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-rw-r--r--src/jtag/jtag.c35
1 files changed, 18 insertions, 17 deletions
diff --git a/src/jtag/jtag.c b/src/jtag/jtag.c
index 292aa55a..a3d86ade 100644
--- a/src/jtag/jtag.c
+++ b/src/jtag/jtag.c
@@ -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++)
{