Case:
Establishing connection between AVR Studio 4.14RC1, 4.15 or /4.16 (on Windows XP Pro SP2) and ATmega162 on AVR-P40-USB via AVR-JTAG-USB.
Connection scheme:
PC (host) ↔ AVR-JTAG-USB ↔ AVR-P40-USB ↔ PC (host)
where both devices are connected to the PC with USB-A/USB-B cables and are respectively interconnected with JTAG 10-wire cable.
Considerations:
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pins 4 and 7 of on-board JTAG connector ARE connected to Vcc (4.97V according to my last measurement);
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JTAG cable is checked pin-by-pin for wire breaches and proper connection (respectively with the board and with JTAG dongle);
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uC external reset upon JTAG connection is turned ON in AVR Studio, in case JTAGEN fuse is not enabled (which is not the case with my brand new uCs);
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Restarting the JTAG dongle doesn’t fix anything;
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AVR Studio successfuly connects to the JTAG dongle, but the problem seems to be (according to AVR Studio) connection between the board and the dongle;
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Just in case - both virtual RS-232 ports are mapped respectively to COM1 and COM2 (w/o any conflict with other virtual or real serial ports).
I’ll appreciate some useful thoughts, thus there is a lapse in mine already…