2013-05-16 04:51 AM
I would like to program my stm32 discovery board via st-link, to do this i am trying to power my board externally by using 5V pin. However, when i powered the board, ld1 com turns red, but it blinks. In this case, the program loaded in board runs, but i am not able to connect to it via st link; it gives an error that 'no target connected'. Do you have an idea about the problem here?
#which-discovery-board?2013-05-16 05:07 AM
Which Discovery board? ST makes about half a dozen different ones.
If you think it is the supply, use 5V from a bench supply, the USB supply has limited current available. Consider if you need to play with the SB (solder bridges), and the connectivity of RESET to your target device. Consider if the code on your target breaks SWD/JTAG connectivity by changing pin configurations, loops with SWI, or does DMA early in the start up process.2013-05-16 05:26 AM
2013-05-16 05:26 AM
2015-01-30 05:13 AM
Hello I have the same problem and i cant fix it!! there is no info on web. if somebody have any information please tell me. thank you very much!!!
2015-01-30 06:57 AM
Hello I have the same problem and i cant fix it!! there is no info on web. if somebody have any information please tell me. thank you very much!!!
Ok, but you haven't really contributed any information either. Did the board work at one time? What did you do immediately before the board failed? Have you reviewed the circuit diagram and looked at any voltages/signals on the board? What board do you have, and what have you connected to it?2015-07-06 12:29 AM
Hello,
I have a similar problem with my STM32L053-Discovery Board. If I connect the board via USB with my PC it works fine, but if I power supply the STM32L053 without my PC (battery), the LD1 (COM) starting to blink. I have connected the USB on the USB ST-Link connector. Thanks2016-03-10 05:44 PM
2016-03-10 07:10 PM
Did anyone find the solution for this...
Well that would require someone with these issues and motivation to actually do some analysis. My guess would be that the ST-LINK firmware blinks the LED because it is powered, but has no USB connectivity. Does this actually have any deleterious effect? If not, who cares? If the ST-LINK does something weird in this condition, disconnect it from the target CPU at the SWD and NRST interfaces.2016-03-10 10:03 PM
Though it is not causing any error and the program executes fine.
I like your comment ''WHO CARES'' .......