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Pavel Chromy: TCK returns to zero before state of reset line is changed.

git-svn-id: svn://svn.berlios.de/openocd/trunk@703 b42882b7-edfa-0310-969c-e2dbd0fdcd60
tags/v0.1.0
oharboe 16 years ago
parent
commit
24092a5172
1 changed files with 21 additions and 6 deletions
  1. +21
    -6
      src/jtag/presto.c

+ 21
- 6
src/jtag/presto.c View File

@@ -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;


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