Arm Development Studio forum swdp opearation in cortex-M3 /cortex-M0

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swdp opearation in cortex-M3 /cortex-M0

Note: This was originally posted on 21st April 2010 at http://forums.arm.com

we are working on a project to implement swjtag debugger for cortex boards. we had the reference manuals for cortex swdp, core sight, etc available at infocenter.arm.com

we are trying it accordingly. we were able to generate the switching sequences, packets etc properly as per the information we have but we couldn't get any acknowledgment packets from the processor. we are sure that we are missing some timing/other details . we will be thankful if you can help us in getting the complete timing sequence from power-on of the processor to ID code read in SWDP mode.that means to change the processor mode to swdp mode and requesting ID CODE read..

we are using our own compiled version of openocd software as debug software, we are generated the sequences using this software and verified this sequence from FT2232H to cortex processor using logic analyzer. We are generating the sequences perfectly as given in the reference manual of cortex.