Problem is solved. Timer Interval is working pretty well. Problem is my messurement.
I use the interrupt timer as an periodic irq. My problem is, that the number of interrupt differ from run to run(Run takes always 10s. Its also a very huge difference(From 80k to 100k interrupts/10s -> 8k to 10k irqs/s
Where is the bug?
Here my config:
IOWR(TIMER_BASE,1,(1<<3) | (1 << 1) |(1 << 0) );//Stop Timer, IRQ enable, counter continue when getting 0
IOWR(TIMER_BASE,0,0); // Clear TO Bit(Reaching 0)
IOWR(TIMER_BASE,2,(alt_u16)(10000-1)); // Interrupt Time will rise every 100µs
IOWR(TIMER_BASE,3,(alt_u16)( (10000-1) >> 16 ));
alt_irq_register(1, NULL, timer_interrupt); //Register Interrupt
IOWR(TIMER_BASE,1,(1<<2) | (1 << 1) | (1 << 0) );//Start Timer, IRQ enable, Continuous enable
I got a main loop like this
while(10s)
{
}
ISR:
static void timer_interrupt(void* context, alt_u32 id){
IOWR(TIMER_BASE,0,0); //Clear TO(timeout) bit)
interrupts++;
...
}
Prototypes:
...
static void timer_interrupt(void* context, alt_u32 id);
int alt_irq_register (alt_u32 id,void* context,void (*isr)(void*, alt_u32));
...
Interval Timer clock is running at 100Mhz
