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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

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. ;-)

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