Casio EG-800U - Cassiopeia - Win CE 3.0 150 MHz Specifications download pdf (Page 22)

SLAA137A

22 MSP430 Internet Connectivity

void TCPClose(void)

Use this API function to close an open connection. Before disconnecting, the stack ensures that

a packet that still resides in the output buffer is transmitted and acknowledged properly. After

closing, the application may reconfigure IP addresses, reassign port numbers, and open a new

connection.

void TCPReleaseRxBuffer(void)

After reading out the receive buffer, calling this function tells the stack that the buffer contents is

not needed anymore and may be overwritten by new incoming TCP data. This function also

clears the SOCK_TX_BUF_RELEASED flag used to indicate the presence of new data.

void TCPTransmitTxBuffer(void)

By using this function, an application can send data over an already opened connection. First,

the application has to check if it may write data to the transmit buffer. This is done by testing the

flag SOCK_TX_BUF_RELEASED of the SocketStatus register. If this flag is set, the application

may write a maximum of MAX_TCP_TX_DATA_SIZE bytes to the transmit buffer, starting at

address TCP_TX_BUF (points to the data section of the TxFrame1 buffer). Afterwards, the byte

count must be written to TCPTxDataCount register. Finally, calling TCPTransmitTxBuffer() leads

to the transmission of the data (Figure 10).

TX_BUF_RELEASED?

Yes

Copy Data to Transmit to TCP_TX_BUF

TCPTxDataCount = Number of Bytes to Send

TCPTransmitTxBuffer()

Figure 10. Transmitting of Data

4.3.2 Flags

The API status flags are stored in the global 8-bit variable SocketStatus. This register can only

be read out. The bit positions of the described flags are shown in Figure 11.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 31 32

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Casio EG-800U - Cassiopeia - Win CE 3.0 150 MHz Specifications Page 22