jackcartersmith/xilinx-usb-driver
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use the right tool for the job!

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use BITMODE_BITBANG for bulk transfers and BITMODE_BBSYNC for transfers with
interleaved reads
This commit is contained in:
michael 2007-04-29 21:32:59 +00:00
parent 3f5287b7f7
commit 9640dec9c7
1 changed files with 34 additions and 29 deletions
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63
jtagkey.c
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@ -1,5 +1,6 @@
#include <stdio.h>
#include <ftdi.h>
#include <unistd.h>
#include "usb-driver.h"
#include "jtagkey.h"
@ -7,6 +8,7 @@
static struct ftdi_context ftdic;
static unsigned int usb_maxlen = 0;
static unsigned char bitbang_mode;
int jtagkey_init(unsigned short vid, unsigned short pid) {
int ret = 0;
@ -56,6 +58,8 @@ int jtagkey_init(unsigned short vid, unsigned short pid) {
return ret;
}
bitbang_mode = BITMODE_BITBANG;
if ((ret = ftdi_usb_purge_buffers(&ftdic)) != 0) {
fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
return ret;
@ -70,6 +74,30 @@ void jtagkey_close() {
ftdi_deinit(&ftdic);
}
static int jtagkey_set_bbmode(unsigned char mode) {
int ret = 0;
if (bitbang_mode != mode) {
DPRINTF("switching bitbang-mode!\n");
/* Wait for the latency-timer to kick in */
usleep(2);
if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, mode)) != 0) {
fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
return ret;
}
if ((ret = ftdi_usb_purge_buffers(&ftdic)) != 0) {
fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
return ret;
}
/* Wait for the FTDI2232 to settle */
usleep(2);
bitbang_mode = mode;
}
return ret;
}
void jtagkey_state(unsigned char data) {
fprintf(stderr,"Pins high: ");
@ -114,6 +142,7 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
int len;
DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
jtagkey_set_bbmode(BITMODE_BITBANG);
while (pos < writepos) {
len = writepos-pos;
@ -207,36 +236,12 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
if (nread)
{
DPRINTF("writing %d bytes\n", writepos-writebuf);
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);
jtagkey_set_bbmode(BITMODE_SYNCBB);
ftdi_write_data(&ftdic, writebuf, 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);
if (i > 0 && tr[i].cmdTrans == PP_WRITE && tr[i-1].cmdTrans == PP_READ)
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);
}
i = 0;
while (i < writepos-writebuf) {
i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
}
#ifdef DEBUG