- disabled JTAG debug output

[openocd.git] / src / jtag / bitbang.c

diff --git a/src/jtag/bitbang.c b/src/jtag/bitbang.c
index 3d49d186dd4603081562976c575fd0aab517700b..2065f62ab07439aa6b6074101a1d535343a00fe1 100644 (file)
--- a/src/jtag/bitbang.c
+++ b/src/jtag/bitbang.c
@@ -142,7 +142,11 @@ void bitbang_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size)
 
        for (bit_cnt = 0; bit_cnt < scan_size; bit_cnt++)
        {
-               if ((buffer[bit_cnt/8] >> (bit_cnt % 8)) & 0x1) {
+               /* if we're just reading the scan, but don't care about the output
+                * default to outputting 'low', this also makes valgrind traces more readable,
+                * as it removes the dependency on an uninitialised value
+                */ 
+               if ((type != SCAN_IN) && ((buffer[bit_cnt/8] >> (bit_cnt % 8)) & 0x1)) {
                        bitbang_interface->write(0, (bit_cnt==scan_size-1) ? 1 : 0, 1);
                        bitbang_interface->write(1, (bit_cnt==scan_size-1) ? 1 : 0, 1);
                } else {