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D Programming/RTAI/User Space Interrupts
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RTAI has user space interrupts called RTAI USI.
Let Linux assign a IRQ number for you PCI device
But before one can use them, the hardware interrupt has to be mapped to interrupt in Linux. Therefore it is necessary to build a kernel module for the pci device, that registers the interrupt. With this action, the device gets a new interrupt number, which can be used in the usi.
Writing an interrupt handler
Create a realtime thread:
In the thread make a loop, looking like that:
public void run(){
const int irqNum = 5;
rt_request_irq_task( irqNum, null, RT_IRQ_TASK, 1 );
rt_startup_irq( irqNum );
rt_enable_irq( irqNum );
while( true ){
int overrun = rt_irq_wait( irqNum );
if( overrun == RT_IRQ_TASK_ERR )
break;
// if program should quit, break here
// Do the irq handling
rt_ack_irq();
}
rt_release_irq_task( irqNum );
}