Echelon Neuron C - Manual (Page 125)

Neuron C Reference Guide 105
Example
IO_0 output bit b0;
IO_0 input byte byte0;
int read_byte;
void f(void)
{
io_set_direction(b0,
IO_DIR_OUT);
io_out(b0, 0);
io_set_direction(byte0); // Defaults to IO_DIR_IN
read_byte = io_in(byte0);
}
io_set_terminal_count( ) Built-in Function
The io_set_terminal_count( ) built-in function allows the application to change
the terminal count for the stretched triac I/O object at runtime. This function
allows a device to:
• Have a single application for both 50 Hz and 60 Hz power domains
• Operate at a non-standard power line frequency
• Provide higher-than-typical tolerances to changes in frequency
The application can determine the current values for frequency at runtime, and
use this function to adjust the triac on-time as needed.
See the
I/O Model Reference for more information about the stretched triac
model.
Syntax
void io_set_terminal_count ( io-object-name , terminal_count );
io-object-name The I/O object name that corresponds to io-object-name in
the I/O declaration. This built-in function is used only for
the stretchedtriac direct I/O object.
terminal_count A value from 0 to 193 for triac devices running with 50 Hz
AC power, or a value from 0 to 160 for triac devices
running with 60 Hz AC power. This value represents the
amount of stretching for the triac trigger pulse within the
half-cycle. Specify this value to calibrate the triac device.
Example
IO_0 output stretchedtriac sync (IO_5) frequency(60)
ioTriac;
when (...) {
io_out(ioTriac, 160); // full on
}
when (...) {
io_out(ioTriac, 80); // half on