diff options
| -rw-r--r-- | src/jtag/presto.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/src/jtag/presto.c b/src/jtag/presto.c index c031d94b..3fd0ee12 100644 --- a/src/jtag/presto.c +++ b/src/jtag/presto.c @@ -573,10 +573,10 @@ int presto_bitq_out(int tms, int tdi, int tdo_req) if (presto->jtag_tck == 0) { - presto_sendbyte(0xA4); - presto->jtag_tck = 1; + presto_sendbyte(0xA4); /* jtag activity */ + presto->jtag_tck = 1; /* clock remains high after the function returns */ + /* do just a single tick first, accelerated shifting needs TCK=1 */ } - else if (!tdo_req && tms == presto->jtag_tms) { if (presto->jtag_tdi_count == 0) @@ -617,7 +617,7 @@ int presto_bitq_out(int tms, int tdi, int tdo_req) } if (tdo_req) - presto_sendbyte(0xD4 | cmdparam); + presto_sendbyte(0xD4|cmdparam); else presto_sendbyte(0xC4|cmdparam); @@ -634,8 +634,11 @@ int presto_bitq_flush(void) presto->jtag_tdi_count = 0; } - presto_sendbyte(0xCA); - presto->jtag_tck = 0; + if (presto->jtag_tck == 1) + { + presto_sendbyte(0xCA); + presto->jtag_tck = 0; + } presto_sendbyte(0xA0); @@ -664,6 +667,12 @@ int presto_bitq_sleep(unsigned long us) { long waits; + if (presto->jtag_tck == 1) + { + presto_sendbyte(0xCA); + presto->jtag_tck = 0; + } + if (us > 100000) { presto_bitq_flush(); @@ -683,6 +692,12 @@ int presto_bitq_reset(int trst, int srst) { unsigned char cmd; + if (presto->jtag_tck == 1) + { + presto_sendbyte(0xCA); + presto->jtag_tck = 0; + } + cmd = 0xE8; if (presto->jtag_tms) cmd |= 0x04; |