Echelon Neuron C - Manual (Page 26)

6 Predefined Events
when (io_out_ready(io_bus))
{
io_out(io_bus, &data);
}
io_update_occurs Event
The io_update_occurs event evaluates to TRUE when the input object specified
by
io-object-name has an updated value. The io_update_occurs event applies only
to timer/counter input object types listed in Table 3.
Table 3. Timer/Counter Objects for the io_update_occurs Event
I/O Object io_update_occurs evaluates to TRUE after:
dualslope The A/D conversion is complete
ontime The edge is detected defining the end of a period
period The edge is detected defining the end of a period
pulsecount Every 0.8388608 seconds
quadrature The encoder position changes
An input object may have an updated value that is actually the same as its
previous value. To detect changes in value, use the io_changes event. A given
I/O object cannot be included in when clauses with both io_update_occurs and
io_changes events.
A task can access the updated value for the I/O object through the input_value
keyword. The input_value type is always a signed long, but may be cast to
another type as necessary.
Syntax
io_update_occurs ( io-object-name )
io-object-name The I/O object name (see the I/O Model Reference ).
Example
#include
ontime_t therm_value;
// 'ontime_t' defined in io_types.h
IO_7 input ontime io_thermistor;
when (io_update_occurs(io_thermistor))
{
therm_value = (ontime_t)input_value;
}