[ECOS] How DSR is executed in interrupt ?

["ariga masahiro" <ariga@link-lab.co.jp>]

Hi,

Please help me next question ?

I am trying to run LAN91CXX drive on interrupt,
and it became to enter ISR routine when IRQ3 Line is asserted.

But it looks like IRQ3 Line is ON-State forever and never become OFF-State.
ISR is repetedly entered but never enter into DSR routine.

ISR/DSR are setted like this in smsc_lan91cxx_init(),
    // Initialize environment, setup interrupt handler
    cyg_drv_interrupt_create(cpd->interrupt,
                            8, // Priority - what goes here?
                             (cyg_addrword_t)sc, //  Data item passed to 
interrupt handler
                             (cyg_ISR_t *)lan91cxx_isr,
                             (cyg_DSR_t *)eth_drv_dsr, // The logical driver 
DSR
                             &lan91cxx_interrupt_handle,
                             &lan91cxx_interrupt);
    cyg_drv_interrupt_attach(lan91cxx_interrupt_handle);

ISR is like below,
static int
lan91cxx_isr(cyg_vector_t vector, cyg_addrword_t data
             /* , HAL_SavedRegisters *regs */ )
{
    struct eth_drv_sc *sc = (struct eth_drv_sc *)data;
    struct lan91cxx_priv_data *cpd =
        (struct lan91cxx_priv_data *)sc->driver_private;

    DEBUG_FUNCTION();

    INCR_STAT( interrupts );

    cyg_drv_interrupt_mask(cpd->interrupt);
    cyg_drv_interrupt_acknowledge(cpd->interrupt);
    return (CYG_ISR_HANDLED|CYG_ISR_CALL_DSR);  // Run the DSR
}

According Anthony J. Massa's Book,as far as ISR returns CYG_ISR_CALL_DSR
DSR is executed.

As DSR,since I build using "net" Template,
I think /packages/io/eth/v2_0/src/net/eth_drv.c file's
eth_drv_dsr function is used.
I tested its entering by inserting diag_printf but never entered in it.

DSR is below,
eth_drv_dsr(cyg_vector_t vector,
            cyg_ucount32 count,
            cyg_addrword_t data)
{
    struct eth_drv_sc *sc = (struct eth_drv_sc *)data;

    //20070907
    diag_printf("DSR\n");

#ifdef CYGDBG_USE_ASSERTS
    // then check that this really is a "sc"
    {
        cyg_netdevtab_entry_t *t;
        for (t = &__NETDEVTAB__[0]; t != &__NETDEVTAB_END__; t++)
            if ( ((struct eth_drv_sc *)t->device_instance) == sc )
                break; // found it
        CYG_ASSERT( t != &__NETDEVTAB_END__, "eth_drv_dsr: Failed to find sc 
in NETDEVTAB" );
    }
#endif // Checking code

    sc->state |= ETH_DRV_NEEDS_DELIVERY;

    ecos_synch_eth_drv_dsr(); // [request] run delivery function for this 
dev
}

Also I assured interrupt_end is executed in VSR after subroutine call of 
ISR.

My question is that are there any way DSR is called other than above route ?

Especially I doubt about delivery operation althoug I have not fathamed its 
operation.
Is delivery operation is connected to interrupt ?

Please enlighten me.

Masahiro Ariga


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