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 (w5100_read(sockaddr + W5100_SR_OFFSET) == W5100_SKT_SR_CLOSED) // Make sure we close the socket first
{
CloseSocket(sock);
}
w5100_write(sockaddr + W5100_MR_OFFSET, eth_protocol); // set protocol for this socket
w5100_write(sockaddr + W5100_PORT_OFFSET, ((tcp_port & 0xFF00) >> 8)); // set port for this socket (MSB)
w5100_write(sockaddr + W5100_PORT_OFFSET + 1, (tcp_port & 0x00FF)); // set port for this socket (LSB)
w5100_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_OPEN); // open the socket
while (w5100_read(sockaddr + W5100_CR_OFFSET)); // loop until device reports socket is open (blocks!!)
char temp = w5100_read(sockaddr + W5100_SR_OFFSET);
if ( temp == W5100_SKT_SR_INIT)
{
retval = sock;
}// if success, return socket number
else
{
CloseSocket(sock);
}// if failed, close socket immediately
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 = w5100_read(sockaddr + W5100_RX_RD_OFFSET); // get the RX read pointer (MSB)
offaddr = (((ptr & 0x00FF) << 8) + w5100_read(sockaddr + W5100_RX_RD_OFFSET + 1)); // get LSB and calc offset addr
while (buflen) {
buflen--;
realaddr = W5100_RXBUFADDR + (offaddr & W5100_RX_BUF_MASK);
*buf = w5100_read(realaddr);
offaddr++;
buf++;
}
*buf = '\0'; // buffer read is complete, terminate the string
// Increase the S0_RX_RD value, so it point to the next receive
w5100_write(sockaddr + W5100_RX_RD_OFFSET, (offaddr & 0xFF00) >> 8); // update RX read offset (MSB)
w5100_write(sockaddr + W5100_RX_RD_OFFSET + 1, (offaddr & 0x00FF)); // update LSB
// Now Send the RECV command
w5100_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_RECV); // issue the receive command
__delay_us(5); // wait for receive to start
return W5100_OK;
}
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 = w5100_read(sockaddr + W5100_RX_RSR_OFFSET) & 0xff;
val = (val << 8) + w5100_read(sockaddr + W5100_RX_RSR_OFFSET + 1);
return val;
}
static void w5100_read_data( uint8_t s, volatile uint8_t *src, volatile uint8_t *dst, uint16_t len ) {
uint16_t size;
uint16_t src_mask;
uint16_t src_ptr;
src_mask = (uint16_t)src & RMASK;
src_ptr = RBASE[CMD_SOCKET] + src_mask;
if( (src_mask + len) > RSIZE ) {
size = RSIZE - src_mask;
w5100_read(src_ptr, (uint8_t *)dst, size);
dst += size;
w5100_read(RBASE[CMD_SOCKET], (uint8_t *) dst, len - size);
} else {
w5100_read(src_ptr, (uint8_t *) dst, len);
}
}
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 (w5100_read(sockaddr + W5100_SR_OFFSET) == W5100_SKT_SR_INIT) // if socket is in initialized state...
{
w5100_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_LISTEN); // put socket in listen state
while (w5100_read(sockaddr + W5100_CR_OFFSET)); // block until command is accepted
if (w5100_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;
}
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
w5100_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_DISCON); // disconnect the socket
while (w5100_read(sockaddr + W5100_CR_OFFSET)); // loop until socket is closed (blocks!!)
}
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 = w5100_read(sockaddr + W5100_TX_FSR_OFFSET); // make sure the TX free-size reg is available
txsize = (((txsize & 0x00FF) << 8) + w5100_read(sockaddr + W5100_TX_FSR_OFFSET + 1));
timeout = 0;
while (txsize < buflen) {
__delay_ms(1);
txsize = w5100_read(sockaddr + W5100_TX_FSR_OFFSET); // make sure the TX free-size reg is available
txsize = (((txsize & 0x00FF) << 8) + w5100_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 = w5100_read(sockaddr + W5100_TX_WR_OFFSET);
offaddr = (((ptr & 0x00FF) << 8) + w5100_read(sockaddr + W5100_TX_WR_OFFSET + 1));
while (buflen) {
buflen--;
realaddr = W5100_TXBUFADDR + (offaddr & W5100_TX_BUF_MASK); // calc W5100 physical buffer addr for this socket
w5100_write(realaddr, *buf); // send a byte of application data to TX buffer
offaddr++; // next TX buffer addr
buf++; // next input buffer addr
}
w5100_write(sockaddr + W5100_TX_WR_OFFSET, (offaddr & 0xFF00) >> 8); // send MSB of new write-pointer addr
w5100_write(sockaddr + W5100_TX_WR_OFFSET + 1, (offaddr & 0x00FF)); // send LSB
w5100_write(sockaddr + W5100_CR_OFFSET, W5100_SKT_CR_SEND); // start the send on its way
while (w5100_read(sockaddr + W5100_CR_OFFSET)); // loop until socket starts the send (blocks!!)
return W5100_OK;
}
int testserver(void) {
unsigned int sockaddr;
unsigned char mysocket;
unsigned int rsize;
mysocket = 0; // magic number! declare the socket number we will use (0-3)
sockaddr = 0x400;//W5100_SKT_BASE(mysocket); // calc address of W5100 register set for this socket
/*
* The main loop. Control stays in this loop forever, processing any received packets
* and sending any requested data.
*/
while (1) {
LATAbits.LATA0 ^= 1;
int x = w5100_read(sockaddr + W5100_SR_OFFSET);
switch (x) // based on current status of socket...
{
case W5100_SKT_SR_CLOSED: // if socket is closed...
LATBbits.LATB8 = 0;
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...
LATBbits.LATB8 = 1;
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((char *) buf, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\nPragma: no-cache\r\n\r\n");
strcat((char *) buf, "<html>\r\n<body>\r\n");
strcat((char *) buf, "<title>Phil's W5100 web server (ATmega644p)</title>\r\n");
strcat((char *) buf, "<h2>Phil's ATmega644p web server using Wiznet W5100 chip</h2>\r\n");
strcat((char *) buf, "<br /><hr>\r\n");
if (Send(mysocket, buf, strlen((char *) buf)) == W5100_FAIL) break; // just throw out the packet for now
strcpy((char *) buf, "This is part 2 of the page.");
strcat((char *) buf, "</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;
}
