I am using ULinkPro Debugger to program and debug software on NXP LPC4088FBD144 MCU.
While downloading program in debug mode, I am getting following error message "Cannot access memory" and "Cannot enter Debug Mode". Downloading program on MCU is not possible.
I tried changing Max Clock frequency (all values of frequency) in Target Driver Setup - Debug - Settings to solve the problem. Problem not solved.
Please suggest a suitable solution to the problem.
Thank you for your reply to my post.
I am using custom designed board. However, after experimenting with uVision Keil v5.14, I have observed said errors disappear.
After setting, Options for Target 1 -> Debug -> Settings -> Debug (Cortex-M Target Driver Setup) -> Connect and Reset Options -> With Pre-Reset said problems disappear.
Please suggest reason for disappearance of error under above mentioned setting.
Figure out what your board does wrong. Compare with a working board.
I saw the same error on a Cortex-M0 target last night, after the FW was updated in my Segger J-Link Plus. I will try your fix; if it works there is something recently wrong with their update. (I used it without issue on 9/21/16 last). Thank you.
Please update me about your observations and obtained results. I want to understand root-cause of the problem, so that finding solution to the problem becomes systematic and deterministic.
Sunil, it turns out it was a mistake on my end. I didn't have a proper power supply to the DUT and the current demands on reflash operations was browning out the CPU. I don't know if that will help you or not but at least it is something to check off your investigation list.
Best, Dan