{
unsigned int val;
unsigned int sockaddr;
if (sock >= W5100_NUM_SOCKETS)
return 0;
sockaddr = W5100_SKT_BASE(sock); // calc base addr for this socket
val = W51_read(sockaddr + W5100_RX_RSR_OFFSET) & 0xff;
val = (val << 8) + W51_read(sockaddr + W5100_RX_RSR_OFFSET + 1);
return val;
}
unsigned char Send(unsigned char sock, const unsigned char *buf,
unsigned int buflen)
{
unsigned int ptr;
unsigned int offaddr;
unsigned int realaddr;
unsigned int txsize;
unsigned int timeout;
unsigned int sockaddr;
if (buflen == 0 || sock >= W5100_NUM_SOCKETS)
return W5100_FAIL; // ignore illegal requests
sockaddr = W5100_SKT_BASE(sock); // calc base addr for this socket
// Make sure the TX Free Size Register is available
txsize = W51_read(sockaddr + W5100_TX_FSR_OFFSET); // make sure the TX free-size reg is available
txsize =
(((txsize & 0x00FF) << 8) +
W51_read(sockaddr + W5100_TX_FSR_OFFSET + 1));
timeout = 0;
while (txsize < buflen) {
_delay_ms(1);
txsize = W51_read(sockaddr + W5100_TX_FSR_OFFSET); // make sure the TX free-size reg is available
txsize =
(((txsize & 0x00FF) << 8) +
W51_read(sockaddr + W5100_TX_FSR_OFFSET + 1));
if (timeout++ > 1000) // if max delay has passed...
{
DisconnectSocket(sock); // can't connect, close it down
return W5100_FAIL; // show failure
}
}
// Read the Tx Write Pointer
ptr = W51_read(sockaddr + W5100_TX_WR_OFFSET);
offaddr =
(((ptr & 0x00FF) << 8) +
W51_read(sockaddr + W5100_TX_WR_OFFSET + 1));
while (buflen) {
buflen--;
realaddr = (W5100_TXBUFADDR + (0x0800 * sock)) + (offaddr & W5100_TX_BUF_MASK); // calc W5100 physical buffer addr for this socket
W51_write(realaddr, *buf); // send a byte of application data to TX buffer
offaddr++; // next TX buffer addr
buf++; // next input buffer addr
}
W51_write(sockaddr + W5100_TX_WR_OFFSET, (offaddr & 0xFF00) >> 8); // send MSB of new write-pointer addr
W51_write(sockaddr + W5100_TX_WR_OFFSET + 1, (offaddr & 0x00FF)); // send LSB
W51_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_SEND); // start the send on its way
while (W51_read(sockaddr + W5100_CR_OFFSET)) ; // loop until socket starts the send (blocks!!)
return W5100_OK;
}
void DisconnectSocket(unsigned char sock)
{
unsigned int sockaddr;
if (sock > W5100_NUM_SOCKETS)
return; // if illegal socket number, ignore request
sockaddr = W5100_SKT_BASE(sock); // calc base addr for this socket
W51_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_DISCON); // disconnect the socket
while (W51_read(sockaddr + W5100_CR_OFFSET)) ; // loop until socket is closed (blocks!!)
}
unsigned char Listen(unsigned char sock)
{
unsigned char retval;
unsigned int sockaddr;
retval = W5100_FAIL; // assume this fails
if (sock > W5100_NUM_SOCKETS)
return retval; // if illegal socket number, ignore request
sockaddr = W5100_SKT_BASE(sock); // calc base addr for this socket
if (W51_read(sockaddr + W5100_SR_OFFSET) == W5100_SKT_SR_INIT) // if socket is in initialized state...
