Echelon I/O Model Reference for Smart Transceivers and Neu Manuel d'utilisateur télécharger pdf (Page 83)

I/O Model Reference 73

Example

The following example shows how to use the io_in_ready and io_out_ready

events, in conjunction with the io_out_request( ) function, to handle parallel I/O

processing.

#define DATA_SIZE 255

struct parallel_io_interface {

unsigned int length; // length of data field

unsigned int data [DATA_SIZE]; // data field

} piofc;

IO_0 parallel slave slaveBus;

// ready to input data

when (io_in_ready(slaveBus)) {

piofc.length = DATA_SIZE; // number of bytes to read

io_in(slaveBus, &piofc); // get 10 bytes of incoming data

}

// ready to output data

when (io_out_ready(slaveBus)) {

piofc.length = 10; // number of bytes to write

io_out(slaveBus, &piofc); // output 10 bytes from buffer

}

// user defined event

when (...) {

io_out_request(slaveBus); // post the write request

}

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Echelon I/O Model Reference for Smart Transceivers and Neu Manuel d'utilisateur Page 83