Stuck in a loop in startup_stmf051x8.s file

[jim_jones188]

Posted on July 15, 2018 at 00:55

I can only run a few dozen lines of code until I get stuck in a loop. When trying to debug it appears I am stuck in the startup_stmf051x8.s file on these lines:

0x0800016E E7FE      B        PendSV_Handler (0x0800016E)   164:                 B       . 0x08000170 E7FE      B        SysTick_Handler (0x08000170)   230:                 B       .    231:     232:                 ENDP

If I try to step through it in the disassembly window it just jumps between line 164 and 232. I can't figure out what is going on.

#loop-startup-file #startup-file #loop

[Tesla DeLorean]

Posted on July 15, 2018 at 01:10

Suggests you're enabling an interrupt you don't have a real handler for. Perhaps something like the SysTick_Handler in stm32f0xx_it.c

Missing file? Using C++ or .cpp?

You're going to have to provide more context here.

[jim_jones188]

Posted on July 15, 2018 at 01:38

I am not familiar with stm32f0xx_it.c.

I am programming an STM32f051k8 through the onboard STlink on a STM32f072Discovery board using Keil UV5 using no C++, only C.

I do not have a SysTick_Handler, but adding one doesn't seem to solve the problem. I am not sure how SysTick gets enabled, it seems to be enabled by default.

I am enabling 4 interrupts, TIM1, TIM2, TIM3, and ADC1_COMP. Looks like my ADC1_COMP handler is missing. I added an empty handler, since that peripheral doesn't seem to have any interrupt flags, that also didn't solve the issue.

[henry.dick]

Posted on July 15, 2018 at 01:58

'

I can't figure out what is going on.'

it is not with those handlers but somewhere else. Unfortunately you haven't provide any info on that.