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Revert usb buffer code to reading uints from XUD as required for performance constraint. Handle some cases of tail to define data length.

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This commit is contained in:
Russell Gallop
2011-08-23 17:00:17 +01:00
parent b1a9b10e3c
commit de159ad6bf
1 changed files with 24 additions and 5 deletions
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29
module_usb_aud_shared/usb_buffer/usb_buffer.xc
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@@ -553,14 +553,33 @@ void buffer(register chanend c_aud_out, register chanend c_aud_in, chanend c_aud
{
xc_ptr p = iap_from_host_buffer + 4;
xc_ptr p0 = p;
int tail;
while (!testct(c_iap_from_host))
{
unsigned char datum = inuchar(c_iap_from_host);
write_byte_via_xc_ptr(p, datum);
p += 1;
unsigned int datum = inuint(c_iap_from_host);
write_via_xc_ptr(p, datum);
p += 4;
}
tail = inct(c_iap_from_host);
datalength = p - p0;// - 4;
switch (tail)
{
case 13:
// the tail is 3 which means
datalength -= 3;
break;
// case 10:
// // the tail is 0 which means
// datalength -= 6;
// break;
default:
// Case not handled before
printstrln("Tail case not handled (tail, datalength)");
printintln(tail);
printintln(datalength);
// the tail is 2 which means the input was word aligned
break;
}
(void) inct(c_iap_from_host);
datalength = p - p0 - 4;
}
XUD_SetNotReady(ep_iap_from_host);