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Factoring of jtag_examine_chain for maintainability: 

- Factor JTAG chain examination into static helper function.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2083 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
zwelch 2009-06-07 05:23:03 +00:00
parent 861f52ff16
commit 90dbfcea7d
1 changed files with 18 additions and 17 deletions
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35
src/jtag/jtag.c
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@ -946,12 +946,28 @@ void jtag_sleep(u32 us)
#define EXTRACT_PART(X) (((X) & 0xffff000) >> 12)
#define EXTRACT_VER(X) (((X) & 0xf0000000) >> 28)
static int jtag_examine_chain_execute(u8 *idcode_buffer, unsigned num_idcode)
{
scan_field_t field = {
.tap = NULL,
.num_bits = num_idcode * 32,
.out_value = idcode_buffer,
.in_value = idcode_buffer,
};
// initialize to the end of chain ID value
for (unsigned i = 0; i < JTAG_MAX_CHAIN_SIZE; i++)
buf_set_u32(idcode_buffer, i * 32, 32, 0x000000FF);
jtag_add_plain_dr_scan(1, &field, TAP_RESET);
return jtag_execute_queue();
}
/* Try to examine chain layout according to IEEE 1149.1 §12
*/
static int jtag_examine_chain(void)
{
jtag_tap_t *tap;
scan_field_t field;
u8 idcode_buffer[JTAG_MAX_CHAIN_SIZE * 4];
int i;
int bit_count;
@ -959,22 +975,7 @@ static int jtag_examine_chain(void)
u8 zero_check = 0x0;
u8 one_check = 0xff;
field.tap = NULL;
field.num_bits = sizeof(idcode_buffer) * 8;
field.out_value = idcode_buffer;
field.in_value = idcode_buffer;
for (i = 0; i < JTAG_MAX_CHAIN_SIZE; i++)
{
buf_set_u32(idcode_buffer, i * 32, 32, 0x000000FF);
}
jtag_add_plain_dr_scan(1, &field, TAP_RESET);
jtag_execute_queue();
jtag_examine_chain_execute(idcode_buffer, JTAG_MAX_CHAIN_SIZE);
for (i = 0; i < JTAG_MAX_CHAIN_SIZE * 4; i++)
{