Echelon FTXL - Manual (Page 99)

FTXL User’s Guide 87
This example extends the previous example and shows how your application can
be notified of an update to either network variable. To receive notification of a
network variable update, modify the LonNvUpdateOccurred() callback function.
In FtxlHandlers.c:
extern void myController(void);
void LonNvUpdateCompleted(unsigned index, const LonBool
success) {
switch (index) {
case LonNvIndexNviAmpere: /* fall through */
case LonNvIndexNviVolt:
myController();
break;
default:
/* handle other NV updates (if any) */
}
}
In your application source file:
#include "FtxlDev.h"
void myController(void) {
// nvoWatt = nviAmpere * nviVolt;
LON_SET_UNSIGNED_WORD(nvoWatt,
LON_GET_UNSIGNED_WORD(nviAmpere)
* LON_GET_UNSIGNED_WORD(nviVolt));
if (LonPropagateNv(LonNvIndexNvoWatt) != LonApiNoError)
{
// handle propagation error here
...
}
}
This modification calls the myController() function defined in the example in the
previous section,
Sending a Network Variable Update , on page 83. Because
network variable types are defined as type LonWord, this example uses the
LON_GET_UNSIGNED_WORD macros to get the nviAmpere and nviVolt
network variable values, and LON_SET_UNSIGNED_WORD to set the value for
the nvoWatt network variable.
Example 2:
This example adds a configuration network variable to Example 1. A SCPTgain
configuration property is added to the device interface in the model file:
network input SNVT_amp nviAmpere;
network input SNVT_volt nviVolt;
network output SNVT_power nvoWatt;
network input cp SCPTgain nciGain;
fblock UFPTpowerConverter {
nvoWatt implements nvoPower;
nviAmpere implements nviCurrent;
nviVolt implements nviVoltage;
} powerConverter fb_properties {