Value corruption

[Jibin]

Static volatile global variable updated in systick handler gives garbage values on startup despite being initialized to 0. Is this memory corruption?

[haakonsh]

Hey Jibin,

Can you share the code relevant to the initialization of the variable?

Cheers,

Håkon.

[Jibin]

Hey,

**********************************

uint32_t returnCode;

static volatile uint32_t msTicks = 0;

void SysTick_Handler(void)  
{
                msTicks++;
}

//in main fn

returnCode = SysTick_Config(SystemCoreClock / 1000);               

if(returnCode!=0)
{
                        printf("syserr\r\n");
}              

************************************

It seems msTicks value shoots up very quickly.

Thanks,

Jibin

[haakonsh]

What SDK are you using? I can't find any reference to 'SysTick_Config'

My guess is that you are expecting the SysTick_Handler to be called every millisecond, when in fact it is called every 1/(64MHz/1000) = 15.6 µs.