jackcartersmith/xilinx-usb-driver
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improve performance by using threads

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This commit is contained in:
michael 2007-04-30 23:12:05 +00:00
parent 75417531f3
commit 3cc5a0bc5a
1 changed files with 50 additions and 23 deletions
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73
jtagkey.c
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@ -1,15 +1,15 @@
#include <stdio.h>
#include <ftdi.h>
#include <unistd.h>
#include <pthread.h>
#include "usb-driver.h"
#include "config.h"
#include "jtagkey.h"
#define USBBUFSIZE 4096
#define USBBUFSIZE 1048576
#define SLOW_AND_SAFE 1
static struct ftdi_context ftdic;
static unsigned int usb_maxlen = 0;
static unsigned char bitbang_mode;
static int jtagkey_init(unsigned short vid, unsigned short pid) {
@ -36,15 +36,15 @@ static int jtagkey_init(unsigned short vid, unsigned short pid) {
return ret;
}
#ifdef SLOW_AND_SAFE
usb_maxlen = 384;
#else
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));
if ((ret = ftdi_write_data_set_chunksize(&ftdic, USBBUFSIZE)) != 0) {
fprintf(stderr, "unable to set write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
return ret;
}
if ((ret = ftdi_read_data_set_chunksize(&ftdic, USBBUFSIZE)) != 0) {
fprintf(stderr, "unable to set read 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));
@ -93,6 +93,7 @@ void jtagkey_close(int handle) {
}
}
#ifndef SLOW_AND_SAFE
static int jtagkey_set_bbmode(unsigned char mode) {
int ret = 0;
@ -117,6 +118,7 @@ static int jtagkey_set_bbmode(unsigned char mode) {
return ret;
}
#endif
void jtagkey_state(unsigned char data) {
fprintf(stderr,"Pins high: ");
@ -139,6 +141,25 @@ void jtagkey_state(unsigned char data) {
fprintf(stderr,"\n");
}
struct jtagkey_reader_arg {
int num;
unsigned char *buf;
};
static void *jtagkey_reader(void *thread_arg) {
struct jtagkey_reader_arg *arg = (struct jtagkey_reader_arg*)thread_arg;
int i;
i = 0;
DPRINTF("reader for %d bytes\n", arg->num);
while (i < arg->num) {
i += ftdi_read_data(&ftdic, arg->buf + i, arg->num - i);
}
pthread_exit(NULL);
}
int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
int ret = 0;
int i;
@ -150,6 +171,8 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
static unsigned char readbuf[USBBUFSIZE], *readpos;
unsigned char data, prev_data;
struct jtagkey_reader_arg targ;
pthread_t reader_thread;
/* Count reads */
for (i = 0; i < num; i++)
@ -160,27 +183,30 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
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);
#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;
if (len > usb_maxlen)
len = usb_maxlen;
if (len > USBBUFSIZE)
len = USBBUFSIZE;
DPRINTF("combined write of %d/%d\n",len,writepos-pos);
ftdi_write_data(&ftdic, pos, len);
#ifdef SLOW_AND_SAFE
i = 0;
while (i < len) {
i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
}
#endif
pos += len;
}
#ifdef SLOW_AND_SAFE
pthread_join(reader_thread, NULL);
#endif
writepos = writebuf;
}
@ -256,7 +282,7 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
}
}
if (nread || (*writepos != prev_data))
if (nread || (*writepos != prev_data) || (i == num-1))
writepos++;
}
@ -267,13 +293,14 @@ 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
targ.num = writepos-writebuf;
targ.buf = readbuf;
pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
i = 0;
while (i < writepos-writebuf) {
i += ftdi_read_data(&ftdic, readbuf, sizeof(readbuf));
}
pthread_join(reader_thread, NULL);
#ifdef DEBUG
DPRINTF("write: ");