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FW: DAI driver and I2S interrupt on edb7xxx
- To: <ecos-discuss at sourceware dot cygnus dot com>
- Subject: [ECOS] FW: [ECOS] DAI driver and I2S interrupt on edb7xxx
- From: "Robert Cragie" <rcc at jennic dot com>
- Date: Wed, 18 Jul 2001 16:31:05 +0100
On behalf of Franck Mamalet...
-----Original Message-----
From: ecos-discuss-owner@sources.redhat.com
[mailto:ecos-discuss-owner@sources.redhat.com]On Behalf Of Franck MAMALET
FT-R&D DIH/OCF
Sent: 18 July 2001 14:51
To: ecos-discuss@sourceware.cygnus.com
Subject: [ECOS] DAI driver and I2S interrupt on edb7xxx
Hi,
I'm trying to install a driver for DAI codec on the edb7xxx.
I had a look to hal/arm/edb7xxx/current/misc/i2s_audio... to devellop a
i2s_ISR and i2s_DSR and then create and attach them to
CYGNUM_HAL_INTERRUPT_I2SINT.
Looking at eCos interrupt handling I found something weird: in
hal_IRQ_handler(hal/arm/edb7xxx/current/src/edb7xxx_misc.c), eCos scans all
interrupts to find the vector number of the first interrupt to handle:
while (map->first_int)
stat = *(volatile cyg_uint32 *)map->stat_reg & *(volatile cyg_uint32
*)map->mask_reg;
for (vector = map->first_int; vector <= map->last_int; vector++)
if (stat & hal_interrupt_bitmap[vector]) return vector;
}
map++; // Next interrupt status register
}
But I2S interrupt vector number is 22 and is the last one, so it will be
handled after all pending interrupts (even some IRQs)
I think it is not a good idea for a FIQ, and actually it doesn't work. I
had to change hal_interrupt_status_regmap table to fix it:
"./arm/edb7xxx/current/src/edb7xxx_misc.c" line 284
static struct regmap
int first_int, last_int;
cyg_uint32 stat_reg, mask_reg;
} hal_interrupt_status_regmap[] =
{ CYGNUM_HAL_INTERRUPT_EXTFIQ, CYGNUM_HAL_INTERRUPT_MCINT, INTSR1,
INTMR1},
#if defined(__EDB7211)
{ CYGNUM_HAL_INTERRUPT_MCPINT, CYGNUM_HAL_INTERRUPT_MCPINT, INTSR3,
INTMR3},
#endif
#if defined(__EDB7209)
{ CYGNUM_HAL_INTERRUPT_I2SINT, CYGNUM_HAL_INTERRUPT_I2SINT, INTSR3,
INTMR3},
#endif
{ CYGNUM_HAL_INTERRUPT_CSINT, CYGNUM_HAL_INTERRUPT_SSEOTI, INTSR1,
INTMR1},
{ CYGNUM_HAL_INTERRUPT_KBDINT, CYGNUM_HAL_INTERRUPT_URXINT2, INTSR2,
INTMR2},
{ 0, 0, 0}
};
Could you please tell me if my modification is OK (I mean safe) ? and if
the same kind of selection is applied for DSR handling? and where?
Thanks,
Best regards,
Franck.
--
& france telecom
Mamalet Franck
FTR&D DIH/OCF
Tél : 04 76 76 45 71 Fax : 04 76 90 34 43
franck.mamalet@rd.francetelecom.com