ETH in – Ethernet input mailbox

The Ethernet input mailbox block allows receiving 32-bit values via Ethernet using the UDP protocol.

It reads 4 bytes of data (32-bit) received via UDP/IP on the specified port and applies it to the output port of the block. The data can be interpreted as an int32, an uint32, or a float. The ETH input mailbox block features a second output that indicates that new data have been received. The value on the output data port will remain unchanged until new data are received.

Simulink block

Signal specification

• The data output signal returns 32 bits of data received via UDP. The output data type is configured by the Signal decoding format parameter.
• The second signal is the data valid output. It is set to 1 each time new data are available.

Parameters

• Ethernet port number: sets the port number on which data will be received.
• Signal decoding format: defines the type of the data output (int32, uint32, or float32).
• Byte order: defines the byte order in which the data will be read. (little-endian or big-endian)
• Initial value: sets the initial value of the data output before any data are received. The value is interpreted as a uint64.

PLECS block

Signal specification

• The data output signal returns 32 bits of data received via UDP. The output data type is configured by Signal decoding format parameter.
• The second signal is the data valid output. It is set to 1 each time new data are available.

Parameters

• Ethernet port number: sets the port number on which data will be received.
• Signal decoding format: defines the type of the data output (int32, uint32, or float32).
• Byte order: defines the byte order in which the data will be read. (little-endian or big-endian)
• Initial value: sets the initial value of the data output before any data are received. The value is interpreted as a uint64.

C++ functions

bool Eth_ConfigureInputMailbox(unsigned int mailboxId, unsigned int port, tEndianness endianness = LITTLE_ENDIAN);Code language: C++ (cpp)

void Eth_ConfigureInputMailboxInitialValue(unsigned int mailboxId, unsigned int initialValue);Code language: C++ (cpp)

void Eth_ConfigureInputMailboxInitialValue(unsigned int mailboxId, int initialValue);Code language: C++ (cpp)

void Eth_ConfigureInputMailboxInitialValue(unsigned int mailboxId, float initialValue);Code language: C++ (cpp)

int Eth_Read(unsigned int mailboxId, unsigned int &data);Code language: C++ (cpp)

int Eth_Read(unsigned int mailboxId, int &data);
Code language: C++ (cpp)

int Eth_Read(unsigned int mailboxId, float &data);
Code language: C++ (cpp)