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Hi I have been working with ST-Link V2 programmer to program STM32L1 discovery board. after a month or so yesterday I faces a problem I get error when trying to download the flash: "Flash download failed-Target dll has been canceled" in tools in debug window I see this "No Cortex-M SW Device Found" Max clock is on 1MHz. Any one knows what the problem is!! Could it be related to the software license? cause I used another ST-LINK V2 and the problem exists.
Dear Westonsupermare, I did not use any of PA13 and PA14 pins. I had another STM32L discovery board of same type I programmed it with another firmware and saw that it is no longer able to be programmed. how ever they work properly by their last firmware now. the ST-LINK programmer is okay since I can program Discovery board for STM32f103RE. Is there any way to make my faulty boards back to their early state? I remember in AVR I had same problem when fusebits set by fault so I need to give an external clock! But I don't know is there some way like that?
You can link/jumper the BOOT(BOOT0) pin and VDD (3V), and restart the board, in this state it won't be running any of your code, and you should be able to erase it.
Thank you very much for your help! I did what you said and the problem solved. Many many thanks.