programming is now abaout as fast as a parallel cable again
authormichael <michael>
Tue, 1 May 2007 13:03:39 +0000 (13:03 +0000)
committermichael <michael>
Tue, 1 May 2007 13:03:39 +0000 (13:03 +0000)
jtagkey.c

index fc762d368d211604cb0cb53ec6cdd2fca5ac775a..ffae2fa1a99898f997114ce1e3da666500c43a93 100644 (file)
--- a/jtagkey.c
+++ b/jtagkey.c
@@ -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);
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