With Paul's help, I wiggled the SRST line from the console. It's showing low
pretty much no matter what I do.
The SWD lines are pulled up to 3.3V (the same supply that powers the processor)
by 100K resistors. That strikes me as an awfully high value. Too much? Should I
try lowering it, to, say, 4.7K?
From: Tomas Vanek [mailto:[email protected]]
Sent: Friday, February 23, 2018 4:38 PM
To: Jay Maynard <[email protected]>
Cc: [email protected]
Subject: Re: [OpenOCD-devel] Atmel ATSAME70 examination incomplete at startup
I connected my custom SAME70 board to a FT2232 based adapter just to make sure
that current git master works.
It does. See attached log in -d4 level as you used.
There must be some electrical problem in SWD signals, grounding or supply.
Tom
On 23.02.2018 23:06, Jay Maynard wrote:
Apologies for the triple post. Can I drop an anvil on Sourceforge now?
Anyway, a couple of updates since that was written:
1. I tried setting the bits in the write command to 0. Didn't change the
result.
2. A scope on the SWD data line shows nice clean square waves for the
signal, so that much is good electrically, at least.
I have a debug log from someone using a SAME70 Xplained development board, but
it uses the CMSIS-DAP debugger interface. I'd prefer not to buy another
debugger dongle, but I will if I have to. One weisenheimer suggested I get an
Atmel-ICE while it's on sale for 50% off ($65 for the kit). Anyone out there
using a SAME70 that's *not* on the Xplained board?
From: Jay Maynard [mailto:[email protected]]
Sent: Friday, February 23, 2018 3:28 PM
To:
[email protected]<mailto:[email protected]>
Subject: [OpenOCD-devel] Atmel ATSAME70 examination incomplete at startup
I'm trying to get an Atmel ATSAME70Q20A working with OpenOCD. I have an Olimex
JTAG-TINY and ARM-JTAG-SWD connected, and the system works with our previous
board running an AT91SAM7X. This is a new board design, so there may be a
hardware issue. I've tried both the 0.10.0 distribution release and the tip of
the git repository tree built today (from the Czech mirror, since Sourceforge
seems not to have git access running yet).
The results vary some between runs. Sometimes, it doesn't power up the debug
domain (see https://pastebin.com/NHXavQQL for an example). Other times, it gets
the debug domain powered up, but can't find the AHB-AP (see
https://pastebin.com/X4XeFdam ). Still others, it finds the AHB-AP, but then
gets a fault trying to write to it (see https://pastebin.com/KQtpF537 ). The
last case, at least, seems to have a problem: two bits are being written as 1
to a register that the architecture defines as should be zero.
I've spent some time online on the IRC channel trying to get this running with
the help of some folks there, but no luck. They suggested I ask you folks. Any
ideas?
Jay Maynard | Software Engineer
Kahler Automation<http://www.kahlerautomation.com/> | 808 Timberlake Road,
Fairmont, MN 56031 | Main: 507-235-6648
[email protected]<mailto:[email protected]>
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