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63f4e7c72a
The current cJTAG to JTAG switching commands for TI chips are not particularly reliable, especially on chips with accurate timing. On a Raspberry Pi the existing sequence has (depending on cabling and chip) a ~50% chance of working, on a much better-behaved FT2232H it doesn't manage to enable full JTAG at all. This change runs a bunch of test-idle cycles before actually attempting to switch to full JTAG. This makes the switch reliable even at high clock speeds (>100kHz) and from precise sources like the FT2232H. Change-Id: I9293e884bf3e9606d529756ae4483b844d3c39db Reported-by: Phil Wiggum <p1mail2015@mail.com> Fixes: https://sourceforge.net/p/openocd/tickets/375/ Signed-off-by: Lorenz Brun <lorenz@brun.one> Reviewed-on: https://review.openocd.org/c/openocd/+/7419 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
36 lines
1.4 KiB
INI
36 lines
1.4 KiB
INI
# SPDX-License-Identifier: GPL-2.0-or-later
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# A start sequence to change from cJTAG to 4-pin JTAG
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# This is needed for CC2538 and CC26xx to be able to communicate through JTAG
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# Read section 6.3 in http://www.ti.com/lit/pdf/swru319 for more information.
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proc ti_cjtag_to_4pin_jtag {jrc} {
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# Bypass
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runtest 20
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irscan $jrc 0x3f -endstate RUN/IDLE
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# Two zero bit scans and a one bit drshift
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pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
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pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
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pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
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pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
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# A two bit drhift and a 9 bit drshift
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pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
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pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRPAUSE
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pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
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pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
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# Bypass
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irscan $jrc 0x3f -endstate RUN/IDLE
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# Set ICEPick IDCODE in data register
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irscan $jrc 0x04 -endstate RUN/IDLE
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}
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