jackcartersmith/xilinx-usb-driver
Archived
1
0
Fork 0
Code Releases Activity

programming is now abaout as fast as a parallel cable again

Browse Source
This commit is contained in:
michael 2007-05-01 13:03:39 +00:00
parent c6338a01c2
commit f9318fa12d
1 changed files with 24 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
jtagkey.c
View File

@ -8,10 +8,27 @@
#define USBBUFSIZE 1048576
#define JTAG_SPEED 100000
#define SLOW_AND_SAFE 1
#define BULK_LATENCY 2
#define OTHER_LATENCY 1
static struct ftdi_context ftdic;
static unsigned char bitbang_mode;
static int jtagkey_latency(int latency) {
static int current = 0;
int ret;
if (current != latency) {
DPRINTF("switching latency\n");
if ((ret = ftdi_set_latency_timer(&ftdic, latency)) != 0) {
fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
return ret;
}
current = latency;
}
return ret;
}
static int jtagkey_init(unsigned short vid, unsigned short pid) {
int ret = 0;
@ -47,10 +64,8 @@ static int jtagkey_init(unsigned short vid, unsigned short pid) {
return ret;
}
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));
if ((ret = jtagkey_latency(OTHER_LATENCY)) != 0)
return ret;
}
c = 0x00;
ftdi_write_data(&ftdic, &c, 1);
@ -65,8 +80,6 @@ static int jtagkey_init(unsigned short vid, unsigned short pid) {
return ret;
}
bitbang_mode = BITMODE_SYNCBB;
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;
@ -94,33 +107,6 @@ void jtagkey_close(int handle) {
}
}
#ifndef SLOW_AND_SAFE
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;
}
#endif
void jtagkey_state(unsigned char data) {
fprintf(stderr,"Pins high: ");
@ -149,7 +135,6 @@ struct jtagkey_reader_arg {
static void *jtagkey_reader(void *thread_arg) {
struct jtagkey_reader_arg *arg = (struct jtagkey_reader_arg*)thread_arg;
int i;
i = 0;
@ -187,15 +172,12 @@ 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_latency(BULK_LATENCY);
#ifndef SLOW_AND_SAFE
jtagkey_set_bbmode(BITMODE_BITBANG);
#endif
#ifdef SLOW_AND_SAFE
targ.num = writepos-pos;
targ.buf = readbuf;
pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
#endif
while (pos < writepos) {
len = writepos-pos;
@ -206,9 +188,7 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
ftdi_write_data(&ftdic, pos, len);
pos += len;
}
#ifdef SLOW_AND_SAFE
pthread_join(reader_thread, NULL);
#endif
writepos = writebuf;
}
@ -297,9 +277,8 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
*writepos = last_data;
writepos++;
#ifndef SLOW_AND_SAFE
jtagkey_set_bbmode(BITMODE_SYNCBB);
#endif
jtagkey_latency(OTHER_LATENCY);
targ.num = writepos-writebuf;
targ.buf = readbuf;
pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);