> Hi,
>
> I am new to the Nios II core. I have built a simple system with a timer
> which is set as periodically timer. I have registered an interrupt
> service routine:
>
> alt_irq_disable(TIMER_0_IRQ);
> res = alt_irq_register(TIMER_0_IRQ, NULL, timer_isr);
>
> With this code I still come in my installed ISR. So registering is also
> enable the interrupt. Is that correct, is there a way to register an ISR
> and leave the interrupt disabled (until you decide to enable it manually)?
Normally, you'll use the generated alt_sys_init() to set up the timers
in alt_main(). This wants to happen after the call to alt_irq_init(ALT_IRQ_BASE).
Take a look at the macros in alt_sys_init() to see the underlying process.
>
> Another question: where can I find a list with available routines for
> the peripheral. For instance, I saw in an example the call
> IOWR_ALTERA_AVALON_PIO_DATA to write to my io-pins. But where can I find
> a complete list. It not in the software developer's handbook.
Take a look in the components directory. For example, for pios, take
a look at components/altera_avalon_pio/inc/altera_avalon_pio_regs.h.
Mark
Reply by Frank van Eijkelenburg●October 5, 20062006-10-05
Hi,
I am new to the Nios II core. I have built a simple system with a timer which is
set as periodically timer. I have registered an interrupt service routine:
alt_irq_disable(TIMER_0_IRQ);
res = alt_irq_register(TIMER_0_IRQ, NULL, timer_isr);
With this code I still come in my installed ISR. So registering is also enable
the interrupt. Is that correct, is there a way to register an ISR and leave the
interrupt disabled (until you decide to enable it manually)?
Another question: where can I find a list with available routines for the
peripheral. For instance, I saw in an example the call
IOWR_ALTERA_AVALON_PIO_DATA to write to my io-pins. But where can I find a
complete list. It not in the software developer's handbook.
best regards,
Frank