Echelon ISI Manuale Utente Scaricare il pdf (Pagina 78)

ISI Programmer’s Guide 76

deleted devices, monitor the time of the last update for each entry in the table

and detect devices that have not recently sent a DRUM.

XAMPLE 1

The following example maintains a device table, adding new devices when

discovered, updating subnet and node IDs when they change, and deleting

stale devices.

#include <isi.h>

#include <mem.h>

#define MAX_DEVICES 16

#define MAX_CREDITS 5

#pragma num_alias_table_entries 6

unsigned deviceCount;

// Struct to hold device information

typedef struct {

unsigned credits;

unsigned subnetId;

unsigned nodeId;

unsigned neuronId[NEURON_ID_LEN];

} Device;

Device devices[MAX_DEVICES];

when (reset) {

deviceCount = 0; // Not required since global RAM is zeroed

scaled_delay(31745UL); // 800ms delay

IsiStartS(isiFlagNone);

}

void MaintainDevices(const IsiDrum* pDrum) {

unsigned i;

// Iterate through the device list and see if the Neuron ID

// of the stored device matches that of the new device; if it

// does, then update the related details

for (i = 0; i < deviceCount; i++) {

if (memcmp(Devices[i].neuronId, pDrum->NeuronId,

NEURON_ID_LEN) == 0) {

devices[i].credits = MAX_CREDITS;

devices[i].subnetId = pDrum->SubnetId;

devices[i].nodeId = pDrum->NodeId;

break;

}

// If i is equal to the device count, then the device was not

// found, so add it to the device table if possible

if (i == deviceCount && deviceCount < MAX_DEVICES) {

memcpy(devices[i].neuronId, pDrum->NeuronId,

NEURON_ID_LEN);

deviceCount++;

devices[i].credits = MAX_CREDITS;

devices[i].subnetId = pDrum->SubnetId;

devices[i].nodeId = pDrum->NodeId;

}

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