1 # SPDX-License-Identifier: GPL-2.0-or-later
3 # A start sequence to change from cJTAG to 4-pin JTAG
4 # This is needed for CC2538 and CC26xx to be able to communicate through JTAG
5 # Read section 6.3 in http://www.ti.com/lit/pdf/swru319 for more information.
6 proc ti_cjtag_to_4pin_jtag {jrc} {
9 irscan $jrc 0x3f -endstate RUN/IDLE
10 # Two zero bit scans and a one bit drshift
11 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
12 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
13 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
14 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
15 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
16 pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
17 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
19 # A two bit drhift and a 9 bit drshift
20 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
21 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
22 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
23 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
24 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
25 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
26 pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRPAUSE
27 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
28 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
31 irscan $jrc 0x3f -endstate RUN/IDLE
33 # Set ICEPick IDCODE in data register
34 irscan $jrc 0x04 -endstate RUN/IDLE