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Run problem on the Corstone SSE-300 (MPS3) simulator

Hi,

Could someone tell me, please, what could be the issue if everything works on the -O3 optimization, but on the -O0 it stops working at the entrance to the "main()" function (freeze)?

Thanks.

Top replies

Ronan Synnott over 3 years ago +1 suggested

Yevgeny, suffice to say that this should not happen in any case, but is even more unlikely that it works with full optimization, but not with minimal optimization. Without seeing the code, it is hard...
Ronan Synnott over 3 years ago in reply to Yevgenyy +1 suggested

Hi again, I see you are using the CMSIS pack scatter files - I understand better now. Are you using MDK to build your example, or a makefile or siimilar? I built the 'Blinky' example at -O0 and -O3 without...

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0 Ronan Synnott over 3 years ago in reply to Yevgenyy

My apologies - I copied an incorrect version, try this:

#define CM_DEMCR               (*((volatile uint32_t*)0xE000EDFC))
#define CM_TRCENA_BIT          (1UL<<24)

#define CM_DWT_LAR             (*((volatile uint32_t*)0xE0001FB0))

#define CM_DWT_CONTROL         (*((volatile uint32_t*)0xE0001000))
#define CM_DWT_CYCCNTENA_BIT   (1UL<<0)

#define CM_DWT_CYCCNT          (*((volatile uint32_t*)0xE0001004))

void start_cyccnt()
{
    CM_DEMCR |= CM_TRCENA_BIT;
    CM_DWT_LAR = 0xC5ACCE55;
    CM_DWT_CONTROL |= CM_DWT_CYCCNTENA_BIT; 
    CM_DWT_CYCCNT = 0;

}
void stop_cyccnt()
{
    CM_DWT_CONTROL &= ~CM_DWT_CYCCNTENA_BIT;
}

I tested the attached with Arm Development Studio 2021.1, and it works well.

this is a function that does something
Function took 3131 cycles

m55_cyclecount.zip

Reply

0 Ronan Synnott over 3 years ago in reply to Yevgenyy

My apologies - I copied an incorrect version, try this:

#define CM_DEMCR               (*((volatile uint32_t*)0xE000EDFC))
#define CM_TRCENA_BIT          (1UL<<24)

#define CM_DWT_LAR             (*((volatile uint32_t*)0xE0001FB0))

#define CM_DWT_CONTROL         (*((volatile uint32_t*)0xE0001000))
#define CM_DWT_CYCCNTENA_BIT   (1UL<<0)

#define CM_DWT_CYCCNT          (*((volatile uint32_t*)0xE0001004))

void start_cyccnt()
{
    CM_DEMCR |= CM_TRCENA_BIT;
    CM_DWT_LAR = 0xC5ACCE55;
    CM_DWT_CONTROL |= CM_DWT_CYCCNTENA_BIT; 
    CM_DWT_CYCCNT = 0;

}
void stop_cyccnt()
{
    CM_DWT_CONTROL &= ~CM_DWT_CYCCNTENA_BIT;
}

I tested the attached with Arm Development Studio 2021.1, and it works well.

this is a function that does something
Function took 3131 cycles

m55_cyclecount.zip

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