1. ) STM32F072C8T6 MCU based board. Initailly it was working fine & we were able to Program using Nucleo F302R8 as ST link & Debug in IDE. Later on during development MCU was not detectable. replaced it by a new MCU but problem persisted.
2.) We checked on different types of USB based ST link debuggers also. Then again changed MCU, its surrounding capcitors, bergstrip pins on programming port & 3.3 volt supply also recreated. These were already working fine. Cross checked for dry soldering also. all things on board were fine.
3.) Ultimately we put a new MCU with its surrounding capacitors on new board with no other components there. Then through ST Utility s/w hex file gets loaded into it, sometimes after pressing Reset button & sometimes without pressing it. It still remains un detectable by IAR or Atollic.
Kindly help & suggest what can be done for the cause of MCU not getting detected for programming.
