Abl-electronic PIC Microcontrollers PIC16 Instrukcja Użytkownika Pobierz pdf (Strona 190)

mikroC

- C Compiler for Microchip PIC microcontrollers

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Prototype

void Eth_Load_Tcp_Header(void);

Description Loads various TCP Header data into PIC’s Ethernet variables.

Requires This function must be called in a proper sequence, i.e. immediately after retrieving the

source and destination port (socket) of the TCP message.

Example

// retrieve 'source port'

tcp_source_port = Eth_Inport(NIC_DATA) << 8;

tcp_source_port |= Eth_Inport(NIC_DATA);

// retrieve 'destination port'

tcp_dest_port = Eth_Inport(NIC_DATA) << 8;

tcp_dest_port |= Eth_Inport(NIC_DATA);

// We only respond to port 80 (HTML requests)

if (tcp_dest_port == 80u) {

Eth_Load_Tcp_Header();

// retrieve TCP Header data (most of it)

//...

}

Eth_Load_Tcp_Header

Prototype

void Eth_Send_Udp(char *msg);

Description Sends the prepared UDP message (msg), of up to 16 bytes (characters).

Unlike ICMP and TCP, the UDP packets are generally not generated as a response to the

client request. UDP provides no guarantees for message delivery and sender retains no

state on UDP messages once sent onto the network. This is why UDP packets are simply

sent, instead of being a response to someone’s request.

Requires As specified for the entire library. Also, the message to be sent must be formatted as a

null-terminated string. The message length, including the trailing “0”, must not exceed

16 characters.

Example

Eth_Send_Udp(udp_tx_message);

Eth_Send_Udp

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Abl-electronic PIC Microcontrollers PIC16 Instrukcja Użytkownika Strona 190