{
W51_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_LISTEN); // put socket in listen state
while (W51_read(sockaddr + W5100_CR_OFFSET)) ; // block until command is accepted
if (W51_read(sockaddr + W5100_SR_OFFSET) == W5100_SKT_SR_LISTEN)
retval = W5100_OK; // if socket state changed, show success
else
CloseSocket(sock); // not in listen mode, close and show an error occurred
}
return retval;
}
unsigned int Receive(unsigned char sock, unsigned char *buf,
unsigned int buflen)
{
unsigned int ptr;
unsigned int offaddr;
unsigned int realaddr;
unsigned int sockaddr;
if (buflen == 0 || sock >= W5100_NUM_SOCKETS)
return W5100_FAIL; // ignore illegal conditions
if (buflen > (MAX_BUF - 2))
buflen = MAX_BUF - 2; // requests that exceed the max are truncated
sockaddr = W5100_SKT_BASE(sock); // calc base addr for this socket
ptr = W51_read(sockaddr + W5100_RX_RD_OFFSET); // get the RX read pointer (MSB)
offaddr = (((ptr & 0x00FF) << 8) + W51_read(sockaddr + W5100_RX_RD_OFFSET + 1)); // get LSB and calc offset addr
while (buflen) {
buflen--;
realaddr =
(W5100_RXBUFADDR + (0x0800 * sock)) +
(offaddr & W5100_RX_BUF_MASK);
*buf = W51_read(realaddr);
offaddr++;
buf++;
}
*buf = '\0'; // buffer read is complete, terminate the str
// Increase the S0_RX_RD value, so it point to the next receive
W51_write(sockaddr + W5100_RX_RD_OFFSET, (offaddr & 0xFF00) >> 8); // update RX read offset (MSB)
W51_write(sockaddr + W5100_RX_RD_OFFSET + 1, (offaddr & 0x00FF)); // update LSB
// Now Send the RECV command
W51_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_RECV); // issue the receive command
_delay_us(5); // wait for receive to start
return W5100_OK;
}
void nicGetMacAddress(uint8_t* macaddr)
{
*macaddr++ = W51_read(W5100_SHAR);
*macaddr++ = W51_read(W5100_SHAR+1);
*macaddr++ = W51_read(W5100_SHAR+2);
*macaddr++ = W51_read(W5100_SHAR+3);
*macaddr++ = W51_read(W5100_SHAR+4);
*macaddr++ = W51_read(W5100_SHAR+5);
}
int main(void)
{
unsigned int sockaddr;
unsigned char mysocket;
unsigned int rsize;
/* Initialize the UART for ATmega168 96008N1 */
uart_init();
stdout = &uart_stdout; //Required for printf init
mysocket = 0; // magic number! declare the socket number we will us
sockaddr = W5100_SKT_BASE(mysocket); // calc address of W5100 register set for this socket
puts("AVR Ethernet\r\n");
/*
* Initialize the ATmega168 SPI subsystem
*/
CS_PORT |= (1 << CS_BIT); // pull CS pin high
CS_DDR |= (1 << CS_BIT); // now make it an output
SPI_PORT = SPI_PORT | (1 << PORTB2); // make sure SS is high
SPI_DDR = (1 << PORTB3) | (1 << PORTB5) | (1 << PORTB2); // set MOSI, SCK and SS as output, others as input
SPCR = (1 << SPE) | (1 << MSTR); // enable SPI, master mode 0
SPSR |= (1 << SPI2X); // set the clock rate fck/2
/*
* Load up the callback block, then initialize the Wiznet W5100
*/
my_callbacks._select = &my_select; // callback for selecting the W5100
my_callbacks._xchg = &my_xchg; // callback for exchanging data
my_callbacks._deselect = &my_deselect; // callback for deselecting the W5100
my_callbacks._reset = &my_reset; // callback for hardware-reset of the W5100
W51_register(&my_callbacks); // register our target-specific W5100 routines with the W5100 library
W51_init(); // now initialize the W5100
/*
* Configure the W5100 device to handle PING requests.
* This requires configuring the chip, not a specific socket.
*/
W51_config(&my_cfg); // config the W5100 (MAC, TCP address, subnet, etc
puts("Debug: AVR Ethernet after W5100 config\r\n");
/*
* The main loop. Control stays in this loop forever, processing any received packets
* and sending any requested data.
*/
while (1) {
switch (W51_read(sockaddr + W5100_SR_OFFSET)) // based on current status of socket...
{
case W5100_SKT_SR_CLOSED: // if socket is closed...
if (OpenSocket(mysocket, W5100_SKT_MR_TCP, HTTP_PORT) == mysocket) // if successful opening a socket...
{
Listen(mysocket);
_delay_ms(1);
}
break;
case W5100_SKT_SR_ESTABLISHED: // if socket connection is established...
rsize = ReceivedSize(mysocket); // find out how many bytes
if (rsize > 0) {
if (Receive(mysocket, buf, rsize) != W5100_OK)
break; // if we had problems, all done
/*
* Add code here to process the payload from the packet.
*
* For now, we just ignore the payload and send a canned HTML page so the client at least
* knows we are alive.
*/
strcpy_P((char *)buf,PSTR("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\nPragma: no-cache\r\n\r\n"));
strcat_P((char *)buf,PSTR("<html>\r\n<body>\r\n"));
strcat_P((char *)buf,PSTR("<title>Title</title>\r\n"));
strcat_P((char *)buf,PSTR("<p>Hello world</p>\r\n"));
strcat_P((char *)buf,PSTR("</body>\r\n</html>\r\n"));
if (Send(mysocket, buf, strlen((char *)buf)) == W5100_FAIL) break; // just throw out the packet for now
DisconnectSocket(mysocket);
} else // no data yet...
{
_delay_us(10);
}
break;
case W5100_SKT_SR_FIN_WAIT:
case W5100_SKT_SR_CLOSING:
case W5100_SKT_SR_TIME_WAIT:
case W5100_SKT_SR_CLOSE_WAIT:
case W5100_SKT_SR_LAST_ACK:
CloseSocket(mysocket);
break;
}
}
return 0;
}
