Echelon Mini EVK - Manual (Page 62)

// Repeat every 50 milliseconds
mtimer repeating scanTimer = 50;
// Read the buttons when the timer expires
when(timer_expires(scanTimer)) {
boolean button;
static boolean lastButton;
button = GetButton();
if (button != lastButton) {
lastButton = button;
nvoSwitch.value = button ? 200U : 0;
nvoSwitch.state = button ? 1 : 0;
}
}
Analog Sensor Example
The following example application adds an Open Loop Sensor functional block to
the previous analog sensor example. The network variable output is changed to
be a member of the functional block. The functional block code is highlighted in
bold. A network tool such as the LonMaker Integration Tool is required to test
this application.
#pragma enable_io_pullups
#pragma enable_sd_nv_names
#pragma num_alias_table_entries 2
#pragma run_unconfigured
// Define the device interface
network output SNVT_temp_p nvoTemperature;
fblock SFPTopenLoopSensor {
nvoTemperature implements nvoValue;
} fbSwitch external_name("Temperature");
// Configure the I/O pins
IO_7 touch ioThermometer;
#define DS18S20_SKIP_ROM 0xCCu
#define DS18S20_CONVERT 0x44u
#define DS18S20_READ 0xBEu
// Get a temperature reading from the Touch temperature sensor
SNVT_temp_p GetTemperature(void) {
union {
SNVT_temp_p snvtTempP;
unsigned Bytes[2];
} CurrentTemperature;
CurrentTemperature.snvtTempP = 32767l;
if (touch_reset(ioThermometer)) {
(void) touch_byte(ioThermometer, DS18S20_SKIP_ROM);
(void) touch_byte(ioThermometer, DS18S20_READ);
CurrentTemperature.Bytes[1]
= touch_byte(ioThermometer, 0xFFu);
CurrentTemperature.Bytes[0]
= touch_byte(ioThermometer, 0xFFu);
if (touch_reset(ioThermometer)) {
// Scale the raw reading
56 Mini EVK User’s Guide