On Thu, Jun 9, 2011 at 11:46 PM, Andreas Fritiofson <andreas.fritiof...@gmail.com> wrote: > Setting the FTDI pins to Hi-Z is not necessarily the same as setting the > pins in the JTAG connector to Hi-Z. There is arbitrary dongle-specific > interface logic between the FTDI chip and the connector.
Not true. Good example here can be KT-LINK SWD+JTAG buffers [1] configuration designed by Krzyszfot Kajstura - all signals can be electrically disconnected from target and they are in default configuration (after powerup). This is really nice design, also the first open SWD+JTAG for FT2232H chip. Interface can also offer additional signals such as various resets and control that also should be disconnected, especially for other transports. Upcoming SWD framework make use of existing ft2232 code, also the ft2232_quit() function, so there is a default possible behavior common to all ft*232-based devices. Thats not that complicated, isn't it? [1] http://sourceforge.net/apps/mediawiki/stm32primer2swd/index.php?title=File:Ktlink-buffers.png Best regards, Tomek -- CeDeROM, SQ7MHZ, http://www.tomek.cedro.info _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
