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why STM32F407 descovery flashed software takes effect after replugging the cable

I am using Keil to flash the software to my stm32f407 discovery. But the software only starts working when i pullout the JLINK cable and plug it again. Why is that? Thanks.

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Andy Neil over 4 years ago in reply to rocko874 +1 verified

rocko874 said: they say that its about the index variable being local you've missed the point. Did you follow the link I gave? The compiler sees your loop as totally pointless, so is perfectly entitled...
Robert McNamara over 4 years ago in reply to rocko874 +1

The compiler will not optimize out __NOP() intrinsic instructions. Change your loop from for(uint32_t i=0;i<500000;i++){} To for(uint32_t i=0;i<500000;i++) { __NOP(); }

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0 Robert McNamara over 4 years ago in reply to rocko874

The compiler will not optimize out __NOP() intrinsic instructions.

Change your loop from

for(uint32_t i=0;i<500000;i++){}

To

for(uint32_t i=0;i<500000;i++) { __NOP(); }
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0 Robert McNamara over 4 years ago in reply to rocko874

The compiler will not optimize out __NOP() intrinsic instructions.

Change your loop from

for(uint32_t i=0;i<500000;i++){}

To

for(uint32_t i=0;i<500000;i++) { __NOP(); }
Cancel
Vote up +1 Vote down

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