Solved.
It was my fault, but the source in my opinion is a little misleading.
Since the USB interrupt autovector had been separated by the GPIF/FIFO one
(likely as a memory optimization during changeset 2452), it is not allowed
to use in hook_fgv the same vector_number as in hook_uv.
In fact FGV_MIN, defined as 0x80 in isr.h, is sequential in the unified
table USB+GPIF/FIFO to the last USB resource interrupt, but should be 0x0
when used to indicize the new _fifo_gpif_autovector at address 0x0080.
Maybe a little update to the firmware should be done, either updating
FGV_xxxx values in isr.h, or modifying the hook_fgv as follows:
/* begin */
void
hook_fgv (unsigned char vector_number, unsigned short addr)
{
bit t;
BYTE vector_idx;
// sanity checks
if (vector_number < FGV_MIN || vector_number > FGV_MAX)
return;
if ((vector_number & 0x3) != 0)
return;
vector_idx = vector_number - FGV_MIN;
t = EA;
EA = 0;
_fifo_gpif_autovector[vector_idx] = LJMP_OPCODE;
_fifo_gpif_autovector[vector_idx + 1] = addr >> 8;
_fifo_gpif_autovector[vector_idx + 2] = addr & 0xff;
EA = t;
}
/* end */
Comments?
Michele
On 27/11/2007, Michele Bavaro <[EMAIL PROTECTED] > wrote:
>
> Dear all,
> I modified a little the firmware of a usrp-based device.
> I wanted to check the buffer overrun event on the BULK IN EP2 FIFO, but
> the interrupt autovectoring mechanism doesn't work.
> The following code
>
>
> static void
> isr_EP2FULLFLAG (void) interrupt
> {
> clear_fifo_gpif_irq ();
>
> IOD ^= 0x01;
>
> _usb_rx_overrun++;
> }
>
> void install_handlers (void)
> {
> setup_descriptors (); // ensure that they're set before use
>
> hook_uv (UV_SUDAV, (WORD) isr_SUDAV);
> hook_uv (UV_USBRESET, (WORD) isr_USBRESET);
> hook_uv (UV_HIGHSPEED, (WORD) isr_HIGHSPEED);
>
> hook_fgv (FGV_EP2FF, (WORD) isr_EP2FULLFLAG);
>
> SYNCDELAY; EP2FIFOIE = 0x01; /* The FF on the EP2, which is BULK IN */
> SYNCDELAY;
> USBIE = bmSUDAV | bmURES | bmHSGRANT;
> }
>
>
> I don't see any changes in the port D bit 0 or _usb_rx_overrun variable,
> even in case of the EP2 overrun, which I can less efficiently verify with
> EP2468STAT or EP24FIFOFLGS (and maybe EP2CS as well).
> Any clue? Did someone ever try hook_fgv?
>
> Regards,
> Mic
>
>
>
>
>
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