Translated from Johnny Yan,''WIZnet即将推出虚拟串口（Virtual Serial Port)''
Our chip provides six different network statues. Here are the six different LEDS:
1) LINKLED: Link LED / Active low in link state indicates a good status for 10/100M. It is always ON when the link is OK and it flashes while in a TX or RX state
3) FDXLED: Full duplex LED / Active low indicates the status of full-duplex mode.
4) COLLED: Collision LED / Active low indicates the presence of collision activity.
5) RXLED: Receive activity LED / Active low indicates the presence of receiving activity.
6) TXLED: Transmit Activity LED/ Active low indicates the presence of transmitting activity.
Generally the yellow and green LEDs in the RJ45 jack are connected to the Full Duplex LED signal, and the Link LED signal respectively. During receive and transfer, the LINK LED blinks. If you want to separate the LINK LED signal from the transfer and receive LED, the following circuit should be implemented.
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In part three of serial to Ethernet, we will go over the data receiving process from the Ethernet. Because we are not using any interrupt for Ethernet data, we are basically checking if there are any Ethernet data stored in the RX buffer. If there are data in the RX buffer, we will print out the data from the Ethernet. The first step is to check for the number of data inside the RX buffer by using the getSn_RX_RSR function. This function returns the number of bytes in the RX buffer. If this value is greater than 0, this means that you can use the recv function to get the data.
void lan_to_rs232()
{
uint16 xdata chk_length; // length checker
uint16 xdata rcv_length; // length of data received
uint16 xdata idx; // for loop index
chk_length = getSn_RX_RSR(0); // get length of data in lan receive buffer
if(chk_length > 0) // check if there is data in lan receive buffer
{
if(chk_length > MAX_BUF_SIZE) chk_length = MAX_BUF_SIZE;
//check if length of lan received buffer is more than LAN_RX_BUF
rcv_length = recv(0,LAN_RX_BUF,chk_length); //receive data
for(idx = 0; idx <>
#define MAX_BUF_SIZE 2048 // define maximum buffer size
uint8 xdata pDestaddr[4]; //xdata using external ram
uint16 xdata pPort; // destination port
uint8 xdata rcvLen; // length of data received
uint16 xdata length; // the length of data received
uint8 xdata RXdata[MAX_BUF_SIZE]; // RX data received
uint8 xdata TXData[MAX_BUF_SIZE]; // TX data send
uint16 xdata sentLen; // length of data sent
uint16 xdata TXSize; // size of string sent
Init_iMCU(); // Initialize iMCUW7100
Init_Network(); // Initialize Network Configuration
//Delay for link
wait_1ms(7000);
// 1. create socket for udp
if(socket(0, Sn_MR_UDP,5000, 0) == 1) // create socket with UDP port 5000
{
PutString("\r\n opened socket");
// 2. receive data
while(getSn_RX_RSR(0) == 0) ; // check if there is data in socket
PutString("\r\n got data");
rcvLen = getSn_RX_RSR(0);
if(rcvLen > MAX_BUF_SIZE) // check if data received is bigger than size of buffer string
rcvLen = MAX_BUF_SIZE; // assign max buffer size to the received length
PutString("\r\n RX data size is "); PutITOA(rcvLen); PutString(" Bytes.");
length = recvfrom(0, RXdata, rcvLen, pDestaddr, &pPort); // receive data
RXdata[length] = 0; // indicate the end of string
PutString("\r\n RX data : ");
PutString(RXdata); // print received data
// 3. trasnmit data
//set Dest. IP address & Port
pDestaddr[0]= 192;
pDestaddr[1]= 168;
pDestaddr[2]= 1;
pDestaddr[3]= 3;
pPort = 5000;
PutString("\r\n TX data size is ");PutITOA(TXSize);
sentLen = sendto(0, TXData, TXSize, pDestaddr, pPort); // transfer data
if (sentLen == TXSize)
PutString("\r\n success to transmit");
else
PutString("\r\n Failed to transmit");
}
else // if socket is fail
PutString("\r\n Failed to open socket");
