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Problem with EXTI4_15_IRQHandler when running after custom bootloader

Question asked by Eduard Furlender on Jul 28, 2017
Latest reply on Jul 31, 2017 by Eduard Furlender

Hello, I have a working program running on STM32F072R8 CPU that works with external device and gets data via external interrupt (EXTI4_15_IRQHandler function). The collected data is forwarded later via USB port to computer. Recently I started a modification in order to implement firmware update using custom boot-loader. I successfully implemented both boot-loader and main module based on the IAP sample project. The problem is that USB and timer IRQ still work, but the program gets no EXTI4_15_IRQHandler call anymore. Only if I run it with J-Link debugger, the program gets the external interrupt. Or if I revert the code to run from usual memory location (without boot-loader). How can I solve the problem?