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Re: [avrdude-dev] Re: jtagmkII_close(): bad response to GO command: RSP_
From: |
Joerg Wunsch |
Subject: |
Re: [avrdude-dev] Re: jtagmkII_close(): bad response to GO command: RSP_ILLEGAL_EMULATOR_MODE |
Date: |
Fri, 20 Nov 2009 23:47:09 +0100 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
As Shaun Jackman wrote:
> My target is the AT90PWM316, which supports ISP and DebugWire, but
> not JTAG. I believe I'm operating in ISP mode and not DebugWire
> mode. Shouldn't this command be supported in this configuration?
No, ISP mode doesn't know a "GO" command, because it is not a
debugging mode. It asserts /RESET all the time anyway, and as soon as
you leave ISP mode, the target is supposed to start, as /RESET is
being deasserted.
In contrast, the debugging modi (JTAG or debugWIRE) can arbitrarily
stop and resume CPU operation; the latter is what CMND_GO is intended
for.
The attempt to send a CMND_GO command even in ISP mode is a benign bug
that slipped in somehow in one of the recent releases.
--
cheers, J"org .-.-. --... ...-- -.. . DL8DTL
http://www.sax.de/~joerg/ NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)