jackcartersmith/xilinx-usb-driver
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some more performance improvements

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This commit is contained in:
michael 2007-04-29 18:48:10 +00:00
parent a270f1e37a
commit 3f5287b7f7
1 changed files with 25 additions and 0 deletions
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jtagkey.c
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@ -208,10 +208,35 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
{ {
DPRINTF("writing %d bytes\n", writepos-writebuf); DPRINTF("writing %d bytes\n", writepos-writebuf);
for (i=0; i<writepos-writebuf; i++) { for (i=0; i<writepos-writebuf; i++) {
#if 1
int combine = i;
do {
if (combine > 0 &&
tr[combine-1].cmdTrans == PP_READ) {
break;
} else {
combine++;
}
} while (combine < writepos-writebuf);
DPRINTF("combined writes before read: %d\n", combine);
if ((combine-i)-1 > 0) {
ftdi_write_data(&ftdic, writebuf+i, (combine-i)-1);
i = combine-1;
}
#endif
ftdi_write_data(&ftdic, writebuf+i, 1); ftdi_write_data(&ftdic, writebuf+i, 1);
if (i > 0 && tr[i].cmdTrans == PP_WRITE && tr[i-1].cmdTrans == PP_READ) if (i > 0 && tr[i].cmdTrans == PP_WRITE && tr[i-1].cmdTrans == PP_READ)
ftdi_read_pins(&ftdic, readbuf+i); ftdi_read_pins(&ftdic, readbuf+i);
if (i == (writepos-writebuf)-1 && tr[i].cmdTrans == PP_READ) {
ftdi_write_data(&ftdic, writebuf+i, 1);
ftdi_read_pins(&ftdic, readbuf+i+1);
}
} }
#ifdef DEBUG #ifdef DEBUG