AnsweredAssumed Answered

Problem connecting with JTAG debugger

Question asked by fuentes.erick on Mar 13, 2012
Latest reply on Mar 16, 2012 by Simon. Lee
Hello,  I am having trouble connecting my j link debugger to a custom board that has an stm32f103rbt.  The error that I get is the following:

Could not measure total IR len. TDO is constant high.

Here is my hardware setup:
IAR J-Link ks H/W V5.20
20 pin connector - Signal Name - stm32 IO pin - pullup/down
3 - TRST - PB4 - pull up
5 - TDI - PA15 - pull up
7 - TMS - PA13 - pull up
9 - TCLK - PA14 - pull up
11 - RTCK - None - pull down
13 - TDO - PB3 - pull up
15 - RESET - NRST - pull up

I have verified using a scope that TDI and TCK oscillate, TDO, TRST and RESET all stay high when trying to connect.  Any help would be appreciated.

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