jackcartersmith/xilinx-usb-driver
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increase programming speed by a factor of 4.

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it now takes 5 seconds to program a xc3s400, which is the same time it
takes to program this chip with a parallel cable.
This commit is contained in:
michael 2007-04-29 15:57:34 +00:00
parent 3e670223fd
commit 4af4753dc4
1 changed files with 20 additions and 17 deletions
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37
jtagkey.c
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@ -3,9 +3,10 @@
#include "usb-driver.h"
#include "jtagkey.h"
#define USBBUFSIZE 384
#define USBBUFSIZE 4096
static struct ftdi_context ftdic;
static unsigned int usb_maxlen = 0;
int jtagkey_init(unsigned short vid, unsigned short pid) {
int ret = 0;
@ -31,12 +32,11 @@ int jtagkey_init(unsigned short vid, unsigned short pid) {
return ret;
}
#if 0
if ((ret = ftdi_write_data_set_chunksize(&ftdic, 1)) != 0) {
fprintf(stderr, "unable to set write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
if ((ret = ftdi_write_data_get_chunksize(&ftdic, &usb_maxlen)) != 0) {
fprintf(stderr, "unable to get write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
return ret;
}
#endif
if ((ret = ftdi_set_latency_timer(&ftdic, 1)) != 0) {
fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
@ -51,7 +51,7 @@ int jtagkey_init(unsigned short vid, unsigned short pid) {
c = 0x00;
ftdi_write_data(&ftdic, &c, 1);
if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, BITMODE_SYNCBB)) != 0) {
if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, BITMODE_BITBANG)) != 0) {
fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
return ret;
}
@ -110,14 +110,21 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
/* Write combining */
if ((writepos-writebuf > sizeof(writebuf)-num) || (nread && writepos-writebuf)) {
unsigned char *pos = writebuf;
int len;
DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
len = writepos-pos;
i = 0;
while (i < writepos-writebuf) {
i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
while (pos < writepos) {
if (len > usb_maxlen)
len = usb_maxlen;
DPRINTF("combined write of %d/%d\n",len,writepos-pos);
ftdi_write_data(&ftdic, pos, len);
pos += len;
}
DPRINTF("read %d/%d bytes\n", i, writepos-writebuf);
writepos = writebuf;
}
@ -200,14 +207,10 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
if (nread)
{
DPRINTF("writing %d bytes\n", writepos-writebuf);
ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
DPRINTF("reading %d bytes\n", writepos-writebuf);
i = 0;
while (i < writepos-writebuf) {
i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
for (i=0; i<writepos-writebuf; i++) {
ftdi_write_data(&ftdic, writebuf+i, 1);
ftdi_read_pins(&ftdic, readbuf+i);
}
DPRINTF("read %d bytes\n", i);
#ifdef DEBUG
DPRINTF("write: ");