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How DSR is executed in interrupt ?
- From: "ariga masahiro" <ariga at link-lab dot co dot jp>
- To: <ecos-discuss at ecos dot sourceware dot org>
- Date: Mon, 10 Sep 2007 17:21:21 +0900
- Subject: [ECOS] How DSR is executed in interrupt ?
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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