#include <stdio.h>
#include <ftdi.h>
+#include <unistd.h>
#include "usb-driver.h"
#include "jtagkey.h"
-#define USBBUFSIZE 384
+#define USBBUFSIZE 4096
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;
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));
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;
}
+ 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;
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: ");
/* 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);
+ jtagkey_set_bbmode(BITMODE_BITBANG);
+ while (pos < writepos) {
+ len = writepos-pos;
- i = 0;
- while (i < writepos-writebuf) {
- i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
+ 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;
}
if (nread)
{
DPRINTF("writing %d bytes\n", writepos-writebuf);
+ jtagkey_set_bbmode(BITMODE_SYNCBB);
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));
}
- DPRINTF("read %d bytes\n", i);
#ifdef DEBUG
DPRINTF("write: ");
}
readpos = readbuf;
- readpos += 0;
for (i = 0; i < num; i++) {
DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",