6 Replies Latest reply on May 9, 2017 10:20 AM by pamic_1947496

    Development Environment Setup - DAP Device Not found



      I am trying to set up Keil uVision to start developing on my kit. However whenever I try to download to board, or start a debug session I get a pop up saying that "No Debug Unit Device Found". 




      I'm using Windows 10 in VMware Fusion


      I have installed all the drivers listed here:




      I can successfully run the test code which was pre-loaded on the board and know that my device is plugged in and recognized by windows as it shows up as COM4.


      I have also made sure that the DAP firmware is updated (v2.5) and in Keil I have set the Debugger and Utilities up as CMSIS-DAP. 


      I have attempted to load my program using the output .hex file and the Direct USB method however it keeps Timing Out - with J2 shorted as per the instructions in the quick start guide.




      I'm pretty sure I have just done something basic wrong - any pointers would be helpful. 


      Thanks very much.

        • 1. Re: Development Environment Setup - DAP Device Not found



          Is the CMSIS-DAP also shown in the Windwos "devices and printers" page?




          With USB-Direct programmer you are using the built-in bootloader to flash the MCU. To enter the bootloader you have to close the jumpers J2 and set jumper J3 to 2-3 (input select to USB). Board has to be plugged in using the other USB connector (CN3) and a device called USBVCOM should be shown in Windows. Powercycle or reset might be needed. Probably also change J4 to select the other USB port as power source.




          I guess one of the bold is wrong.

          • 2. Re: Development Environment Setup - DAP Device Not found

            Thanks for the help, so now I have the jumpers as follows:


            J2 closed, J3 2-3, J4 2-3, and USB plugged in via CN3. USBVCOM shows up in the device manager. 



            However I still get the following error when I enter debug mode on Keil.



            My Keil project settings are as follows:




            And when I go on the CMSIS-DAP settings I see the following:





            I then tried to use both the MCU and USB Direct tools to flash my .hex file but they failed to open the COM port (I set this to 4 as that's what it was before when I was using CN2 to connect).


            Sorry for the probably stupid questions!






            • 3. Re: Development Environment Setup - DAP Device Not found



              For debugging with Keil, you have to keep J2 open, J4 1-2 (power select) and connect the board via CMSIS DAP Connector (CN2).


              If J2 is closed the MCU enters the internal bootloader and you can't flash/debug it from Keil. J2 open is normal operation.




              USB Direct: Uses the internal bootloader and is basically used for flashing during production or recovering the MCU.


              In your case COM4 for the USBVCOM is most likely not correct, because it is a different device COM4 is your debugger, COM5 (I guess) your MCUs bootloader. Properties of USBVCOM should show the correct number.

              • 4. Re: Development Environment Setup - DAP Device Not found

                Thank you for clarifying the difference between using the bootloader methods of loading code on. Since I am trying to develop using PDL  to learn more about the device I need to use Keil to load and debug my code.


                The current state of the jumpers is: J1 = Open, J2 = Open. J4 = 1-2. J3 = 2-3 (though I have tried 1-2 as well with no luck!), and I connect using CN2. The device appears in Device Manager however the same error messages appear in Keil when I go to debug or load code onto my development board.



                • 5. Re: Development Environment Setup - DAP Device Not found

                  Just to test if it is the CMSIS-DAP/driver or USB-passthrough of the VM, causing the problem. Can you install the J-Link OB firmware on the onboard debugger?






                  After the firmware update, use the default jumper settings and after connecting the device there should be a J-Link connected to the PC.


                  You have to select J-Link as debugger in the Keil Project settings. And then please try to debug the MCU again.

                  • 6. Re: Development Environment Setup - DAP Device Not found

                    Thank you for the help - I have sorted the issue. I was running in a VM and for some reason although the CMSIS-DAP device was showing in device manager the communication to it wasn't great. The solution was to install Windows 10 on a partition and it works fine through there. Thanks for all your help in this matter.