From: michael <michael>
Date: Sun, 29 Apr 2007 18:48:10 +0000 (+0000)
Subject: some more performance improvements
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/usb-driver/commitdiff_plain/3f5287b7f725b0e90b8a29b4ed3e16cfdc8d6fbe?ds=sidebyside;hp=a270f1e37a49ae072740de471bfe98658dea3b5e

some more performance improvements
---

diff --git a/jtagkey.c b/jtagkey.c
index bf1cded..04cfb4c 100644
--- a/jtagkey.c
+++ b/jtagkey.c
@@ -208,10 +208,35 @@ int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase,
 	{
 		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);
+
+			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);
+			}
 		}
 
 #ifdef DEBUG