On Fri, 13 Mar 2009, Rick Altherr wrote: > On Mar 13, 2009, at 2:47 PM, Peter Denison wrote: >> There are also adapters (at least one - USBprog) that rely on the fact that >> there are exactly 7 state transitions in every tms sequence. This is not >> immutable, but it will need coordination and will have to change if OpenOCD >> does. > > Does the adapter actually depend on the 7 state transitions or does the > driver for that adapter in OpenOCD rely on that. If the former, we have a > problem. If the latter, it just means we need to be sure to update the > driver. As far as I have been able to discern, every single adapter OpenOCD > supports is just fed a stream of bytes indicating the pin states for the next > cycle.
The USBprog adapter firmware depends on doing things in 7-cycle groups. However, it is open-source firmware, so we can change it, but it will just need a load more coordination. >From what you've said, it sounds like it's the only one that is like that. I strongly suspect that the adapter firmware was written with detailed internal knowledge of OpenOCD, and that at that stage 7 clocks for each transition fitted nicely. P.S. Any chance of looking at the USBprog/JLink patch, at https://lists.berlios.de/pipermail/openocd-development/2009-March/004957.html _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
