while i was using cubemx to set peripherals of my stm32f407 arm core, just before generating code, i checked and selected the "set all free pins as analog (to optimize the power consumption)" dialog box in project settings-> code generator-> HAL settings, without masking the debug pins (swdio and swclk). After that, i downloaded a simple blinky code inside the microcontroller successfully using keil ide. but now when i want to use keil to erase or download a code, i see "no target connected" error in debug tab and i cant download any code. How can i solve this problem? Thanks for your helps.
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After about 10 hours searching, i found the solution. if someone had the same problem, here is the solution :
https://electronics.stackexchange.com/questions/204996/stm32-st-link-cannot-connect-to-mcu-after-successful-programming