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Factoring of jtag_examine_chain for maintainability: 

- Factor initial chain examination check into new static helper.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2084 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
zwelch 2009-06-07 05:23:13 +00:00
parent 90dbfcea7d
commit c318068839
1 changed files with 23 additions and 14 deletions
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37
src/jtag/jtag.c
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@ -963,32 +963,41 @@ static int jtag_examine_chain_execute(u8 *idcode_buffer, unsigned num_idcode)
return jtag_execute_queue();
}
static bool jtag_examine_chain_check(u8 *idcodes, unsigned count)
{
u8 zero_check = 0x0;
u8 one_check = 0xff;
for (unsigned i = 0; i < count * 4; i++)
{
zero_check |= idcodes[i];
one_check &= idcodes[i];
}
/* if there wasn't a single non-zero bit or if all bits were one,
* the scan is not valid */
if (zero_check == 0x00 || one_check == 0xff)
{
LOG_ERROR("JTAG communication failure: check connection, "
"JTAG interface, target power etc.");
return false;
}
return true;
}
/* Try to examine chain layout according to IEEE 1149.1 §12
*/
static int jtag_examine_chain(void)
{
jtag_tap_t *tap;
u8 idcode_buffer[JTAG_MAX_CHAIN_SIZE * 4];
int i;
int bit_count;
int device_count = 0;
u8 zero_check = 0x0;
u8 one_check = 0xff;
jtag_examine_chain_execute(idcode_buffer, JTAG_MAX_CHAIN_SIZE);
for (i = 0; i < JTAG_MAX_CHAIN_SIZE * 4; i++)
{
zero_check |= idcode_buffer[i];
one_check &= idcode_buffer[i];
}
/* if there wasn't a single non-zero bit or if all bits were one, the scan isn't valid */
if ((zero_check == 0x00) || (one_check == 0xff))
{
LOG_ERROR("JTAG communication failure, check connection, JTAG interface, target power etc.");
if (!jtag_examine_chain_check(idcode_buffer, JTAG_MAX_CHAIN_SIZE))
return ERROR_JTAG_INIT_FAILED;
}
/* point at the 1st tap */
tap = jtag_tap_next_enabled(NULL);