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STM32F303 Production Programming

Question asked by GeorgeP on May 4, 2015
Latest reply on May 5, 2015 by GeorgeP
I have a custom board with STM32F303CCT6, firmware generated by CubeMX, compiled on IAR 7.4.
Everything runs correctly in debug mode, when attached on Segger JLink and IAR.
When I disconnect the debugger and power reset the board, it doesn't reboot, it just stays idle.
I have also programmed it with J-Flash (.bin and .hex) on 0x800 0000 and it still stays idle. 
BOOT0 is low and NRESET is high. The MCU is powered externally (not from jLink) with 3V3.
Any ideas on what I should check are greatly appreciated.