/**
* --------------------------------------------------------
* GET GPIO PIN INDEX
* --------------------------------------------------------
*/
int isPinValid(int pin)
{
// validate lower bounds
if(pin < 0)
return 0;
// validate upper bounds
if(pin > MAX_GPIO_PINS)
return 0;
// if the pin index is zero or greater, then the pin is valid
// (will return 0 for invalid pin)
if(getEdgePin(pin) >= 0)
return 1;
else
return 0;
}
}
/*
* --------------------------------------------------------
* ENABLE PIN STATE CHANGES (for callback notifications)
* --------------------------------------------------------
* Class: com_pi4j_wiringpi_GpioInterrupt
* Method: enablePinStateChangeCallback
* Signature: (I)I
*/
JNIEXPORT jint JNICALL Java_com_pi4j_wiringpi_GpioInterrupt_enablePinStateChangeCallback
(JNIEnv *env, jclass class, jint pin)
{
// get the index position for the requested pin number
int index = pin;
int edgePin = getEdgePin(index);
// ensure that the requested pin index is valid
if(index >= 0 && edgePin >= 0)
{
// only start this thread monitor if it has not already been started
if(monitor_data_array[index].running <= 0)
{
// configure the monitor instance data
monitor_data_array[index].thread_id = index;
monitor_data_array[index].pin = pin;
monitor_data_array[index].edgePin = edgePin;
// create monitoring instance thread
pthread_create(&threads[index], NULL, (void*) monitorPinInterrupt, (void *) &monitor_data_array[index]);
